Adding upstream version 115.8.0esr.upstream/115.8.0esr

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

32 files changed, 13014 insertions, 0 deletions

diff --git a/third_party/rust/serde_with/src/base64.rs b/third_party/rust/serde_with/src/base64.rs
new file mode 100644
index 0000000000..e1c6490f44
--- /dev/null
+++ b/third_party/rust/serde_with/src/base64.rs
@@ -0,0 +1,205 @@
+//! De/Serialization of base64 encoded bytes
+//!
+//! This modules is only available when using the `base64` feature of the crate.
+//!
+//! Please check the documentation on the [`Base64`] type for details.
+
+use crate::{formats, DeserializeAs, SerializeAs};
+use alloc::{format, string::String, vec::Vec};
+use core::{
+    convert::{TryFrom, TryInto},
+    default::Default,
+    marker::PhantomData,
+};
+use serde::{de::Error, Deserialize, Deserializer, Serialize, Serializer};
+
+/// Serialize bytes with base64
+///
+/// The type serializes a sequence of bytes as a base64 string.
+/// It works on any type implementing `AsRef<[u8]>` for serialization and `TryFrom<Vec<u8>>` for deserialization.
+///
+/// The type allows customizing the character set and the padding behavior.
+/// The `CHARSET` is a type implementing [`CharacterSet`].
+/// `PADDING` specifies if serializing should emit padding.
+/// Deserialization always supports padded and unpadded formats.
+/// [`formats::Padded`] emits padding and [`formats::Unpadded`] leaves it off.
+///
+/// ```rust
+/// # #[cfg(feature = "macros")] {
+/// # use serde::{Deserialize, Serialize};
+/// # use serde_with::serde_as;
+/// use serde_with::base64::{Base64, Bcrypt, BinHex, Standard};
+/// use serde_with::formats::{Padded, Unpadded};
+///
+/// #[serde_as]
+/// # #[derive(Debug, PartialEq, Eq)]
+/// #[derive(Serialize, Deserialize)]
+/// struct B64 {
+///     // The default is the same as Standard character set with padding
+///     #[serde_as(as = "Base64")]
+///     default: Vec<u8>,
+///     // Only change the character set, implies padding
+///     #[serde_as(as = "Base64<BinHex>")]
+///     charset_binhex: Vec<u8>,
+///
+///     #[serde_as(as = "Base64<Standard, Padded>")]
+///     explicit_padding: Vec<u8>,
+///     #[serde_as(as = "Base64<Bcrypt, Unpadded>")]
+///     no_padding: Vec<u8>,
+/// }
+///
+/// let b64 = B64 {
+///     default: b"Hello World".to_vec(),
+///     charset_binhex: b"Hello World".to_vec(),
+///     explicit_padding: b"Hello World".to_vec(),
+///     no_padding: b"Hello World".to_vec(),
+/// };
+/// let json = serde_json::json!({
+///     "default": "SGVsbG8gV29ybGQ=",
+///     "charset_binhex": "5'8VD'mI8epaD'3=",
+///     "explicit_padding": "SGVsbG8gV29ybGQ=",
+///     "no_padding": "QETqZE6eT07wZEO",
+/// });
+///
+/// // Test serialization and deserialization
+/// assert_eq!(json, serde_json::to_value(&b64).unwrap());
+/// assert_eq!(b64, serde_json::from_value(json).unwrap());
+/// # }
+/// ```
+
+// The padding might be better as `const PADDING: bool = true`
+// https://blog.rust-lang.org/inside-rust/2021/09/06/Splitting-const-generics.html#featureconst_generics_default/
+#[derive(Copy, Clone, Debug, Default)]
+pub struct Base64<CHARSET: CharacterSet = Standard, PADDING: formats::Format = formats::Padded>(
+    PhantomData<(CHARSET, PADDING)>,
+);
+
+impl<T, CHARSET> SerializeAs<T> for Base64<CHARSET, formats::Padded>
+where
+    T: AsRef<[u8]>,
+    CHARSET: CharacterSet,
+{
+    fn serialize_as<S>(source: &T, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        base64_crate::encode_config(source, base64_crate::Config::new(CHARSET::charset(), true))
+            .serialize(serializer)
+    }
+}
+
+impl<T, CHARSET> SerializeAs<T> for Base64<CHARSET, formats::Unpadded>
+where
+    T: AsRef<[u8]>,
+    CHARSET: CharacterSet,
+{
+    fn serialize_as<S>(source: &T, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        base64_crate::encode_config(source, base64_crate::Config::new(CHARSET::charset(), false))
+            .serialize(serializer)
+    }
+}
+
+impl<'de, T, CHARSET, FORMAT> DeserializeAs<'de, T> for Base64<CHARSET, FORMAT>
+where
+    T: TryFrom<Vec<u8>>,
+    CHARSET: CharacterSet,
+    FORMAT: formats::Format,
+{
+    fn deserialize_as<D>(deserializer: D) -> Result<T, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        String::deserialize(deserializer)
+            .and_then(|s| {
+                base64_crate::decode_config(
+                    &*s,
+                    base64_crate::Config::new(CHARSET::charset(), false),
+                )
+                .map_err(Error::custom)
+            })
+            .and_then(|vec: Vec<u8>| {
+                let length = vec.len();
+                vec.try_into().map_err(|_e: T::Error| {
+                    Error::custom(format!(
+                        "Can't convert a Byte Vector of length {} to the output type.",
+                        length
+                    ))
+                })
+            })
+    }
+}
+
+/// A base64 character set from [this list](base64_crate::CharacterSet).
+pub trait CharacterSet {
+    /// Return a specific character set.
+    ///
+    /// Return one enum variant of the [`base64::CharacterSet`](base64_crate::CharacterSet) enum.
+    fn charset() -> base64_crate::CharacterSet;
+}
+
+/// The standard character set (uses `+` and `/`).
+///
+/// See [RFC 3548](https://tools.ietf.org/html/rfc3548#section-3).
+#[derive(Copy, Clone, Debug, Default)]
+pub struct Standard;
+impl CharacterSet for Standard {
+    fn charset() -> base64_crate::CharacterSet {
+        base64_crate::CharacterSet::Standard
+    }
+}
+
+/// The URL safe character set (uses `-` and `_`).
+///
+/// See [RFC 3548](https://tools.ietf.org/html/rfc3548#section-3).
+#[derive(Copy, Clone, Debug, Default)]
+pub struct UrlSafe;
+impl CharacterSet for UrlSafe {
+    fn charset() -> base64_crate::CharacterSet {
+        base64_crate::CharacterSet::UrlSafe
+    }
+}
+
+/// The `crypt(3)` character set (uses `./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz`).
+///
+/// Not standardized, but folk wisdom on the net asserts that this alphabet is what crypt uses.
+#[derive(Copy, Clone, Debug, Default)]
+pub struct Crypt;
+impl CharacterSet for Crypt {
+    fn charset() -> base64_crate::CharacterSet {
+        base64_crate::CharacterSet::Crypt
+    }
+}
+
+/// The bcrypt character set (uses `./ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789`).
+#[derive(Copy, Clone, Debug, Default)]
+pub struct Bcrypt;
+impl CharacterSet for Bcrypt {
+    fn charset() -> base64_crate::CharacterSet {
+        base64_crate::CharacterSet::Bcrypt
+    }
+}
+
+/// The character set used in IMAP-modified UTF-7 (uses `+` and `,`).
+///
+/// See [RFC 3501](https://tools.ietf.org/html/rfc3501#section-5.1.3).
+#[derive(Copy, Clone, Debug, Default)]
+pub struct ImapMutf7;
+impl CharacterSet for ImapMutf7 {
+    fn charset() -> base64_crate::CharacterSet {
+        base64_crate::CharacterSet::ImapMutf7
+    }
+}
+
+/// The character set used in BinHex 4.0 files.
+///
+/// See [BinHex 4.0 Definition](http://files.stairways.com/other/binhex-40-specs-info.txt).
+#[derive(Copy, Clone, Debug, Default)]
+pub struct BinHex;
+impl CharacterSet for BinHex {
+    fn charset() -> base64_crate::CharacterSet {
+        base64_crate::CharacterSet::BinHex
+    }
+}
diff --git a/third_party/rust/serde_with/src/chrono.rs b/third_party/rust/serde_with/src/chrono.rs
new file mode 100644
index 0000000000..d39725464f
--- /dev/null
+++ b/third_party/rust/serde_with/src/chrono.rs
@@ -0,0 +1,516 @@
+//! De/Serialization of [chrono][] types
+//!
+//! This modules is only available if using the `chrono` feature of the crate.
+//!
+//! [chrono]: https://docs.rs/chrono/
+
+use crate::{
+    de::DeserializeAs,
+    formats::{Flexible, Format, Strict, Strictness},
+    ser::SerializeAs,
+    utils::duration::{DurationSigned, Sign},
+    DurationMicroSeconds, DurationMicroSecondsWithFrac, DurationMilliSeconds,
+    DurationMilliSecondsWithFrac, DurationNanoSeconds, DurationNanoSecondsWithFrac,
+    DurationSeconds, DurationSecondsWithFrac, TimestampMicroSeconds, TimestampMicroSecondsWithFrac,
+    TimestampMilliSeconds, TimestampMilliSecondsWithFrac, TimestampNanoSeconds,
+    TimestampNanoSecondsWithFrac, TimestampSeconds, TimestampSecondsWithFrac,
+};
+use alloc::{format, string::String, vec::Vec};
+use chrono_crate::{DateTime, Duration, Local, NaiveDateTime, TimeZone, Utc};
+use core::fmt;
+use serde::{de, Deserialize, Deserializer, Serialize, Serializer};
+
+/// Create a [`DateTime`] for the Unix Epoch using the [`Utc`] timezone
+fn unix_epoch_utc() -> DateTime<Utc> {
+    DateTime::<Utc>::from_utc(NaiveDateTime::from_timestamp(0, 0), Utc)
+}
+
+/// Create a [`DateTime`] for the Unix Epoch using the [`Local`] timezone
+fn unix_epoch_local() -> DateTime<Local> {
+    DateTime::<Utc>::from_utc(NaiveDateTime::from_timestamp(0, 0), Utc).with_timezone(&Local)
+}
+
+/// Create a [`NaiveDateTime`] for the Unix Epoch
+fn unix_epoch_naive() -> NaiveDateTime {
+    NaiveDateTime::from_timestamp(0, 0)
+}
+
+/// Deserialize a Unix timestamp with optional subsecond precision into a `DateTime<Utc>`.
+///
+/// The `DateTime<Utc>` can be serialized from an integer, a float, or a string representing a number.
+///
+/// # Examples
+///
+/// ```
+/// # use chrono_crate::{DateTime, Utc};
+/// # use serde::Deserialize;
+/// #
+/// #[derive(Debug, Deserialize)]
+/// struct S {
+///     #[serde(with = "serde_with::chrono::datetime_utc_ts_seconds_from_any")]
+///     date: DateTime<Utc>,
+/// }
+///
+/// // Deserializes integers
+/// assert!(serde_json::from_str::<S>(r#"{ "date": 1478563200 }"#).is_ok());
+/// // floats
+/// assert!(serde_json::from_str::<S>(r#"{ "date": 1478563200.123 }"#).is_ok());
+/// // and strings with numbers, for high-precision values
+/// assert!(serde_json::from_str::<S>(r#"{ "date": "1478563200.123" }"#).is_ok());
+/// ```
+pub mod datetime_utc_ts_seconds_from_any {
+    use super::*;
+    use chrono_crate::{DateTime, NaiveDateTime, Utc};
+    use serde::de::{Deserializer, Error, Unexpected, Visitor};
+
+    /// Deserialize a Unix timestamp with optional subsecond precision into a `DateTime<Utc>`.
+    pub fn deserialize<'de, D>(deserializer: D) -> Result<DateTime<Utc>, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        struct Helper;
+        impl<'de> Visitor<'de> for Helper {
+            type Value = DateTime<Utc>;
+
+            fn expecting(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
+                formatter
+                    .write_str("an integer, float, or string with optional subsecond precision.")
+            }
+
+            fn visit_i64<E>(self, value: i64) -> Result<Self::Value, E>
+            where
+                E: Error,
+            {
+                let ndt = NaiveDateTime::from_timestamp_opt(value, 0);
+                if let Some(ndt) = ndt {
+                    Ok(DateTime::<Utc>::from_utc(ndt, Utc))
+                } else {
+                    Err(Error::custom(format!(
+                        "a timestamp which can be represented in a DateTime but received '{}'",
+                        value
+                    )))
+                }
+            }
+
+            fn visit_u64<E>(self, value: u64) -> Result<Self::Value, E>
+            where
+                E: Error,
+            {
+                let ndt = NaiveDateTime::from_timestamp_opt(value as i64, 0);
+                if let Some(ndt) = ndt {
+                    Ok(DateTime::<Utc>::from_utc(ndt, Utc))
+                } else {
+                    Err(Error::custom(format!(
+                        "a timestamp which can be represented in a DateTime but received '{}'",
+                        value
+                    )))
+                }
+            }
+
+            fn visit_f64<E>(self, value: f64) -> Result<Self::Value, E>
+            where
+                E: Error,
+            {
+                let seconds = value.trunc() as i64;
+                let nsecs = (value.fract() * 1_000_000_000_f64).abs() as u32;
+                let ndt = NaiveDateTime::from_timestamp_opt(seconds, nsecs);
+                if let Some(ndt) = ndt {
+                    Ok(DateTime::<Utc>::from_utc(ndt, Utc))
+                } else {
+                    Err(Error::custom(format!(
+                        "a timestamp which can be represented in a DateTime but received '{}'",
+                        value
+                    )))
+                }
+            }
+
+            fn visit_str<E>(self, value: &str) -> Result<Self::Value, E>
+            where
+                E: Error,
+            {
+                let parts: Vec<_> = value.split('.').collect();
+
+                match *parts.as_slice() {
+                    [seconds] => {
+                        if let Ok(seconds) = seconds.parse() {
+                            let ndt = NaiveDateTime::from_timestamp_opt(seconds, 0);
+                            if let Some(ndt) = ndt {
+                                Ok(DateTime::<Utc>::from_utc(ndt, Utc))
+                            } else {
+                                Err(Error::custom(format!(
+                                    "a timestamp which can be represented in a DateTime but received '{}'",
+                                    value
+                                )))
+                            }
+                        } else {
+                            Err(Error::invalid_value(Unexpected::Str(value), &self))
+                        }
+                    }
+                    [seconds, subseconds] => {
+                        if let Ok(seconds) = seconds.parse() {
+                            let subseclen = subseconds.chars().count() as u32;
+                            if subseclen > 9 {
+                                return Err(Error::custom(format!(
+                                    "DateTimes only support nanosecond precision but '{}' has more than 9 digits.",
+                                    value
+                                )));
+                            }
+
+                            if let Ok(mut subseconds) = subseconds.parse() {
+                                // convert subseconds to nanoseconds (10^-9), require 9 places for nanoseconds
+                                subseconds *= 10u32.pow(9 - subseclen);
+                                let ndt = NaiveDateTime::from_timestamp_opt(seconds, subseconds);
+                                if let Some(ndt) = ndt {
+                                    Ok(DateTime::<Utc>::from_utc(ndt, Utc))
+                                } else {
+                                    Err(Error::custom(format!(
+                                        "a timestamp which can be represented in a DateTime but received '{}'",
+                                        value
+                                    )))
+                                }
+                            } else {
+                                Err(Error::invalid_value(Unexpected::Str(value), &self))
+                            }
+                        } else {
+                            Err(Error::invalid_value(Unexpected::Str(value), &self))
+                        }
+                    }
+
+                    _ => Err(Error::invalid_value(Unexpected::Str(value), &self)),
+                }
+            }
+        }
+
+        deserializer.deserialize_any(Helper)
+    }
+}
+
+impl SerializeAs<NaiveDateTime> for DateTime<Utc> {
+    fn serialize_as<S>(source: &NaiveDateTime, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        let datetime = DateTime::<Utc>::from_utc(*source, Utc);
+        datetime.serialize(serializer)
+    }
+}
+
+impl<'de> DeserializeAs<'de, NaiveDateTime> for DateTime<Utc> {
+    fn deserialize_as<D>(deserializer: D) -> Result<NaiveDateTime, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        DateTime::<Utc>::deserialize(deserializer).map(|datetime| datetime.naive_utc())
+    }
+}
+
+/// Convert a [`chrono::Duration`] into a [`DurationSigned`]
+fn duration_into_duration_signed(dur: &Duration) -> DurationSigned {
+    match dur.to_std() {
+        Ok(dur) => DurationSigned::with_duration(Sign::Positive, dur),
+        Err(_) => {
+            if let Ok(dur) = (-*dur).to_std() {
+                DurationSigned::with_duration(Sign::Negative, dur)
+            } else {
+                panic!("A chrono Duration should be convertible to a DurationSigned")
+            }
+        }
+    }
+}
+
+/// Convert a [`DurationSigned`] into a [`chrono::Duration`]
+fn duration_from_duration_signed<'de, D>(dur: DurationSigned) -> Result<Duration, D::Error>
+where
+    D: Deserializer<'de>,
+{
+    let mut chrono_dur = match Duration::from_std(dur.duration) {
+        Ok(dur) => dur,
+        Err(msg) => {
+            return Err(de::Error::custom(format!(
+                "Duration is outside of the representable range: {}",
+                msg
+            )))
+        }
+    };
+    if dur.sign.is_negative() {
+        chrono_dur = -chrono_dur;
+    }
+    Ok(chrono_dur)
+}
+
+macro_rules! use_duration_signed_ser {
+    (
+        $main_trait:ident $internal_trait:ident =>
+        {
+            $ty:ty; $converter:ident =>
+            $({
+                $format:ty, $strictness:ty =>
+                $($tbound:ident: $bound:ident $(,)?)*
+            })*
+        }
+    ) => {
+        $(
+            impl<$($tbound ,)*> SerializeAs<$ty> for $main_trait<$format, $strictness>
+            where
+                $($tbound: $bound,)*
+            {
+                fn serialize_as<S>(source: &$ty, serializer: S) -> Result<S::Ok, S::Error>
+                where
+                    S: Serializer,
+                {
+                    let dur: DurationSigned = $converter(source);
+                    $internal_trait::<$format, $strictness>::serialize_as(
+                        &dur,
+                        serializer,
+                    )
+                }
+            }
+        )*
+    };
+    (
+        $( $main_trait:ident $internal_trait:ident, )+ => $rest:tt
+    ) => {
+        $( use_duration_signed_ser!($main_trait $internal_trait => $rest); )+
+    };
+}
+
+fn datetime_to_duration<TZ>(source: &DateTime<TZ>) -> DurationSigned
+where
+    TZ: TimeZone,
+{
+    duration_into_duration_signed(&source.clone().signed_duration_since(unix_epoch_utc()))
+}
+
+fn naive_datetime_to_duration(source: &NaiveDateTime) -> DurationSigned {
+    duration_into_duration_signed(&source.signed_duration_since(unix_epoch_naive()))
+}
+
+use_duration_signed_ser!(
+    DurationSeconds DurationSeconds,
+    DurationMilliSeconds DurationMilliSeconds,
+    DurationMicroSeconds DurationMicroSeconds,
+    DurationNanoSeconds DurationNanoSeconds,
+    => {
+        Duration; duration_into_duration_signed =>
+        {i64, STRICTNESS => STRICTNESS: Strictness}
+        {f64, STRICTNESS => STRICTNESS: Strictness}
+        {String, STRICTNESS => STRICTNESS: Strictness}
+    }
+);
+use_duration_signed_ser!(
+    TimestampSeconds DurationSeconds,
+    TimestampMilliSeconds DurationMilliSeconds,
+    TimestampMicroSeconds DurationMicroSeconds,
+    TimestampNanoSeconds DurationNanoSeconds,
+    => {
+        DateTime<TZ>; datetime_to_duration =>
+        {i64, STRICTNESS => TZ: TimeZone, STRICTNESS: Strictness}
+        {f64, STRICTNESS => TZ: TimeZone, STRICTNESS: Strictness}
+        {String, STRICTNESS => TZ: TimeZone, STRICTNESS: Strictness}
+    }
+);
+use_duration_signed_ser!(
+    TimestampSeconds DurationSeconds,
+    TimestampMilliSeconds DurationMilliSeconds,
+    TimestampMicroSeconds DurationMicroSeconds,
+    TimestampNanoSeconds DurationNanoSeconds,
+    => {
+        NaiveDateTime; naive_datetime_to_duration =>
+        {i64, STRICTNESS => STRICTNESS: Strictness}
+        {f64, STRICTNESS => STRICTNESS: Strictness}
+        {String, STRICTNESS => STRICTNESS: Strictness}
+    }
+);
+
+// Duration/Timestamp WITH FRACTIONS
+use_duration_signed_ser!(
+    DurationSecondsWithFrac DurationSecondsWithFrac,
+    DurationMilliSecondsWithFrac DurationMilliSecondsWithFrac,
+    DurationMicroSecondsWithFrac DurationMicroSecondsWithFrac,
+    DurationNanoSecondsWithFrac DurationNanoSecondsWithFrac,
+    => {
+        Duration; duration_into_duration_signed =>
+        {f64, STRICTNESS => STRICTNESS: Strictness}
+        {String, STRICTNESS => STRICTNESS: Strictness}
+    }
+);
+use_duration_signed_ser!(
+    TimestampSecondsWithFrac DurationSecondsWithFrac,
+    TimestampMilliSecondsWithFrac DurationMilliSecondsWithFrac,
+    TimestampMicroSecondsWithFrac DurationMicroSecondsWithFrac,
+    TimestampNanoSecondsWithFrac DurationNanoSecondsWithFrac,
+    => {
+        DateTime<TZ>; datetime_to_duration =>
+        {f64, STRICTNESS => TZ: TimeZone, STRICTNESS: Strictness}
+        {String, STRICTNESS => TZ: TimeZone, STRICTNESS: Strictness}
+    }
+);
+use_duration_signed_ser!(
+    TimestampSecondsWithFrac DurationSecondsWithFrac,
+    TimestampMilliSecondsWithFrac DurationMilliSecondsWithFrac,
+    TimestampMicroSecondsWithFrac DurationMicroSecondsWithFrac,
+    TimestampNanoSecondsWithFrac DurationNanoSecondsWithFrac,
+    => {
+        NaiveDateTime; naive_datetime_to_duration =>
+        {f64, STRICTNESS => STRICTNESS: Strictness}
+        {String, STRICTNESS => STRICTNESS: Strictness}
+    }
+);
+
+macro_rules! use_duration_signed_de {
+    (
+        $main_trait:ident $internal_trait:ident =>
+        {
+            $ty:ty; $converter:ident =>
+            $({
+                $format:ty, $strictness:ty =>
+                $($tbound:ident: $bound:ident)*
+            })*
+        }
+    ) =>{
+        $(
+            impl<'de, $($tbound,)*> DeserializeAs<'de, $ty> for $main_trait<$format, $strictness>
+            where
+                $($tbound: $bound,)*
+            {
+                fn deserialize_as<D>(deserializer: D) -> Result<$ty, D::Error>
+                where
+                    D: Deserializer<'de>,
+                {
+                    let dur: DurationSigned = $internal_trait::<$format, $strictness>::deserialize_as(deserializer)?;
+                    $converter::<D>(dur)
+                }
+            }
+        )*
+    };
+    (
+        $( $main_trait:ident $internal_trait:ident, )+ => $rest:tt
+    ) => {
+        $( use_duration_signed_de!($main_trait $internal_trait => $rest); )+
+    };
+}
+
+fn duration_to_datetime_utc<'de, D>(dur: DurationSigned) -> Result<DateTime<Utc>, D::Error>
+where
+    D: Deserializer<'de>,
+{
+    Ok(unix_epoch_utc() + duration_from_duration_signed::<D>(dur)?)
+}
+
+fn duration_to_datetime_local<'de, D>(dur: DurationSigned) -> Result<DateTime<Local>, D::Error>
+where
+    D: Deserializer<'de>,
+{
+    Ok(unix_epoch_local() + duration_from_duration_signed::<D>(dur)?)
+}
+
+fn duration_to_naive_datetime<'de, D>(dur: DurationSigned) -> Result<NaiveDateTime, D::Error>
+where
+    D: Deserializer<'de>,
+{
+    Ok(unix_epoch_naive() + duration_from_duration_signed::<D>(dur)?)
+}
+
+// No subsecond precision
+use_duration_signed_de!(
+    DurationSeconds DurationSeconds,
+    DurationMilliSeconds DurationMilliSeconds,
+    DurationMicroSeconds DurationMicroSeconds,
+    DurationNanoSeconds DurationNanoSeconds,
+    => {
+        Duration; duration_from_duration_signed =>
+        {i64, Strict =>}
+        {f64, Strict =>}
+        {String, Strict =>}
+        {FORMAT, Flexible => FORMAT: Format}
+    }
+);
+use_duration_signed_de!(
+    TimestampSeconds DurationSeconds,
+    TimestampMilliSeconds DurationMilliSeconds,
+    TimestampMicroSeconds DurationMicroSeconds,
+    TimestampNanoSeconds DurationNanoSeconds,
+    => {
+        DateTime<Utc>; duration_to_datetime_utc =>
+        {i64, Strict =>}
+        {f64, Strict =>}
+        {String, Strict =>}
+        {FORMAT, Flexible => FORMAT: Format}
+    }
+);
+use_duration_signed_de!(
+    TimestampSeconds DurationSeconds,
+    TimestampMilliSeconds DurationMilliSeconds,
+    TimestampMicroSeconds DurationMicroSeconds,
+    TimestampNanoSeconds DurationNanoSeconds,
+    => {
+        DateTime<Local>; duration_to_datetime_local =>
+        {i64, Strict =>}
+        {f64, Strict =>}
+        {String, Strict =>}
+        {FORMAT, Flexible => FORMAT: Format}
+    }
+);
+use_duration_signed_de!(
+    TimestampSeconds DurationSeconds,
+    TimestampMilliSeconds DurationMilliSeconds,
+    TimestampMicroSeconds DurationMicroSeconds,
+    TimestampNanoSeconds DurationNanoSeconds,
+    => {
+        NaiveDateTime; duration_to_naive_datetime =>
+        {i64, Strict =>}
+        {f64, Strict =>}
+        {String, Strict =>}
+        {FORMAT, Flexible => FORMAT: Format}
+    }
+);
+
+// Duration/Timestamp WITH FRACTIONS
+use_duration_signed_de!(
+    DurationSecondsWithFrac DurationSecondsWithFrac,
+    DurationMilliSecondsWithFrac DurationMilliSecondsWithFrac,
+    DurationMicroSecondsWithFrac DurationMicroSecondsWithFrac,
+    DurationNanoSecondsWithFrac DurationNanoSecondsWithFrac,
+    => {
+        Duration; duration_from_duration_signed =>
+        {f64, Strict =>}
+        {String, Strict =>}
+        {FORMAT, Flexible => FORMAT: Format}
+    }
+);
+use_duration_signed_de!(
+    TimestampSecondsWithFrac DurationSecondsWithFrac,
+    TimestampMilliSecondsWithFrac DurationMilliSecondsWithFrac,
+    TimestampMicroSecondsWithFrac DurationMicroSecondsWithFrac,
+    TimestampNanoSecondsWithFrac DurationNanoSecondsWithFrac,
+    => {
+        DateTime<Utc>; duration_to_datetime_utc =>
+        {f64, Strict =>}
+        {String, Strict =>}
+        {FORMAT, Flexible => FORMAT: Format}
+    }
+);
+use_duration_signed_de!(
+    TimestampSecondsWithFrac DurationSecondsWithFrac,
+    TimestampMilliSecondsWithFrac DurationMilliSecondsWithFrac,
+    TimestampMicroSecondsWithFrac DurationMicroSecondsWithFrac,
+    TimestampNanoSecondsWithFrac DurationNanoSecondsWithFrac,
+    => {
+        DateTime<Local>; duration_to_datetime_local =>
+        {f64, Strict =>}
+        {String, Strict =>}
+        {FORMAT, Flexible => FORMAT: Format}
+    }
+);
+use_duration_signed_de!(
+    TimestampSecondsWithFrac DurationSecondsWithFrac,
+    TimestampMilliSecondsWithFrac DurationMilliSecondsWithFrac,
+    TimestampMicroSecondsWithFrac DurationMicroSecondsWithFrac,
+    TimestampNanoSecondsWithFrac DurationNanoSecondsWithFrac,
+    => {
+        NaiveDateTime; duration_to_naive_datetime =>
+        {f64, Strict =>}
+        {String, Strict =>}
+        {FORMAT, Flexible => FORMAT: Format}
+    }
+);
diff --git a/third_party/rust/serde_with/src/content/mod.rs b/third_party/rust/serde_with/src/content/mod.rs
new file mode 100644
index 0000000000..711af475c8
--- /dev/null
+++ b/third_party/rust/serde_with/src/content/mod.rs
@@ -0,0 +1,5 @@
+//! Import of the unstable private `Content` type from `serde`.
+//!
+//! <https://github.com/serde-rs/serde/blob/55a7cedd737278a9d75a2efd038c6f38b8c38bd6/serde/src/private/ser.rs#L338-L997>
+
+pub(crate) mod ser;
diff --git a/third_party/rust/serde_with/src/content/ser.rs b/third_party/rust/serde_with/src/content/ser.rs
new file mode 100644
index 0000000000..be02595af9
--- /dev/null
+++ b/third_party/rust/serde_with/src/content/ser.rs
@@ -0,0 +1,623 @@
+//! Buffer for serializing data.
+//!
+//! This is a copy and improvement of the `serde` private type:
+//! <https://github.com/serde-rs/serde/blob/55a7cedd737278a9d75a2efd038c6f38b8c38bd6/serde/src/private/ser.rs#L338-L997>
+//! The code is very stable in the `serde` crate, so no maintainability problem is expected.
+//!
+//! Since the type is private we copy the type here.
+//! `serde` is licensed as MIT+Apache2, the same as this crate.
+//!
+//! This version carries improvements compared to `serde`'s version.
+//! The types support 128-bit integers, which is supported for all targets in Rust 1.40+.
+//! The [`ContentSerializer`] can also be configured to human readable or compact representation.
+
+use alloc::{borrow::ToOwned, boxed::Box, string::String, vec::Vec};
+use core::marker::PhantomData;
+use serde::ser::{self, Serialize, Serializer};
+
+#[derive(Debug)]
+pub(crate) enum Content {
+    Bool(bool),
+
+    U8(u8),
+    U16(u16),
+    U32(u32),
+    U64(u64),
+    U128(u128),
+
+    I8(i8),
+    I16(i16),
+    I32(i32),
+    I64(i64),
+    I128(i128),
+
+    F32(f32),
+    F64(f64),
+
+    Char(char),
+    String(String),
+    Bytes(Vec<u8>),
+
+    None,
+    Some(Box<Content>),
+
+    Unit,
+    UnitStruct(&'static str),
+    UnitVariant(&'static str, u32, &'static str),
+    NewtypeStruct(&'static str, Box<Content>),
+    NewtypeVariant(&'static str, u32, &'static str, Box<Content>),
+
+    Seq(Vec<Content>),
+    Tuple(Vec<Content>),
+    TupleStruct(&'static str, Vec<Content>),
+    TupleVariant(&'static str, u32, &'static str, Vec<Content>),
+    Map(Vec<(Content, Content)>),
+    Struct(&'static str, Vec<(&'static str, Content)>),
+    StructVariant(
+        &'static str,
+        u32,
+        &'static str,
+        Vec<(&'static str, Content)>,
+    ),
+}
+
+impl Serialize for Content {
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        match *self {
+            Content::Bool(b) => serializer.serialize_bool(b),
+            Content::U8(u) => serializer.serialize_u8(u),
+            Content::U16(u) => serializer.serialize_u16(u),
+            Content::U32(u) => serializer.serialize_u32(u),
+            Content::U64(u) => serializer.serialize_u64(u),
+            Content::U128(u) => serializer.serialize_u128(u),
+            Content::I8(i) => serializer.serialize_i8(i),
+            Content::I16(i) => serializer.serialize_i16(i),
+            Content::I32(i) => serializer.serialize_i32(i),
+            Content::I64(i) => serializer.serialize_i64(i),
+            Content::I128(i) => serializer.serialize_i128(i),
+            Content::F32(f) => serializer.serialize_f32(f),
+            Content::F64(f) => serializer.serialize_f64(f),
+            Content::Char(c) => serializer.serialize_char(c),
+            Content::String(ref s) => serializer.serialize_str(s),
+            Content::Bytes(ref b) => serializer.serialize_bytes(b),
+            Content::None => serializer.serialize_none(),
+            Content::Some(ref c) => serializer.serialize_some(&**c),
+            Content::Unit => serializer.serialize_unit(),
+            Content::UnitStruct(n) => serializer.serialize_unit_struct(n),
+            Content::UnitVariant(n, i, v) => serializer.serialize_unit_variant(n, i, v),
+            Content::NewtypeStruct(n, ref c) => serializer.serialize_newtype_struct(n, &**c),
+            Content::NewtypeVariant(n, i, v, ref c) => {
+                serializer.serialize_newtype_variant(n, i, v, &**c)
+            }
+            Content::Seq(ref elements) => elements.serialize(serializer),
+            Content::Tuple(ref elements) => {
+                use serde::ser::SerializeTuple;
+                let mut tuple = serializer.serialize_tuple(elements.len())?;
+                for e in elements {
+                    tuple.serialize_element(e)?;
+                }
+                tuple.end()
+            }
+            Content::TupleStruct(n, ref fields) => {
+                use serde::ser::SerializeTupleStruct;
+                let mut ts = serializer.serialize_tuple_struct(n, fields.len())?;
+                for f in fields {
+                    ts.serialize_field(f)?;
+                }
+                ts.end()
+            }
+            Content::TupleVariant(n, i, v, ref fields) => {
+                use serde::ser::SerializeTupleVariant;
+                let mut tv = serializer.serialize_tuple_variant(n, i, v, fields.len())?;
+                for f in fields {
+                    tv.serialize_field(f)?;
+                }
+                tv.end()
+            }
+            Content::Map(ref entries) => {
+                use serde::ser::SerializeMap;
+                let mut map = serializer.serialize_map(Some(entries.len()))?;
+                for &(ref k, ref v) in entries {
+                    map.serialize_entry(k, v)?;
+                }
+                map.end()
+            }
+            Content::Struct(n, ref fields) => {
+                use serde::ser::SerializeStruct;
+                let mut s = serializer.serialize_struct(n, fields.len())?;
+                for &(k, ref v) in fields {
+                    s.serialize_field(k, v)?;
+                }
+                s.end()
+            }
+            Content::StructVariant(n, i, v, ref fields) => {
+                use serde::ser::SerializeStructVariant;
+                let mut sv = serializer.serialize_struct_variant(n, i, v, fields.len())?;
+                for &(k, ref v) in fields {
+                    sv.serialize_field(k, v)?;
+                }
+                sv.end()
+            }
+        }
+    }
+}
+
+pub(crate) struct ContentSerializer<E> {
+    is_human_readable: bool,
+    error: PhantomData<E>,
+}
+
+impl<E> ContentSerializer<E> {
+    pub(crate) fn new(is_human_readable: bool) -> Self {
+        ContentSerializer {
+            is_human_readable,
+            error: PhantomData,
+        }
+    }
+}
+
+impl<E> Default for ContentSerializer<E> {
+    fn default() -> Self {
+        Self::new(true)
+    }
+}
+
+impl<E> Serializer for ContentSerializer<E>
+where
+    E: ser::Error,
+{
+    type Ok = Content;
+    type Error = E;
+
+    type SerializeSeq = SerializeSeq<E>;
+    type SerializeTuple = SerializeTuple<E>;
+    type SerializeTupleStruct = SerializeTupleStruct<E>;
+    type SerializeTupleVariant = SerializeTupleVariant<E>;
+    type SerializeMap = SerializeMap<E>;
+    type SerializeStruct = SerializeStruct<E>;
+    type SerializeStructVariant = SerializeStructVariant<E>;
+
+    fn is_human_readable(&self) -> bool {
+        self.is_human_readable
+    }
+
+    fn serialize_bool(self, v: bool) -> Result<Content, E> {
+        Ok(Content::Bool(v))
+    }
+
+    fn serialize_i8(self, v: i8) -> Result<Content, E> {
+        Ok(Content::I8(v))
+    }
+
+    fn serialize_i16(self, v: i16) -> Result<Content, E> {
+        Ok(Content::I16(v))
+    }
+
+    fn serialize_i32(self, v: i32) -> Result<Content, E> {
+        Ok(Content::I32(v))
+    }
+
+    fn serialize_i64(self, v: i64) -> Result<Content, E> {
+        Ok(Content::I64(v))
+    }
+
+    fn serialize_i128(self, v: i128) -> Result<Content, E> {
+        Ok(Content::I128(v))
+    }
+
+    fn serialize_u8(self, v: u8) -> Result<Content, E> {
+        Ok(Content::U8(v))
+    }
+
+    fn serialize_u16(self, v: u16) -> Result<Content, E> {
+        Ok(Content::U16(v))
+    }
+
+    fn serialize_u32(self, v: u32) -> Result<Content, E> {
+        Ok(Content::U32(v))
+    }
+
+    fn serialize_u64(self, v: u64) -> Result<Content, E> {
+        Ok(Content::U64(v))
+    }
+
+    fn serialize_u128(self, v: u128) -> Result<Content, E> {
+        Ok(Content::U128(v))
+    }
+
+    fn serialize_f32(self, v: f32) -> Result<Content, E> {
+        Ok(Content::F32(v))
+    }
+
+    fn serialize_f64(self, v: f64) -> Result<Content, E> {
+        Ok(Content::F64(v))
+    }
+
+    fn serialize_char(self, v: char) -> Result<Content, E> {
+        Ok(Content::Char(v))
+    }
+
+    fn serialize_str(self, value: &str) -> Result<Content, E> {
+        Ok(Content::String(value.to_owned()))
+    }
+
+    fn serialize_bytes(self, value: &[u8]) -> Result<Content, E> {
+        Ok(Content::Bytes(value.to_owned()))
+    }
+
+    fn serialize_none(self) -> Result<Content, E> {
+        Ok(Content::None)
+    }
+
+    fn serialize_some<T: ?Sized>(self, value: &T) -> Result<Content, E>
+    where
+        T: Serialize,
+    {
+        Ok(Content::Some(Box::new(value.serialize(self)?)))
+    }
+
+    fn serialize_unit(self) -> Result<Content, E> {
+        Ok(Content::Unit)
+    }
+
+    fn serialize_unit_struct(self, name: &'static str) -> Result<Content, E> {
+        Ok(Content::UnitStruct(name))
+    }
+
+    fn serialize_unit_variant(
+        self,
+        name: &'static str,
+        variant_index: u32,
+        variant: &'static str,
+    ) -> Result<Content, E> {
+        Ok(Content::UnitVariant(name, variant_index, variant))
+    }
+
+    fn serialize_newtype_struct<T: ?Sized>(
+        self,
+        name: &'static str,
+        value: &T,
+    ) -> Result<Content, E>
+    where
+        T: Serialize,
+    {
+        Ok(Content::NewtypeStruct(
+            name,
+            Box::new(value.serialize(self)?),
+        ))
+    }
+
+    fn serialize_newtype_variant<T: ?Sized>(
+        self,
+        name: &'static str,
+        variant_index: u32,
+        variant: &'static str,
+        value: &T,
+    ) -> Result<Content, E>
+    where
+        T: Serialize,
+    {
+        Ok(Content::NewtypeVariant(
+            name,
+            variant_index,
+            variant,
+            Box::new(value.serialize(self)?),
+        ))
+    }
+
+    fn serialize_seq(self, len: Option<usize>) -> Result<Self::SerializeSeq, E> {
+        Ok(SerializeSeq {
+            is_human_readable: self.is_human_readable,
+            elements: Vec::with_capacity(len.unwrap_or(0)),
+            error: PhantomData,
+        })
+    }
+
+    fn serialize_tuple(self, len: usize) -> Result<Self::SerializeTuple, E> {
+        Ok(SerializeTuple {
+            is_human_readable: self.is_human_readable,
+            elements: Vec::with_capacity(len),
+            error: PhantomData,
+        })
+    }
+
+    fn serialize_tuple_struct(
+        self,
+        name: &'static str,
+        len: usize,
+    ) -> Result<Self::SerializeTupleStruct, E> {
+        Ok(SerializeTupleStruct {
+            is_human_readable: self.is_human_readable,
+            name,
+            fields: Vec::with_capacity(len),
+            error: PhantomData,
+        })
+    }
+
+    fn serialize_tuple_variant(
+        self,
+        name: &'static str,
+        variant_index: u32,
+        variant: &'static str,
+        len: usize,
+    ) -> Result<Self::SerializeTupleVariant, E> {
+        Ok(SerializeTupleVariant {
+            is_human_readable: self.is_human_readable,
+            name,
+            variant_index,
+            variant,
+            fields: Vec::with_capacity(len),
+            error: PhantomData,
+        })
+    }
+
+    fn serialize_map(self, len: Option<usize>) -> Result<Self::SerializeMap, E> {
+        Ok(SerializeMap {
+            is_human_readable: self.is_human_readable,
+            entries: Vec::with_capacity(len.unwrap_or(0)),
+            key: None,
+            error: PhantomData,
+        })
+    }
+
+    fn serialize_struct(self, name: &'static str, len: usize) -> Result<Self::SerializeStruct, E> {
+        Ok(SerializeStruct {
+            is_human_readable: self.is_human_readable,
+            name,
+            fields: Vec::with_capacity(len),
+            error: PhantomData,
+        })
+    }
+
+    fn serialize_struct_variant(
+        self,
+        name: &'static str,
+        variant_index: u32,
+        variant: &'static str,
+        len: usize,
+    ) -> Result<Self::SerializeStructVariant, E> {
+        Ok(SerializeStructVariant {
+            is_human_readable: self.is_human_readable,
+            name,
+            variant_index,
+            variant,
+            fields: Vec::with_capacity(len),
+            error: PhantomData,
+        })
+    }
+}
+
+pub(crate) struct SerializeSeq<E> {
+    is_human_readable: bool,
+    elements: Vec<Content>,
+    error: PhantomData<E>,
+}
+
+impl<E> ser::SerializeSeq for SerializeSeq<E>
+where
+    E: ser::Error,
+{
+    type Ok = Content;
+    type Error = E;
+
+    fn serialize_element<T: ?Sized>(&mut self, value: &T) -> Result<(), E>
+    where
+        T: Serialize,
+    {
+        let value = value.serialize(ContentSerializer::<E>::new(self.is_human_readable))?;
+        self.elements.push(value);
+        Ok(())
+    }
+
+    fn end(self) -> Result<Content, E> {
+        Ok(Content::Seq(self.elements))
+    }
+}
+
+pub(crate) struct SerializeTuple<E> {
+    is_human_readable: bool,
+    elements: Vec<Content>,
+    error: PhantomData<E>,
+}
+
+impl<E> ser::SerializeTuple for SerializeTuple<E>
+where
+    E: ser::Error,
+{
+    type Ok = Content;
+    type Error = E;
+
+    fn serialize_element<T: ?Sized>(&mut self, value: &T) -> Result<(), E>
+    where
+        T: Serialize,
+    {
+        let value = value.serialize(ContentSerializer::<E>::new(self.is_human_readable))?;
+        self.elements.push(value);
+        Ok(())
+    }
+
+    fn end(self) -> Result<Content, E> {
+        Ok(Content::Tuple(self.elements))
+    }
+}
+
+pub(crate) struct SerializeTupleStruct<E> {
+    is_human_readable: bool,
+    name: &'static str,
+    fields: Vec<Content>,
+    error: PhantomData<E>,
+}
+
+impl<E> ser::SerializeTupleStruct for SerializeTupleStruct<E>
+where
+    E: ser::Error,
+{
+    type Ok = Content;
+    type Error = E;
+
+    fn serialize_field<T: ?Sized>(&mut self, value: &T) -> Result<(), E>
+    where
+        T: Serialize,
+    {
+        let value = value.serialize(ContentSerializer::<E>::new(self.is_human_readable))?;
+        self.fields.push(value);
+        Ok(())
+    }
+
+    fn end(self) -> Result<Content, E> {
+        Ok(Content::TupleStruct(self.name, self.fields))
+    }
+}
+
+pub(crate) struct SerializeTupleVariant<E> {
+    is_human_readable: bool,
+    name: &'static str,
+    variant_index: u32,
+    variant: &'static str,
+    fields: Vec<Content>,
+    error: PhantomData<E>,
+}
+
+impl<E> ser::SerializeTupleVariant for SerializeTupleVariant<E>
+where
+    E: ser::Error,
+{
+    type Ok = Content;
+    type Error = E;
+
+    fn serialize_field<T: ?Sized>(&mut self, value: &T) -> Result<(), E>
+    where
+        T: Serialize,
+    {
+        let value = value.serialize(ContentSerializer::<E>::new(self.is_human_readable))?;
+        self.fields.push(value);
+        Ok(())
+    }
+
+    fn end(self) -> Result<Content, E> {
+        Ok(Content::TupleVariant(
+            self.name,
+            self.variant_index,
+            self.variant,
+            self.fields,
+        ))
+    }
+}
+
+pub(crate) struct SerializeMap<E> {
+    is_human_readable: bool,
+    entries: Vec<(Content, Content)>,
+    key: Option<Content>,
+    error: PhantomData<E>,
+}
+
+impl<E> ser::SerializeMap for SerializeMap<E>
+where
+    E: ser::Error,
+{
+    type Ok = Content;
+    type Error = E;
+
+    fn serialize_key<T: ?Sized>(&mut self, key: &T) -> Result<(), E>
+    where
+        T: Serialize,
+    {
+        let key = key.serialize(ContentSerializer::<E>::new(self.is_human_readable))?;
+        self.key = Some(key);
+        Ok(())
+    }
+
+    fn serialize_value<T: ?Sized>(&mut self, value: &T) -> Result<(), E>
+    where
+        T: Serialize,
+    {
+        let key = self
+            .key
+            .take()
+            .expect("serialize_value called before serialize_key");
+        let value = value.serialize(ContentSerializer::<E>::new(self.is_human_readable))?;
+        self.entries.push((key, value));
+        Ok(())
+    }
+
+    fn end(self) -> Result<Content, E> {
+        Ok(Content::Map(self.entries))
+    }
+
+    fn serialize_entry<K: ?Sized, V: ?Sized>(&mut self, key: &K, value: &V) -> Result<(), E>
+    where
+        K: Serialize,
+        V: Serialize,
+    {
+        let key = key.serialize(ContentSerializer::<E>::new(self.is_human_readable))?;
+        let value = value.serialize(ContentSerializer::<E>::new(self.is_human_readable))?;
+        self.entries.push((key, value));
+        Ok(())
+    }
+}
+
+pub(crate) struct SerializeStruct<E> {
+    is_human_readable: bool,
+    name: &'static str,
+    fields: Vec<(&'static str, Content)>,
+    error: PhantomData<E>,
+}
+
+impl<E> ser::SerializeStruct for SerializeStruct<E>
+where
+    E: ser::Error,
+{
+    type Ok = Content;
+    type Error = E;
+
+    fn serialize_field<T: ?Sized>(&mut self, key: &'static str, value: &T) -> Result<(), E>
+    where
+        T: Serialize,
+    {
+        let value = value.serialize(ContentSerializer::<E>::new(self.is_human_readable))?;
+        self.fields.push((key, value));
+        Ok(())
+    }
+
+    fn end(self) -> Result<Content, E> {
+        Ok(Content::Struct(self.name, self.fields))
+    }
+}
+
+pub(crate) struct SerializeStructVariant<E> {
+    is_human_readable: bool,
+    name: &'static str,
+    variant_index: u32,
+    variant: &'static str,
+    fields: Vec<(&'static str, Content)>,
+    error: PhantomData<E>,
+}
+
+impl<E> ser::SerializeStructVariant for SerializeStructVariant<E>
+where
+    E: ser::Error,
+{
+    type Ok = Content;
+    type Error = E;
+
+    fn serialize_field<T: ?Sized>(&mut self, key: &'static str, value: &T) -> Result<(), E>
+    where
+        T: Serialize,
+    {
+        let value = value.serialize(ContentSerializer::<E>::new(self.is_human_readable))?;
+        self.fields.push((key, value));
+        Ok(())
+    }
+
+    fn end(self) -> Result<Content, E> {
+        Ok(Content::StructVariant(
+            self.name,
+            self.variant_index,
+            self.variant,
+            self.fields,
+        ))
+    }
+}
diff --git a/third_party/rust/serde_with/src/de/const_arrays.rs b/third_party/rust/serde_with/src/de/const_arrays.rs
new file mode 100644
index 0000000000..63f6d662d6
--- /dev/null
+++ b/third_party/rust/serde_with/src/de/const_arrays.rs
@@ -0,0 +1,338 @@
+use super::*;
+use crate::utils::{MapIter, SeqIter};
+use alloc::{borrow::Cow, boxed::Box, collections::BTreeMap, string::String, vec::Vec};
+use core::{convert::TryInto, fmt, mem::MaybeUninit};
+use serde::de::*;
+use std::collections::HashMap;
+
+// TODO this should probably be moved into the utils module when const generics are available for MSRV
+
+/// # Safety
+/// The code follow exactly the pattern of initializing an array element-by-element from the standard library.
+/// <https://doc.rust-lang.org/nightly/std/mem/union.MaybeUninit.html#initializing-an-array-element-by-element>
+fn array_from_iterator<I, T, E, const N: usize>(
+    mut iter: I,
+    expected: &dyn Expected,
+) -> Result<[T; N], E>
+where
+    I: Iterator<Item = Result<T, E>>,
+    E: Error,
+{
+    fn drop_array_elems<T, const N: usize>(num: usize, mut arr: [MaybeUninit<T>; N]) {
+        arr[..num].iter_mut().for_each(|elem| {
+            // TODO This would be better with assume_init_drop nightly function
+            // https://github.com/rust-lang/rust/issues/63567
+            unsafe { core::ptr::drop_in_place(elem.as_mut_ptr()) };
+        });
+    }
+
+    // Create an uninitialized array of `MaybeUninit`. The `assume_init` is
+    // safe because the type we are claiming to have initialized here is a
+    // bunch of `MaybeUninit`s, which do not require initialization.
+    //
+    // TODO could be simplified with nightly maybe_uninit_uninit_array feature
+    // https://doc.rust-lang.org/nightly/std/mem/union.MaybeUninit.html#method.uninit_array
+    let mut arr: [MaybeUninit<T>; N] = unsafe { MaybeUninit::uninit().assume_init() };
+
+    // Dropping a `MaybeUninit` does nothing. Thus using raw pointer
+    // assignment instead of `ptr::write` does not cause the old
+    // uninitialized value to be dropped. Also if there is a panic during
+    // this loop, we have a memory leak, but there is no memory safety
+    // issue.
+    for (idx, elem) in arr[..].iter_mut().enumerate() {
+        *elem = match iter.next() {
+            Some(Ok(value)) => MaybeUninit::new(value),
+            Some(Err(err)) => {
+                drop_array_elems(idx, arr);
+                return Err(err);
+            }
+            None => {
+                drop_array_elems(idx, arr);
+                return Err(Error::invalid_length(idx, expected));
+            }
+        };
+    }
+
+    // Everything is initialized. Transmute the array to the
+    // initialized type.
+    // A normal transmute is not possible because of:
+    // https://github.com/rust-lang/rust/issues/61956
+    Ok(unsafe { core::mem::transmute_copy::<_, [T; N]>(&arr) })
+}
+
+impl<'de, T, As, const N: usize> DeserializeAs<'de, [T; N]> for [As; N]
+where
+    As: DeserializeAs<'de, T>,
+{
+    fn deserialize_as<D>(deserializer: D) -> Result<[T; N], D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        struct ArrayVisitor<T, const M: usize>(PhantomData<T>);
+
+        impl<'de, T, As, const M: usize> Visitor<'de> for ArrayVisitor<DeserializeAsWrap<T, As>, M>
+        where
+            As: DeserializeAs<'de, T>,
+        {
+            type Value = [T; M];
+
+            fn expecting(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
+                formatter.write_fmt(format_args!("an array of size {}", M))
+            }
+
+            fn visit_seq<A>(self, seq: A) -> Result<Self::Value, A::Error>
+            where
+                A: SeqAccess<'de>,
+            {
+                array_from_iterator(
+                    SeqIter::new(seq).map(|res: Result<DeserializeAsWrap<T, As>, A::Error>| {
+                        res.map(|t| t.into_inner())
+                    }),
+                    &self,
+                )
+            }
+        }
+
+        deserializer.deserialize_tuple(N, ArrayVisitor::<DeserializeAsWrap<T, As>, N>(PhantomData))
+    }
+}
+
+macro_rules! tuple_seq_as_map_impl_intern {
+    ($tyorig:ty, $ty:ident <KAs, VAs>) => {
+        #[allow(clippy::implicit_hasher)]
+        impl<'de, K, KAs, V, VAs, const N: usize> DeserializeAs<'de, $tyorig> for $ty<KAs, VAs>
+        where
+            KAs: DeserializeAs<'de, K>,
+            VAs: DeserializeAs<'de, V>,
+        {
+            fn deserialize_as<D>(deserializer: D) -> Result<$tyorig, D::Error>
+            where
+                D: Deserializer<'de>,
+            {
+                struct MapVisitor<K, KAs, V, VAs, const M: usize> {
+                    marker: PhantomData<(K, KAs, V, VAs)>,
+                }
+
+                impl<'de, K, KAs, V, VAs, const M: usize> Visitor<'de> for MapVisitor<K, KAs, V, VAs, M>
+                where
+                    KAs: DeserializeAs<'de, K>,
+                    VAs: DeserializeAs<'de, V>,
+                {
+                    type Value = [(K, V); M];
+
+                    fn expecting(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
+                        formatter.write_fmt(format_args!("a map of length {}", M))
+                    }
+
+                    fn visit_map<A>(self, access: A) -> Result<Self::Value, A::Error>
+                    where
+                        A: MapAccess<'de>,
+                    {
+                        array_from_iterator(MapIter::new(access).map(
+                            |res: Result<(DeserializeAsWrap<K, KAs>, DeserializeAsWrap<V, VAs>), A::Error>| {
+                                res.map(|(k, v)| (k.into_inner(), v.into_inner()))
+                            }
+                        ), &self)
+                    }
+                }
+
+                let visitor = MapVisitor::<K, KAs, V, VAs, N> {
+                    marker: PhantomData,
+                };
+                deserializer.deserialize_map(visitor)
+            }
+        }
+    }
+}
+tuple_seq_as_map_impl_intern!([(K, V); N], BTreeMap<KAs, VAs>);
+tuple_seq_as_map_impl_intern!([(K, V); N], HashMap<KAs, VAs>);
+
+impl<'de, const N: usize> DeserializeAs<'de, [u8; N]> for Bytes {
+    fn deserialize_as<D>(deserializer: D) -> Result<[u8; N], D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        struct ArrayVisitor<const M: usize>;
+
+        impl<'de, const M: usize> Visitor<'de> for ArrayVisitor<M> {
+            type Value = [u8; M];
+
+            fn expecting(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
+                formatter.write_fmt(format_args!("an byte array of size {}", M))
+            }
+
+            fn visit_seq<A>(self, seq: A) -> Result<Self::Value, A::Error>
+            where
+                A: SeqAccess<'de>,
+            {
+                array_from_iterator(SeqIter::new(seq), &self)
+            }
+
+            fn visit_bytes<E>(self, v: &[u8]) -> Result<Self::Value, E>
+            where
+                E: Error,
+            {
+                v.try_into()
+                    .map_err(|_| Error::invalid_length(v.len(), &self))
+            }
+
+            fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
+            where
+                E: Error,
+            {
+                v.as_bytes()
+                    .try_into()
+                    .map_err(|_| Error::invalid_length(v.len(), &self))
+            }
+        }
+
+        deserializer.deserialize_bytes(ArrayVisitor::<N>)
+    }
+}
+
+impl<'de, const N: usize> DeserializeAs<'de, &'de [u8; N]> for Bytes {
+    fn deserialize_as<D>(deserializer: D) -> Result<&'de [u8; N], D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        struct ArrayVisitor<const M: usize>;
+
+        impl<'de, const M: usize> Visitor<'de> for ArrayVisitor<M> {
+            type Value = &'de [u8; M];
+
+            fn expecting(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
+                formatter.write_fmt(format_args!("a borrowed byte array of size {}", M))
+            }
+
+            fn visit_borrowed_bytes<E>(self, v: &'de [u8]) -> Result<Self::Value, E>
+            where
+                E: Error,
+            {
+                v.try_into()
+                    .map_err(|_| Error::invalid_length(v.len(), &self))
+            }
+
+            fn visit_borrowed_str<E>(self, v: &'de str) -> Result<Self::Value, E>
+            where
+                E: Error,
+            {
+                v.as_bytes()
+                    .try_into()
+                    .map_err(|_| Error::invalid_length(v.len(), &self))
+            }
+        }
+
+        deserializer.deserialize_bytes(ArrayVisitor::<N>)
+    }
+}
+
+impl<'de, const N: usize> DeserializeAs<'de, Cow<'de, [u8; N]>> for Bytes {
+    fn deserialize_as<D>(deserializer: D) -> Result<Cow<'de, [u8; N]>, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        struct CowVisitor<const M: usize>;
+
+        impl<'de, const M: usize> Visitor<'de> for CowVisitor<M> {
+            type Value = Cow<'de, [u8; M]>;
+
+            fn expecting(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
+                formatter.write_str("a byte array")
+            }
+
+            fn visit_borrowed_bytes<E>(self, v: &'de [u8]) -> Result<Self::Value, E>
+            where
+                E: Error,
+            {
+                Ok(Cow::Borrowed(
+                    v.try_into()
+                        .map_err(|_| Error::invalid_length(v.len(), &self))?,
+                ))
+            }
+
+            fn visit_borrowed_str<E>(self, v: &'de str) -> Result<Self::Value, E>
+            where
+                E: Error,
+            {
+                Ok(Cow::Borrowed(
+                    v.as_bytes()
+                        .try_into()
+                        .map_err(|_| Error::invalid_length(v.len(), &self))?,
+                ))
+            }
+
+            fn visit_bytes<E>(self, v: &[u8]) -> Result<Self::Value, E>
+            where
+                E: Error,
+            {
+                Ok(Cow::Owned(
+                    v.to_vec()
+                        .try_into()
+                        .map_err(|_| Error::invalid_length(v.len(), &self))?,
+                ))
+            }
+
+            fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
+            where
+                E: Error,
+            {
+                Ok(Cow::Owned(
+                    v.as_bytes()
+                        .to_vec()
+                        .try_into()
+                        .map_err(|_| Error::invalid_length(v.len(), &self))?,
+                ))
+            }
+
+            fn visit_byte_buf<E>(self, v: Vec<u8>) -> Result<Self::Value, E>
+            where
+                E: Error,
+            {
+                let len = v.len();
+                Ok(Cow::Owned(
+                    v.try_into()
+                        .map_err(|_| Error::invalid_length(len, &self))?,
+                ))
+            }
+
+            fn visit_string<E>(self, v: String) -> Result<Self::Value, E>
+            where
+                E: Error,
+            {
+                let len = v.len();
+                Ok(Cow::Owned(
+                    v.into_bytes()
+                        .try_into()
+                        .map_err(|_| Error::invalid_length(len, &self))?,
+                ))
+            }
+
+            fn visit_seq<V>(self, seq: V) -> Result<Self::Value, V::Error>
+            where
+                V: SeqAccess<'de>,
+            {
+                Ok(Cow::Owned(array_from_iterator(SeqIter::new(seq), &self)?))
+            }
+        }
+
+        deserializer.deserialize_bytes(CowVisitor)
+    }
+}
+
+impl<'de, const N: usize> DeserializeAs<'de, Box<[u8; N]>> for Bytes {
+    fn deserialize_as<D>(deserializer: D) -> Result<Box<[u8; N]>, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        Bytes::deserialize_as(deserializer).map(Box::new)
+    }
+}
+
+impl<'de, const N: usize> DeserializeAs<'de, Cow<'de, [u8; N]>> for BorrowCow {
+    fn deserialize_as<D>(deserializer: D) -> Result<Cow<'de, [u8; N]>, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        Bytes::deserialize_as(deserializer)
+    }
+}
diff --git a/third_party/rust/serde_with/src/de/impls.rs b/third_party/rust/serde_with/src/de/impls.rs
new file mode 100644
index 0000000000..fc960c3d07
--- /dev/null
+++ b/third_party/rust/serde_with/src/de/impls.rs
@@ -0,0 +1,1508 @@
+use super::*;
+use crate::{
+    formats::{Flexible, Format, Strict},
+    rust::StringWithSeparator,
+    utils,
+    utils::duration::DurationSigned,
+};
+use alloc::{
+    borrow::{Cow, ToOwned},
+    boxed::Box,
+    collections::{BTreeMap, BTreeSet, BinaryHeap, LinkedList, VecDeque},
+    rc::{Rc, Weak as RcWeak},
+    string::String,
+    sync::{Arc, Weak as ArcWeak},
+    vec::Vec,
+};
+use core::{
+    cell::{Cell, RefCell},
+    convert::TryInto,
+    fmt::{self, Display},
+    hash::{BuildHasher, Hash},
+    iter::FromIterator,
+    str::FromStr,
+    time::Duration,
+};
+#[cfg(feature = "indexmap")]
+use indexmap_crate::{IndexMap, IndexSet};
+use serde::de::*;
+use std::{
+    collections::{HashMap, HashSet},
+    sync::{Mutex, RwLock},
+    time::SystemTime,
+};
+
+///////////////////////////////////////////////////////////////////////////////
+// region: Simple Wrapper types (e.g., Box, Option)
+
+impl<'de, T, U> DeserializeAs<'de, Box<T>> for Box<U>
+where
+    U: DeserializeAs<'de, T>,
+{
+    fn deserialize_as<D>(deserializer: D) -> Result<Box<T>, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        Ok(Box::new(
+            DeserializeAsWrap::<T, U>::deserialize(deserializer)?.into_inner(),
+        ))
+    }
+}
+
+impl<'de, T, U> DeserializeAs<'de, Option<T>> for Option<U>
+where
+    U: DeserializeAs<'de, T>,
+{
+    fn deserialize_as<D>(deserializer: D) -> Result<Option<T>, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        struct OptionVisitor<T, U>(PhantomData<(T, U)>);
+
+        impl<'de, T, U> Visitor<'de> for OptionVisitor<T, U>
+        where
+            U: DeserializeAs<'de, T>,
+        {
+            type Value = Option<T>;
+
+            fn expecting(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
+                formatter.write_str("option")
+            }
+
+            #[inline]
+            fn visit_unit<E>(self) -> Result<Self::Value, E>
+            where
+                E: Error,
+            {
+                Ok(None)
+            }
+
+            #[inline]
+            fn visit_none<E>(self) -> Result<Self::Value, E>
+            where
+                E: Error,
+            {
+                Ok(None)
+            }
+
+            #[inline]
+            fn visit_some<D>(self, deserializer: D) -> Result<Self::Value, D::Error>
+            where
+                D: Deserializer<'de>,
+            {
+                U::deserialize_as(deserializer).map(Some)
+            }
+        }
+
+        deserializer.deserialize_option(OptionVisitor::<T, U>(PhantomData))
+    }
+}
+
+impl<'de, T, U> DeserializeAs<'de, Rc<T>> for Rc<U>
+where
+    U: DeserializeAs<'de, T>,
+{
+    fn deserialize_as<D>(deserializer: D) -> Result<Rc<T>, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        Ok(Rc::new(
+            DeserializeAsWrap::<T, U>::deserialize(deserializer)?.into_inner(),
+        ))
+    }
+}
+
+impl<'de, T, U> DeserializeAs<'de, RcWeak<T>> for RcWeak<U>
+where
+    U: DeserializeAs<'de, T>,
+{
+    fn deserialize_as<D>(deserializer: D) -> Result<RcWeak<T>, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        DeserializeAsWrap::<Option<Rc<T>>, Option<Rc<U>>>::deserialize(deserializer)?;
+        Ok(RcWeak::new())
+    }
+}
+
+impl<'de, T, U> DeserializeAs<'de, Arc<T>> for Arc<U>
+where
+    U: DeserializeAs<'de, T>,
+{
+    fn deserialize_as<D>(deserializer: D) -> Result<Arc<T>, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        Ok(Arc::new(
+            DeserializeAsWrap::<T, U>::deserialize(deserializer)?.into_inner(),
+        ))
+    }
+}
+
+impl<'de, T, U> DeserializeAs<'de, ArcWeak<T>> for ArcWeak<U>
+where
+    U: DeserializeAs<'de, T>,
+{
+    fn deserialize_as<D>(deserializer: D) -> Result<ArcWeak<T>, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        DeserializeAsWrap::<Option<Arc<T>>, Option<Arc<U>>>::deserialize(deserializer)?;
+        Ok(ArcWeak::new())
+    }
+}
+
+impl<'de, T, U> DeserializeAs<'de, Cell<T>> for Cell<U>
+where
+    U: DeserializeAs<'de, T>,
+{
+    fn deserialize_as<D>(deserializer: D) -> Result<Cell<T>, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        Ok(Cell::new(
+            DeserializeAsWrap::<T, U>::deserialize(deserializer)?.into_inner(),
+        ))
+    }
+}
+
+impl<'de, T, U> DeserializeAs<'de, RefCell<T>> for RefCell<U>
+where
+    U: DeserializeAs<'de, T>,
+{
+    fn deserialize_as<D>(deserializer: D) -> Result<RefCell<T>, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        Ok(RefCell::new(
+            DeserializeAsWrap::<T, U>::deserialize(deserializer)?.into_inner(),
+        ))
+    }
+}
+
+impl<'de, T, U> DeserializeAs<'de, Mutex<T>> for Mutex<U>
+where
+    U: DeserializeAs<'de, T>,
+{
+    fn deserialize_as<D>(deserializer: D) -> Result<Mutex<T>, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        Ok(Mutex::new(
+            DeserializeAsWrap::<T, U>::deserialize(deserializer)?.into_inner(),
+        ))
+    }
+}
+
+impl<'de, T, U> DeserializeAs<'de, RwLock<T>> for RwLock<U>
+where
+    U: DeserializeAs<'de, T>,
+{
+    fn deserialize_as<D>(deserializer: D) -> Result<RwLock<T>, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        Ok(RwLock::new(
+            DeserializeAsWrap::<T, U>::deserialize(deserializer)?.into_inner(),
+        ))
+    }
+}
+
+impl<'de, T, TAs, E, EAs> DeserializeAs<'de, Result<T, E>> for Result<TAs, EAs>
+where
+    TAs: DeserializeAs<'de, T>,
+    EAs: DeserializeAs<'de, E>,
+{
+    fn deserialize_as<D>(deserializer: D) -> Result<Result<T, E>, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        Ok(
+            match Result::<DeserializeAsWrap<T, TAs>, DeserializeAsWrap<E, EAs>>::deserialize(
+                deserializer,
+            )? {
+                Ok(value) => Ok(value.into_inner()),
+                Err(err) => Err(err.into_inner()),
+            },
+        )
+    }
+}
+
+// endregion
+///////////////////////////////////////////////////////////////////////////////
+// region: Collection Types (e.g., Maps, Sets, Vec)
+
+macro_rules! seq_impl {
+    (
+        $ty:ident < T $(: $tbound1:ident $(+ $tbound2:ident)*)* $(, $typaram:ident : $bound1:ident $(+ $bound2:ident)* )* >,
+        $access:ident,
+        $with_capacity:expr,
+        $append:ident
+    ) => {
+        // Fix for clippy regression in macros on stable
+        // The bug no longer exists on nightly
+        // https://github.com/rust-lang/rust-clippy/issues/7768
+        #[allow(clippy::semicolon_if_nothing_returned)]
+        impl<'de, T, U $(, $typaram)*> DeserializeAs<'de, $ty<T $(, $typaram)*>> for $ty<U $(, $typaram)*>
+        where
+            U: DeserializeAs<'de, T>,
+            $(T: $tbound1 $(+ $tbound2)*,)*
+            $($typaram: $bound1 $(+ $bound2)*),*
+        {
+            fn deserialize_as<D>(deserializer: D) -> Result<$ty<T $(, $typaram)*>, D::Error>
+            where
+                D: Deserializer<'de>,
+            {
+                struct SeqVisitor<T, U $(, $typaram)*> {
+                    marker: PhantomData<(T, U $(, $typaram)*)>,
+                }
+
+                impl<'de, T, U $(, $typaram)*> Visitor<'de> for SeqVisitor<T, U $(, $typaram)*>
+                where
+                    U: DeserializeAs<'de, T>,
+                    $(T: $tbound1 $(+ $tbound2)*,)*
+                    $($typaram: $bound1 $(+ $bound2)*),*
+                {
+                    type Value = $ty<T $(, $typaram)*>;
+
+                    fn expecting(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
+                        formatter.write_str("a sequence")
+                    }
+
+                    fn visit_seq<A>(self, mut $access: A) -> Result<Self::Value, A::Error>
+                    where
+                        A: SeqAccess<'de>,
+                    {
+                        let mut values = $with_capacity;
+
+                        while let Some(value) = $access
+                            .next_element()?
+                            .map(|v: DeserializeAsWrap<T, U>| v.into_inner())
+                        {
+                            values.$append(value);
+                        }
+
+                        Ok(values.into())
+                    }
+                }
+
+                let visitor = SeqVisitor::<T, U $(, $typaram)*> {
+                    marker: PhantomData,
+                };
+                deserializer.deserialize_seq(visitor)
+            }
+        }
+    };
+}
+
+type BoxedSlice<T> = Box<[T]>;
+seq_impl!(
+    BinaryHeap<T: Ord>,
+    seq,
+    BinaryHeap::with_capacity(utils::size_hint_cautious(seq.size_hint())),
+    push
+);
+seq_impl!(
+    BoxedSlice<T>,
+    seq,
+    Vec::with_capacity(utils::size_hint_cautious(seq.size_hint())),
+    push
+);
+seq_impl!(BTreeSet<T: Ord>, seq, BTreeSet::new(), insert);
+seq_impl!(
+    HashSet<T: Eq + Hash, S: BuildHasher + Default>,
+    seq,
+    HashSet::with_capacity_and_hasher(utils::size_hint_cautious(seq.size_hint()), S::default()),
+    insert
+);
+seq_impl!(LinkedList<T>, seq, LinkedList::new(), push_back);
+seq_impl!(
+    Vec<T>,
+    seq,
+    Vec::with_capacity(utils::size_hint_cautious(seq.size_hint())),
+    push
+);
+seq_impl!(
+    VecDeque<T>,
+    seq,
+    VecDeque::with_capacity(utils::size_hint_cautious(seq.size_hint())),
+    push_back
+);
+#[cfg(feature = "indexmap")]
+seq_impl!(
+    IndexSet<T: Eq + Hash, S: BuildHasher + Default>,
+    seq,
+    IndexSet::with_capacity_and_hasher(utils::size_hint_cautious(seq.size_hint()), S::default()),
+    insert
+);
+
+macro_rules! map_impl {
+    (
+        $ty:ident < K $(: $kbound1:ident $(+ $kbound2:ident)*)*, V $(, $typaram:ident : $bound1:ident $(+ $bound2:ident)*)* >,
+        // We need an external name, such that we can use it in the `with_capacity` expression
+        $access:ident,
+        $with_capacity:expr
+    ) => {
+        // Fix for clippy regression in macros on stable
+        // The bug no longer exists on nightly
+        // https://github.com/rust-lang/rust-clippy/issues/7768
+        #[allow(clippy::semicolon_if_nothing_returned)]
+        impl<'de, K, V, KU, VU $(, $typaram)*> DeserializeAs<'de, $ty<K, V $(, $typaram)*>> for $ty<KU, VU $(, $typaram)*>
+        where
+            KU: DeserializeAs<'de, K>,
+            VU: DeserializeAs<'de, V>,
+            $(K: $kbound1 $(+ $kbound2)*,)*
+            $($typaram: $bound1 $(+ $bound2)*),*
+        {
+            fn deserialize_as<D>(deserializer: D) -> Result<$ty<K, V $(, $typaram)*>, D::Error>
+            where
+                D: Deserializer<'de>,
+            {
+                struct MapVisitor<K, V, KU, VU $(, $typaram)*> {
+                    marker: PhantomData<$ty<K, V $(, $typaram)*>>,
+                    marker2: PhantomData<$ty<KU, VU $(, $typaram)*>>,
+                }
+
+                impl<'de, K, V, KU, VU $(, $typaram)*> Visitor<'de> for MapVisitor<K, V, KU, VU $(, $typaram)*>
+                where
+                        KU: DeserializeAs<'de, K>,
+                        VU: DeserializeAs<'de, V>,
+                        $(K: $kbound1 $(+ $kbound2)*,)*
+                        $($typaram: $bound1 $(+ $bound2)*),*
+                {
+                    type Value = $ty<K, V $(, $typaram)*>;
+
+                    fn expecting(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
+                        formatter.write_str("a map")
+                    }
+
+                    #[inline]
+                    fn visit_map<A>(self, mut $access: A) -> Result<Self::Value, A::Error>
+                    where
+                        A: MapAccess<'de>,
+                    {
+                        let mut values = $with_capacity;
+
+                        while let Some((key, value)) = ($access.next_entry())?.map(|(k, v): (DeserializeAsWrap::<K, KU>, DeserializeAsWrap::<V, VU>)| (k.into_inner(), v.into_inner())) {
+                            values.insert(key, value);
+                        }
+
+                        Ok(values)
+                    }
+                }
+
+                let visitor = MapVisitor::<K, V, KU, VU $(, $typaram)*> { marker: PhantomData, marker2: PhantomData };
+                deserializer.deserialize_map(visitor)
+            }
+        }
+    }
+}
+
+map_impl!(
+    BTreeMap<K: Ord, V>,
+    map,
+    BTreeMap::new());
+map_impl!(
+    HashMap<K: Eq + Hash, V, S: BuildHasher + Default>,
+    map,
+    HashMap::with_capacity_and_hasher(utils::size_hint_cautious(map.size_hint()), S::default()));
+#[cfg(feature = "indexmap")]
+map_impl!(
+    IndexMap<K: Eq + Hash, V, S: BuildHasher + Default>,
+    map,
+    IndexMap::with_capacity_and_hasher(utils::size_hint_cautious(map.size_hint()), S::default()));
+
+macro_rules! tuple_impl {
+    ($len:literal $($n:tt $t:ident $tas:ident)+) => {
+        impl<'de, $($t, $tas,)+> DeserializeAs<'de, ($($t,)+)> for ($($tas,)+)
+        where
+            $($tas: DeserializeAs<'de, $t>,)+
+        {
+            fn deserialize_as<D>(deserializer: D) -> Result<($($t,)+), D::Error>
+            where
+                D: Deserializer<'de>,
+            {
+                struct TupleVisitor<$($t,)+>(PhantomData<($($t,)+)>);
+
+                impl<'de, $($t, $tas,)+> Visitor<'de>
+                    for TupleVisitor<$(DeserializeAsWrap<$t, $tas>,)+>
+                where
+                    $($tas: DeserializeAs<'de, $t>,)+
+                {
+                    type Value = ($($t,)+);
+
+                    fn expecting(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
+                        formatter.write_str(concat!("a tuple of size ", $len))
+                    }
+
+                    #[allow(non_snake_case)]
+                    fn visit_seq<A>(self, mut seq: A) -> Result<Self::Value, A::Error>
+                    where
+                        A: SeqAccess<'de>,
+                    {
+                        $(
+                            let $t: DeserializeAsWrap<$t, $tas> = match seq.next_element()? {
+                                Some(value) => value,
+                                None => return Err(Error::invalid_length($n, &self)),
+                            };
+                        )+
+
+                        Ok(($($t.into_inner(),)+))
+                    }
+                }
+
+                deserializer.deserialize_tuple(
+                    $len,
+                    TupleVisitor::<$(DeserializeAsWrap<$t, $tas>,)+>(PhantomData),
+                )
+            }
+        }
+    };
+}
+
+tuple_impl!(1 0 T0 As0);
+tuple_impl!(2 0 T0 As0 1 T1 As1);
+tuple_impl!(3 0 T0 As0 1 T1 As1 2 T2 As2);
+tuple_impl!(4 0 T0 As0 1 T1 As1 2 T2 As2 3 T3 As3);
+tuple_impl!(5 0 T0 As0 1 T1 As1 2 T2 As2 3 T3 As3 4 T4 As4);
+tuple_impl!(6 0 T0 As0 1 T1 As1 2 T2 As2 3 T3 As3 4 T4 As4 5 T5 As5);
+tuple_impl!(7 0 T0 As0 1 T1 As1 2 T2 As2 3 T3 As3 4 T4 As4 5 T5 As5 6 T6 As6);
+tuple_impl!(8 0 T0 As0 1 T1 As1 2 T2 As2 3 T3 As3 4 T4 As4 5 T5 As5 6 T6 As6 7 T7 As7);
+tuple_impl!(9 0 T0 As0 1 T1 As1 2 T2 As2 3 T3 As3 4 T4 As4 5 T5 As5 6 T6 As6 7 T7 As7 8 T8 As8);
+tuple_impl!(10 0 T0 As0 1 T1 As1 2 T2 As2 3 T3 As3 4 T4 As4 5 T5 As5 6 T6 As6 7 T7 As7 8 T8 As8 9 T9 As9);
+tuple_impl!(11 0 T0 As0 1 T1 As1 2 T2 As2 3 T3 As3 4 T4 As4 5 T5 As5 6 T6 As6 7 T7 As7 8 T8 As8 9 T9 As9 10 T10 As10);
+tuple_impl!(12 0 T0 As0 1 T1 As1 2 T2 As2 3 T3 As3 4 T4 As4 5 T5 As5 6 T6 As6 7 T7 As7 8 T8 As8 9 T9 As9 10 T10 As10 11 T11 As11);
+tuple_impl!(13 0 T0 As0 1 T1 As1 2 T2 As2 3 T3 As3 4 T4 As4 5 T5 As5 6 T6 As6 7 T7 As7 8 T8 As8 9 T9 As9 10 T10 As10 11 T11 As11 12 T12 As12);
+tuple_impl!(14 0 T0 As0 1 T1 As1 2 T2 As2 3 T3 As3 4 T4 As4 5 T5 As5 6 T6 As6 7 T7 As7 8 T8 As8 9 T9 As9 10 T10 As10 11 T11 As11 12 T12 As12 13 T13 As13);
+tuple_impl!(15 0 T0 As0 1 T1 As1 2 T2 As2 3 T3 As3 4 T4 As4 5 T5 As5 6 T6 As6 7 T7 As7 8 T8 As8 9 T9 As9 10 T10 As10 11 T11 As11 12 T12 As12 13 T13 As13 14 T14 As14);
+tuple_impl!(16 0 T0 As0 1 T1 As1 2 T2 As2 3 T3 As3 4 T4 As4 5 T5 As5 6 T6 As6 7 T7 As7 8 T8 As8 9 T9 As9 10 T10 As10 11 T11 As11 12 T12 As12 13 T13 As13 14 T14 As14 15 T15 As15);
+
+macro_rules! map_as_tuple_seq {
+    ($ty:ident < K $(: $kbound1:ident $(+ $kbound2:ident)*)*, V>) => {
+        impl<'de, K, KAs, V, VAs> DeserializeAs<'de, $ty<K, V>> for Vec<(KAs, VAs)>
+        where
+            KAs: DeserializeAs<'de, K>,
+            VAs: DeserializeAs<'de, V>,
+            $(K: $kbound1 $(+ $kbound2)*,)*
+        {
+            fn deserialize_as<D>(deserializer: D) -> Result<$ty<K, V>, D::Error>
+            where
+                D: Deserializer<'de>,
+            {
+                struct SeqVisitor<K, KAs, V, VAs> {
+                    marker: PhantomData<(K, KAs, V, VAs)>,
+                }
+
+                impl<'de, K, KAs, V, VAs> Visitor<'de> for SeqVisitor<K, KAs, V, VAs>
+                where
+                    KAs: DeserializeAs<'de, K>,
+                    VAs: DeserializeAs<'de, V>,
+                    $(K: $kbound1 $(+ $kbound2)*,)*
+                {
+                    type Value = $ty<K, V>;
+
+                    fn expecting(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
+                        formatter.write_str("a sequence")
+                    }
+
+                    #[inline]
+                    fn visit_seq<A>(self, access: A) -> Result<Self::Value, A::Error>
+                    where
+                        A: SeqAccess<'de>,
+                    {
+                        let iter = utils::SeqIter::new(access);
+                        iter.map(|res| {
+                            res.map(
+                                |(k, v): (DeserializeAsWrap<K, KAs>, DeserializeAsWrap<V, VAs>)| {
+                                    (k.into_inner(), v.into_inner())
+                                },
+                            )
+                        })
+                        .collect()
+                    }
+                }
+
+                let visitor = SeqVisitor::<K, KAs, V, VAs> {
+                    marker: PhantomData,
+                };
+                deserializer.deserialize_seq(visitor)
+            }
+        }
+    };
+}
+map_as_tuple_seq!(BTreeMap<K: Ord, V>);
+map_as_tuple_seq!(HashMap<K: Eq + Hash, V>);
+#[cfg(feature = "indexmap")]
+map_as_tuple_seq!(IndexMap<K: Eq + Hash, V>);
+
+// endregion
+///////////////////////////////////////////////////////////////////////////////
+// region: Conversion types which cause different serialization behavior
+
+impl<'de, T: Deserialize<'de>> DeserializeAs<'de, T> for Same {
+    fn deserialize_as<D>(deserializer: D) -> Result<T, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        T::deserialize(deserializer)
+    }
+}
+
+impl<'de, T> DeserializeAs<'de, T> for DisplayFromStr
+where
+    T: FromStr,
+    T::Err: Display,
+{
+    fn deserialize_as<D>(deserializer: D) -> Result<T, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        crate::rust::display_fromstr::deserialize(deserializer)
+    }
+}
+
+impl<'de, T, U> DeserializeAs<'de, Vec<T>> for VecSkipError<U>
+where
+    U: DeserializeAs<'de, T>,
+{
+    fn deserialize_as<D>(deserializer: D) -> Result<Vec<T>, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        #[derive(serde::Deserialize)]
+        #[serde(
+            untagged,
+            bound(deserialize = "DeserializeAsWrap<T, TAs>: Deserialize<'de>")
+        )]
+        enum GoodOrError<'a, T, TAs>
+        where
+            TAs: DeserializeAs<'a, T>,
+        {
+            Good(DeserializeAsWrap<T, TAs>),
+            // This consumes one "item" when `T` errors while deserializing.
+            // This is necessary to make this work, when instead of having a direct value
+            // like integer or string, the deserializer sees a list or map.
+            Error(IgnoredAny),
+            #[serde(skip)]
+            _JustAMarkerForTheLifetime(PhantomData<&'a u32>),
+        }
+
+        struct SeqVisitor<T, U> {
+            marker: PhantomData<T>,
+            marker2: PhantomData<U>,
+        }
+
+        impl<'de, T, U> Visitor<'de> for SeqVisitor<T, U>
+        where
+            U: DeserializeAs<'de, T>,
+        {
+            type Value = Vec<T>;
+
+            fn expecting(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
+                formatter.write_str("a sequence")
+            }
+
+            fn visit_seq<A>(self, mut seq: A) -> Result<Self::Value, A::Error>
+            where
+                A: SeqAccess<'de>,
+            {
+                let mut values = Vec::with_capacity(seq.size_hint().unwrap_or_default());
+
+                while let Some(value) = seq.next_element()? {
+                    if let GoodOrError::<T, U>::Good(value) = value {
+                        values.push(value.into_inner());
+                    }
+                }
+                Ok(values)
+            }
+        }
+
+        let visitor = SeqVisitor::<T, U> {
+            marker: PhantomData,
+            marker2: PhantomData,
+        };
+        deserializer.deserialize_seq(visitor)
+    }
+}
+
+impl<'de, Str> DeserializeAs<'de, Option<Str>> for NoneAsEmptyString
+where
+    Str: FromStr,
+    Str::Err: Display,
+{
+    fn deserialize_as<D>(deserializer: D) -> Result<Option<Str>, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        crate::rust::string_empty_as_none::deserialize(deserializer)
+    }
+}
+
+macro_rules! tuple_seq_as_map_impl_intern {
+    ($tyorig:ident < (K $(: $($kbound:ident $(+)?)+)?, V $(: $($vbound:ident $(+)?)+)?)>, $ty:ident <KAs, VAs>) => {
+        #[allow(clippy::implicit_hasher)]
+        impl<'de, K, KAs, V, VAs> DeserializeAs<'de, $tyorig < (K, V) >> for $ty<KAs, VAs>
+        where
+            KAs: DeserializeAs<'de, K>,
+            VAs: DeserializeAs<'de, V>,
+            K: $($($kbound +)*)*,
+            V: $($($vbound +)*)*,
+        {
+            fn deserialize_as<D>(deserializer: D) -> Result<$tyorig < (K, V) >, D::Error>
+            where
+                D: Deserializer<'de>,
+            {
+                struct MapVisitor<K, KAs, V, VAs> {
+                    marker: PhantomData<(K, KAs, V, VAs)>,
+                }
+
+                impl<'de, K, KAs, V, VAs> Visitor<'de> for MapVisitor<K, KAs, V, VAs>
+                where
+                    KAs: DeserializeAs<'de, K>,
+                    VAs: DeserializeAs<'de, V>,
+                    K: $($($kbound +)*)*,
+                    V: $($($vbound +)*)*,
+                {
+                    type Value = $tyorig < (K, V) >;
+
+                    fn expecting(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
+                        formatter.write_str("a map")
+                    }
+
+                    #[inline]
+                    fn visit_map<A>(self, access: A) -> Result<Self::Value, A::Error>
+                    where
+                        A: MapAccess<'de>,
+                    {
+                        let iter = utils::MapIter::new(access);
+                        iter.map(|res| {
+                            res.map(
+                                |(k, v): (DeserializeAsWrap<K, KAs>, DeserializeAsWrap<V, VAs>)| {
+                                    (k.into_inner(), v.into_inner())
+                                },
+                            )
+                        })
+                        .collect()
+                    }
+                }
+
+                let visitor = MapVisitor::<K, KAs, V, VAs> {
+                    marker: PhantomData,
+                };
+                deserializer.deserialize_map(visitor)
+            }
+        }
+    }
+}
+macro_rules! tuple_seq_as_map_impl {
+    ($($tyorig:ident < (K $(: $($kbound:ident $(+)?)+)?, V $(: $($vbound:ident $(+)?)+)?)> $(,)?)+) => {$(
+        tuple_seq_as_map_impl_intern!($tyorig < (K $(: $($kbound +)+)?, V $(: $($vbound +)+)?) >, BTreeMap<KAs, VAs>);
+        tuple_seq_as_map_impl_intern!($tyorig < (K $(: $($kbound +)+)?, V $(: $($vbound +)+)?) >, HashMap<KAs, VAs>);
+    )+}
+}
+
+tuple_seq_as_map_impl! {
+    BinaryHeap<(K: Ord, V: Ord)>,
+    BTreeSet<(K: Ord, V: Ord)>,
+    LinkedList<(K, V)>,
+    Vec<(K, V)>,
+    VecDeque<(K, V)>,
+}
+tuple_seq_as_map_impl!(HashSet<(K: Eq + Hash, V: Eq + Hash)>);
+#[cfg(feature = "indexmap")]
+tuple_seq_as_map_impl!(IndexSet<(K: Eq + Hash, V: Eq + Hash)>);
+
+macro_rules! tuple_seq_as_map_option_impl {
+    ($($ty:ident $(,)?)+) => {$(
+        #[allow(clippy::implicit_hasher)]
+        impl<'de, K, KAs, V, VAs> DeserializeAs<'de, Option<(K, V)>> for $ty<KAs, VAs>
+        where
+            KAs: DeserializeAs<'de, K>,
+            VAs: DeserializeAs<'de, V>,
+        {
+            fn deserialize_as<D>(deserializer: D) -> Result<Option<(K, V)>, D::Error>
+            where
+                D: Deserializer<'de>,
+            {
+                struct MapVisitor<K, KAs, V, VAs> {
+                    marker: PhantomData<(K, KAs, V, VAs)>,
+                }
+
+                impl<'de, K, KAs, V, VAs> Visitor<'de> for MapVisitor<K, KAs, V, VAs>
+                where
+                    KAs: DeserializeAs<'de, K>,
+                    VAs: DeserializeAs<'de, V>,
+                {
+                    type Value = Option<(K, V)>;
+
+                    fn expecting(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
+                        formatter.write_str("a map of size 1")
+                    }
+
+                    #[inline]
+                    fn visit_map<A>(self, access: A) -> Result<Self::Value, A::Error>
+                    where
+                        A: MapAccess<'de>,
+                    {
+                        let iter = utils::MapIter::new(access);
+                        iter.map(|res| {
+                            res.map(
+                                |(k, v): (DeserializeAsWrap<K, KAs>, DeserializeAsWrap<V, VAs>)| {
+                                    (k.into_inner(), v.into_inner())
+                                },
+                            )
+                        })
+                        .next()
+                        .transpose()
+                    }
+                }
+
+                let visitor = MapVisitor::<K, KAs, V, VAs> {
+                    marker: PhantomData,
+                };
+                deserializer.deserialize_map(visitor)
+            }
+        }
+    )+}
+}
+tuple_seq_as_map_option_impl!(BTreeMap);
+tuple_seq_as_map_option_impl!(HashMap);
+
+impl<'de, T, TAs> DeserializeAs<'de, T> for DefaultOnError<TAs>
+where
+    TAs: DeserializeAs<'de, T>,
+    T: Default,
+{
+    fn deserialize_as<D>(deserializer: D) -> Result<T, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        #[derive(serde::Deserialize)]
+        #[serde(
+            untagged,
+            bound(deserialize = "DeserializeAsWrap<T, TAs>: Deserialize<'de>")
+        )]
+        enum GoodOrError<'a, T, TAs>
+        where
+            TAs: DeserializeAs<'a, T>,
+        {
+            Good(DeserializeAsWrap<T, TAs>),
+            // This consumes one "item" when `T` errors while deserializing.
+            // This is necessary to make this work, when instead of having a direct value
+            // like integer or string, the deserializer sees a list or map.
+            Error(IgnoredAny),
+            #[serde(skip)]
+            _JustAMarkerForTheLifetime(PhantomData<&'a u32>),
+        }
+
+        Ok(match Deserialize::deserialize(deserializer) {
+            Ok(GoodOrError::<T, TAs>::Good(res)) => res.into_inner(),
+            _ => Default::default(),
+        })
+    }
+}
+
+impl<'de> DeserializeAs<'de, Vec<u8>> for BytesOrString {
+    fn deserialize_as<D>(deserializer: D) -> Result<Vec<u8>, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        crate::rust::bytes_or_string::deserialize(deserializer)
+    }
+}
+
+impl<'de, SEPARATOR, I, T> DeserializeAs<'de, I> for StringWithSeparator<SEPARATOR, T>
+where
+    SEPARATOR: Separator,
+    I: FromIterator<T>,
+    T: FromStr,
+    T::Err: Display,
+{
+    fn deserialize_as<D>(deserializer: D) -> Result<I, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        let s = String::deserialize(deserializer)?;
+        if s.is_empty() {
+            Ok(None.into_iter().collect())
+        } else {
+            s.split(SEPARATOR::separator())
+                .map(FromStr::from_str)
+                .collect::<Result<_, _>>()
+                .map_err(Error::custom)
+        }
+    }
+}
+
+macro_rules! use_signed_duration {
+    (
+        $main_trait:ident $internal_trait:ident =>
+        {
+            $ty:ty; $converter:ident =>
+            $({
+                $format:ty, $strictness:ty =>
+                $($tbound:ident: $bound:ident $(,)?)*
+            })*
+        }
+    ) => {
+        $(
+            impl<'de, $($tbound,)*> DeserializeAs<'de, $ty> for $main_trait<$format, $strictness>
+            where
+                $($tbound: $bound,)*
+            {
+                fn deserialize_as<D>(deserializer: D) -> Result<$ty, D::Error>
+                where
+                    D: Deserializer<'de>,
+                {
+                    let dur: DurationSigned = $internal_trait::<$format, $strictness>::deserialize_as(deserializer)?;
+                    dur.$converter::<D>()
+                }
+            }
+        )*
+    };
+    (
+        $( $main_trait:ident $internal_trait:ident, )+ => $rest:tt
+    ) => {
+        $( use_signed_duration!($main_trait $internal_trait => $rest); )+
+    };
+}
+
+use_signed_duration!(
+    DurationSeconds DurationSeconds,
+    DurationMilliSeconds DurationMilliSeconds,
+    DurationMicroSeconds DurationMicroSeconds,
+    DurationNanoSeconds DurationNanoSeconds,
+    => {
+        Duration; to_std_duration =>
+        {u64, Strict =>}
+        {f64, Strict =>}
+        {String, Strict =>}
+        {FORMAT, Flexible => FORMAT: Format}
+    }
+);
+use_signed_duration!(
+    DurationSecondsWithFrac DurationSecondsWithFrac,
+    DurationMilliSecondsWithFrac DurationMilliSecondsWithFrac,
+    DurationMicroSecondsWithFrac DurationMicroSecondsWithFrac,
+    DurationNanoSecondsWithFrac DurationNanoSecondsWithFrac,
+    => {
+        Duration; to_std_duration =>
+        {f64, Strict =>}
+        {String, Strict =>}
+        {FORMAT, Flexible => FORMAT: Format}
+    }
+);
+
+use_signed_duration!(
+    TimestampSeconds DurationSeconds,
+    TimestampMilliSeconds DurationMilliSeconds,
+    TimestampMicroSeconds DurationMicroSeconds,
+    TimestampNanoSeconds DurationNanoSeconds,
+    => {
+        SystemTime; to_system_time =>
+        {i64, Strict =>}
+        {f64, Strict =>}
+        {String, Strict =>}
+        {FORMAT, Flexible => FORMAT: Format}
+    }
+);
+use_signed_duration!(
+    TimestampSecondsWithFrac DurationSecondsWithFrac,
+    TimestampMilliSecondsWithFrac DurationMilliSecondsWithFrac,
+    TimestampMicroSecondsWithFrac DurationMicroSecondsWithFrac,
+    TimestampNanoSecondsWithFrac DurationNanoSecondsWithFrac,
+    => {
+        SystemTime; to_system_time =>
+        {f64, Strict =>}
+        {String, Strict =>}
+        {FORMAT, Flexible => FORMAT: Format}
+    }
+);
+
+impl<'de, T, U> DeserializeAs<'de, T> for DefaultOnNull<U>
+where
+    U: DeserializeAs<'de, T>,
+    T: Default,
+{
+    fn deserialize_as<D>(deserializer: D) -> Result<T, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        Ok(Option::<U>::deserialize_as(deserializer)?.unwrap_or_default())
+    }
+}
+
+impl<'de> DeserializeAs<'de, &'de [u8]> for Bytes {
+    fn deserialize_as<D>(deserializer: D) -> Result<&'de [u8], D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        <&'de [u8]>::deserialize(deserializer)
+    }
+}
+
+// serde_bytes implementation for ByteBuf
+// https://github.com/serde-rs/bytes/blob/cbae606b9dc225fc094b031cc84eac9493da2058/src/bytebuf.rs#L196
+//
+// Implements:
+// * visit_seq
+// * visit_bytes
+// * visit_byte_buf
+// * visit_str
+// * visit_string
+impl<'de> DeserializeAs<'de, Vec<u8>> for Bytes {
+    fn deserialize_as<D>(deserializer: D) -> Result<Vec<u8>, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        struct VecVisitor;
+
+        impl<'de> Visitor<'de> for VecVisitor {
+            type Value = Vec<u8>;
+
+            fn expecting(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
+                formatter.write_str("a byte array")
+            }
+
+            fn visit_seq<A>(self, seq: A) -> Result<Self::Value, A::Error>
+            where
+                A: SeqAccess<'de>,
+            {
+                utils::SeqIter::new(seq).collect::<Result<_, _>>()
+            }
+
+            fn visit_bytes<E>(self, v: &[u8]) -> Result<Self::Value, E>
+            where
+                E: Error,
+            {
+                Ok(v.to_vec())
+            }
+
+            fn visit_byte_buf<E>(self, v: Vec<u8>) -> Result<Self::Value, E>
+            where
+                E: Error,
+            {
+                Ok(v)
+            }
+
+            fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
+            where
+                E: Error,
+            {
+                Ok(v.as_bytes().to_vec())
+            }
+
+            fn visit_string<E>(self, v: String) -> Result<Self::Value, E>
+            where
+                E: Error,
+            {
+                Ok(v.into_bytes())
+            }
+        }
+
+        deserializer.deserialize_byte_buf(VecVisitor)
+    }
+}
+
+impl<'de> DeserializeAs<'de, Box<[u8]>> for Bytes {
+    fn deserialize_as<D>(deserializer: D) -> Result<Box<[u8]>, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        <Bytes as DeserializeAs<'de, Vec<u8>>>::deserialize_as(deserializer)
+            .map(|vec| vec.into_boxed_slice())
+    }
+}
+
+// serde_bytes implementation for Cow<'a, [u8]>
+// https://github.com/serde-rs/bytes/blob/cbae606b9dc225fc094b031cc84eac9493da2058/src/de.rs#L77
+//
+// Implements:
+// * visit_borrowed_bytes
+// * visit_borrowed_str
+// * visit_bytes
+// * visit_str
+// * visit_byte_buf
+// * visit_string
+// * visit_seq
+impl<'de> DeserializeAs<'de, Cow<'de, [u8]>> for Bytes {
+    fn deserialize_as<D>(deserializer: D) -> Result<Cow<'de, [u8]>, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        struct CowVisitor;
+
+        impl<'de> Visitor<'de> for CowVisitor {
+            type Value = Cow<'de, [u8]>;
+
+            fn expecting(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
+                formatter.write_str("a byte array")
+            }
+
+            fn visit_borrowed_bytes<E>(self, v: &'de [u8]) -> Result<Self::Value, E>
+            where
+                E: Error,
+            {
+                Ok(Cow::Borrowed(v))
+            }
+
+            fn visit_borrowed_str<E>(self, v: &'de str) -> Result<Self::Value, E>
+            where
+                E: Error,
+            {
+                Ok(Cow::Borrowed(v.as_bytes()))
+            }
+
+            fn visit_bytes<E>(self, v: &[u8]) -> Result<Self::Value, E>
+            where
+                E: Error,
+            {
+                Ok(Cow::Owned(v.to_vec()))
+            }
+
+            fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
+            where
+                E: Error,
+            {
+                Ok(Cow::Owned(v.as_bytes().to_vec()))
+            }
+
+            fn visit_byte_buf<E>(self, v: Vec<u8>) -> Result<Self::Value, E>
+            where
+                E: Error,
+            {
+                Ok(Cow::Owned(v))
+            }
+
+            fn visit_string<E>(self, v: String) -> Result<Self::Value, E>
+            where
+                E: Error,
+            {
+                Ok(Cow::Owned(v.into_bytes()))
+            }
+
+            fn visit_seq<V>(self, seq: V) -> Result<Self::Value, V::Error>
+            where
+                V: SeqAccess<'de>,
+            {
+                Ok(Cow::Owned(
+                    utils::SeqIter::new(seq).collect::<Result<_, _>>()?,
+                ))
+            }
+        }
+
+        deserializer.deserialize_bytes(CowVisitor)
+    }
+}
+
+impl<'de, T, U, FORMAT> DeserializeAs<'de, Vec<T>> for OneOrMany<U, FORMAT>
+where
+    U: DeserializeAs<'de, T>,
+    FORMAT: Format,
+{
+    fn deserialize_as<D>(deserializer: D) -> Result<Vec<T>, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        #[derive(serde::Deserialize)]
+        #[serde(
+            untagged,
+            bound(deserialize = r#"DeserializeAsWrap<T, U>: Deserialize<'de>,
+                DeserializeAsWrap<Vec<T>, Vec<U>>: Deserialize<'de>"#),
+            expecting = "a list or single element"
+        )]
+        enum Helper<'a, T, U>
+        where
+            U: DeserializeAs<'a, T>,
+        {
+            One(DeserializeAsWrap<T, U>),
+            Many(DeserializeAsWrap<Vec<T>, Vec<U>>),
+            #[serde(skip)]
+            _JustAMarkerForTheLifetime(PhantomData<&'a u32>),
+        }
+
+        let h: Helper<'de, T, U> = Deserialize::deserialize(deserializer)?;
+        match h {
+            Helper::One(one) => Ok(alloc::vec![one.into_inner()]),
+            Helper::Many(many) => Ok(many.into_inner()),
+            Helper::_JustAMarkerForTheLifetime(_) => unreachable!(),
+        }
+    }
+}
+
+impl<'de, T, TAs1> DeserializeAs<'de, T> for PickFirst<(TAs1,)>
+where
+    TAs1: DeserializeAs<'de, T>,
+{
+    fn deserialize_as<D>(deserializer: D) -> Result<T, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        Ok(DeserializeAsWrap::<T, TAs1>::deserialize(deserializer)?.into_inner())
+    }
+}
+
+impl<'de, T, TAs1, TAs2> DeserializeAs<'de, T> for PickFirst<(TAs1, TAs2)>
+where
+    TAs1: DeserializeAs<'de, T>,
+    TAs2: DeserializeAs<'de, T>,
+{
+    fn deserialize_as<D>(deserializer: D) -> Result<T, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        #[derive(serde::Deserialize)]
+        #[serde(
+            untagged,
+            bound(deserialize = r#"
+                DeserializeAsWrap<T, TAs1>: Deserialize<'de>,
+                DeserializeAsWrap<T, TAs2>: Deserialize<'de>,
+            "#),
+            expecting = "PickFirst could not deserialize data"
+        )]
+        enum Helper<'a, T, TAs1, TAs2>
+        where
+            TAs1: DeserializeAs<'a, T>,
+            TAs2: DeserializeAs<'a, T>,
+        {
+            First(DeserializeAsWrap<T, TAs1>),
+            Second(DeserializeAsWrap<T, TAs2>),
+            #[serde(skip)]
+            _JustAMarkerForTheLifetime(PhantomData<&'a u32>),
+        }
+
+        let h: Helper<'de, T, TAs1, TAs2> = Deserialize::deserialize(deserializer)?;
+        match h {
+            Helper::First(first) => Ok(first.into_inner()),
+            Helper::Second(second) => Ok(second.into_inner()),
+            Helper::_JustAMarkerForTheLifetime(_) => unreachable!(),
+        }
+    }
+}
+
+impl<'de, T, TAs1, TAs2, TAs3> DeserializeAs<'de, T> for PickFirst<(TAs1, TAs2, TAs3)>
+where
+    TAs1: DeserializeAs<'de, T>,
+    TAs2: DeserializeAs<'de, T>,
+    TAs3: DeserializeAs<'de, T>,
+{
+    fn deserialize_as<D>(deserializer: D) -> Result<T, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        #[derive(serde::Deserialize)]
+        #[serde(
+            untagged,
+            bound(deserialize = r#"
+                DeserializeAsWrap<T, TAs1>: Deserialize<'de>,
+                DeserializeAsWrap<T, TAs2>: Deserialize<'de>,
+                DeserializeAsWrap<T, TAs3>: Deserialize<'de>,
+            "#),
+            expecting = "PickFirst could not deserialize data"
+        )]
+        enum Helper<'a, T, TAs1, TAs2, TAs3>
+        where
+            TAs1: DeserializeAs<'a, T>,
+            TAs2: DeserializeAs<'a, T>,
+            TAs3: DeserializeAs<'a, T>,
+        {
+            First(DeserializeAsWrap<T, TAs1>),
+            Second(DeserializeAsWrap<T, TAs2>),
+            Third(DeserializeAsWrap<T, TAs3>),
+            #[serde(skip)]
+            _JustAMarkerForTheLifetime(PhantomData<&'a u32>),
+        }
+
+        let h: Helper<'de, T, TAs1, TAs2, TAs3> = Deserialize::deserialize(deserializer)?;
+        match h {
+            Helper::First(first) => Ok(first.into_inner()),
+            Helper::Second(second) => Ok(second.into_inner()),
+            Helper::Third(third) => Ok(third.into_inner()),
+            Helper::_JustAMarkerForTheLifetime(_) => unreachable!(),
+        }
+    }
+}
+
+impl<'de, T, TAs1, TAs2, TAs3, TAs4> DeserializeAs<'de, T> for PickFirst<(TAs1, TAs2, TAs3, TAs4)>
+where
+    TAs1: DeserializeAs<'de, T>,
+    TAs2: DeserializeAs<'de, T>,
+    TAs3: DeserializeAs<'de, T>,
+    TAs4: DeserializeAs<'de, T>,
+{
+    fn deserialize_as<D>(deserializer: D) -> Result<T, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        #[derive(serde::Deserialize)]
+        #[serde(
+            untagged,
+            bound(deserialize = r#"
+                DeserializeAsWrap<T, TAs1>: Deserialize<'de>,
+                DeserializeAsWrap<T, TAs2>: Deserialize<'de>,
+                DeserializeAsWrap<T, TAs3>: Deserialize<'de>,
+                DeserializeAsWrap<T, TAs4>: Deserialize<'de>,
+            "#),
+            expecting = "PickFirst could not deserialize data"
+        )]
+        enum Helper<'a, T, TAs1, TAs2, TAs3, TAs4>
+        where
+            TAs1: DeserializeAs<'a, T>,
+            TAs2: DeserializeAs<'a, T>,
+            TAs3: DeserializeAs<'a, T>,
+            TAs4: DeserializeAs<'a, T>,
+        {
+            First(DeserializeAsWrap<T, TAs1>),
+            Second(DeserializeAsWrap<T, TAs2>),
+            Third(DeserializeAsWrap<T, TAs3>),
+            Forth(DeserializeAsWrap<T, TAs4>),
+            #[serde(skip)]
+            _JustAMarkerForTheLifetime(PhantomData<&'a u32>),
+        }
+
+        let h: Helper<'de, T, TAs1, TAs2, TAs3, TAs4> = Deserialize::deserialize(deserializer)?;
+        match h {
+            Helper::First(first) => Ok(first.into_inner()),
+            Helper::Second(second) => Ok(second.into_inner()),
+            Helper::Third(third) => Ok(third.into_inner()),
+            Helper::Forth(forth) => Ok(forth.into_inner()),
+            Helper::_JustAMarkerForTheLifetime(_) => unreachable!(),
+        }
+    }
+}
+
+impl<'de, T, U> DeserializeAs<'de, T> for FromInto<U>
+where
+    U: Into<T>,
+    U: Deserialize<'de>,
+{
+    fn deserialize_as<D>(deserializer: D) -> Result<T, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        Ok(U::deserialize(deserializer)?.into())
+    }
+}
+
+impl<'de, T, U> DeserializeAs<'de, T> for TryFromInto<U>
+where
+    U: TryInto<T>,
+    <U as TryInto<T>>::Error: Display,
+    U: Deserialize<'de>,
+{
+    fn deserialize_as<D>(deserializer: D) -> Result<T, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        U::deserialize(deserializer)?
+            .try_into()
+            .map_err(Error::custom)
+    }
+}
+
+impl<'de> DeserializeAs<'de, Cow<'de, str>> for BorrowCow {
+    fn deserialize_as<D>(deserializer: D) -> Result<Cow<'de, str>, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        struct CowVisitor;
+
+        impl<'de> Visitor<'de> for CowVisitor {
+            type Value = Cow<'de, str>;
+
+            fn expecting(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
+                formatter.write_str("an optionally borrowed string")
+            }
+
+            fn visit_borrowed_str<E>(self, v: &'de str) -> Result<Self::Value, E>
+            where
+                E: Error,
+            {
+                Ok(Cow::Borrowed(v))
+            }
+
+            fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
+            where
+                E: Error,
+            {
+                Ok(Cow::Owned(v.to_owned()))
+            }
+
+            fn visit_string<E>(self, v: String) -> Result<Self::Value, E>
+            where
+                E: Error,
+            {
+                Ok(Cow::Owned(v))
+            }
+        }
+
+        deserializer.deserialize_str(CowVisitor)
+    }
+}
+
+impl<'de> DeserializeAs<'de, Cow<'de, [u8]>> for BorrowCow {
+    fn deserialize_as<D>(deserializer: D) -> Result<Cow<'de, [u8]>, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        Bytes::deserialize_as(deserializer)
+    }
+}
+
+impl<'de> DeserializeAs<'de, bool> for BoolFromInt<Strict> {
+    fn deserialize_as<D>(deserializer: D) -> Result<bool, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        struct U8Visitor;
+        impl<'de> Visitor<'de> for U8Visitor {
+            type Value = bool;
+
+            fn expecting(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
+                formatter.write_str("an integer 0 or 1")
+            }
+
+            fn visit_u8<E>(self, v: u8) -> Result<Self::Value, E>
+            where
+                E: Error,
+            {
+                match v {
+                    0 => Ok(false),
+                    1 => Ok(true),
+                    unexp => Err(Error::invalid_value(
+                        Unexpected::Unsigned(unexp as u64),
+                        &"0 or 1",
+                    )),
+                }
+            }
+
+            fn visit_i8<E>(self, v: i8) -> Result<Self::Value, E>
+            where
+                E: Error,
+            {
+                match v {
+                    0 => Ok(false),
+                    1 => Ok(true),
+                    unexp => Err(Error::invalid_value(
+                        Unexpected::Signed(unexp as i64),
+                        &"0 or 1",
+                    )),
+                }
+            }
+
+            fn visit_u64<E>(self, v: u64) -> Result<Self::Value, E>
+            where
+                E: Error,
+            {
+                match v {
+                    0 => Ok(false),
+                    1 => Ok(true),
+                    unexp => Err(Error::invalid_value(Unexpected::Unsigned(unexp), &"0 or 1")),
+                }
+            }
+
+            fn visit_i64<E>(self, v: i64) -> Result<Self::Value, E>
+            where
+                E: Error,
+            {
+                match v {
+                    0 => Ok(false),
+                    1 => Ok(true),
+                    unexp => Err(Error::invalid_value(Unexpected::Signed(unexp), &"0 or 1")),
+                }
+            }
+
+            fn visit_u128<E>(self, v: u128) -> Result<Self::Value, E>
+            where
+                E: Error,
+            {
+                match v {
+                    0 => Ok(false),
+                    1 => Ok(true),
+                    unexp => Err(Error::invalid_value(
+                        Unexpected::Unsigned(unexp as u64),
+                        &"0 or 1",
+                    )),
+                }
+            }
+
+            fn visit_i128<E>(self, v: i128) -> Result<Self::Value, E>
+            where
+                E: Error,
+            {
+                match v {
+                    0 => Ok(false),
+                    1 => Ok(true),
+                    unexp => Err(Error::invalid_value(
+                        Unexpected::Unsigned(unexp as u64),
+                        &"0 or 1",
+                    )),
+                }
+            }
+        }
+
+        deserializer.deserialize_u8(U8Visitor)
+    }
+}
+
+impl<'de> DeserializeAs<'de, bool> for BoolFromInt<Flexible> {
+    fn deserialize_as<D>(deserializer: D) -> Result<bool, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        struct U8Visitor;
+        impl<'de> Visitor<'de> for U8Visitor {
+            type Value = bool;
+
+            fn expecting(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
+                formatter.write_str("an integer")
+            }
+
+            fn visit_u8<E>(self, v: u8) -> Result<Self::Value, E>
+            where
+                E: Error,
+            {
+                Ok(v != 0)
+            }
+
+            fn visit_i8<E>(self, v: i8) -> Result<Self::Value, E>
+            where
+                E: Error,
+            {
+                Ok(v != 0)
+            }
+
+            fn visit_u64<E>(self, v: u64) -> Result<Self::Value, E>
+            where
+                E: Error,
+            {
+                Ok(v != 0)
+            }
+
+            fn visit_i64<E>(self, v: i64) -> Result<Self::Value, E>
+            where
+                E: Error,
+            {
+                Ok(v != 0)
+            }
+
+            fn visit_u128<E>(self, v: u128) -> Result<Self::Value, E>
+            where
+                E: Error,
+            {
+                Ok(v != 0)
+            }
+
+            fn visit_i128<E>(self, v: i128) -> Result<Self::Value, E>
+            where
+                E: Error,
+            {
+                Ok(v != 0)
+            }
+        }
+
+        deserializer.deserialize_u8(U8Visitor)
+    }
+}
+
+// endregion
diff --git a/third_party/rust/serde_with/src/de/legacy_arrays.rs b/third_party/rust/serde_with/src/de/legacy_arrays.rs
new file mode 100644
index 0000000000..550e444a2f
--- /dev/null
+++ b/third_party/rust/serde_with/src/de/legacy_arrays.rs
@@ -0,0 +1,85 @@
+use super::*;
+use core::fmt;
+use serde::de::*;
+
+macro_rules! array_impl {
+    ($len:literal $($idx:tt)*) => {
+        impl<'de, T, As> DeserializeAs<'de, [T; $len]> for [As; $len]
+        where
+            As: DeserializeAs<'de, T>,
+        {
+            fn deserialize_as<D>(deserializer: D) -> Result<[T; $len], D::Error>
+            where
+                D: Deserializer<'de>,
+            {
+                struct ArrayVisitor<T>(PhantomData<T>);
+
+                impl<'de, T, As> Visitor<'de>
+                    for ArrayVisitor<DeserializeAsWrap<T, As>>
+                where
+                    As: DeserializeAs<'de, T>,
+                {
+                    type Value = [T; $len];
+
+                    fn expecting(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
+                        formatter.write_str(concat!("an array of size ", $len))
+                    }
+
+                    #[allow(non_snake_case)]
+                    // Because of 0-size arrays
+                    #[allow(unused_variables, unused_mut)]
+                    fn visit_seq<A>(self, mut seq: A) -> Result<Self::Value, A::Error>
+                    where
+                        A: SeqAccess<'de>,
+                    {
+                        Ok([$(
+                            match seq.next_element::<DeserializeAsWrap<T, As>>()? {
+                                Some(value) => value.into_inner(),
+                                None => return Err(Error::invalid_length($idx, &self)),
+                            },
+                        )*])
+                    }
+                }
+
+                deserializer.deserialize_tuple(
+                    $len,
+                    ArrayVisitor::<DeserializeAsWrap<T, As>>(PhantomData),
+                )
+            }
+        }
+    };
+}
+
+array_impl!(0);
+array_impl!(1 0);
+array_impl!(2 0 1);
+array_impl!(3 0 1 2);
+array_impl!(4 0 1 2 3);
+array_impl!(5 0 1 2 3 4);
+array_impl!(6 0 1 2 3 4 5);
+array_impl!(7 0 1 2 3 4 5 6);
+array_impl!(8 0 1 2 3 4 5 6 7);
+array_impl!(9 0 1 2 3 4 5 6 7 8);
+array_impl!(10 0 1 2 3 4 5 6 7 8 9);
+array_impl!(11 0 1 2 3 4 5 6 7 8 9 10);
+array_impl!(12 0 1 2 3 4 5 6 7 8 9 10 11);
+array_impl!(13 0 1 2 3 4 5 6 7 8 9 10 11 12);
+array_impl!(14 0 1 2 3 4 5 6 7 8 9 10 11 12 13);
+array_impl!(15 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14);
+array_impl!(16 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15);
+array_impl!(17 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16);
+array_impl!(18 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17);
+array_impl!(19 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18);
+array_impl!(20 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19);
+array_impl!(21 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20);
+array_impl!(22 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21);
+array_impl!(23 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22);
+array_impl!(24 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23);
+array_impl!(25 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24);
+array_impl!(26 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25);
+array_impl!(27 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26);
+array_impl!(28 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27);
+array_impl!(29 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28);
+array_impl!(30 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29);
+array_impl!(31 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30);
+array_impl!(32 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31);
diff --git a/third_party/rust/serde_with/src/de/mod.rs b/third_party/rust/serde_with/src/de/mod.rs
new file mode 100644
index 0000000000..518b4f2606
--- /dev/null
+++ b/third_party/rust/serde_with/src/de/mod.rs
@@ -0,0 +1,143 @@
+//! Module for [`DeserializeAs`][] implementations
+//!
+//! The module contains the [`DeserializeAs`][] trait and helper code.
+//! Additionally, it contains implementations of [`DeserializeAs`][] for types defined in the Rust Standard Library or this crate.
+//!
+//! You can find more details on how to implement this trait for your types in the documentation of the [`DeserializeAs`][] trait and details about the usage in the [user guide][].
+//!
+//! [user guide]: crate::guide
+
+mod const_arrays;
+mod impls;
+
+use super::*;
+
+/// A **data structure** that can be deserialized from any data format supported by Serde, analogue to [`Deserialize`].
+///
+/// The trait is analogue to the [`serde::Deserialize`][`Deserialize`] trait, with the same meaning of input and output arguments.
+/// It can and should the implemented using the same code structure as the [`Deserialize`] trait.
+/// As such, the same advice for [implementing `Deserialize`][impl-deserialize] applies here.
+///
+/// # Differences to [`Deserialize`]
+///
+/// The trait is only required for container-like types or types implementing specific conversion functions.
+/// Container-like types are [`Vec`], [`BTreeMap`], but also [`Option`] and [`Box`].
+/// Conversion types deserialize into a different Rust type.
+/// For example, [`DisplayFromStr`] uses the [`FromStr`] trait after deserializing a string and [`DurationSeconds`] creates a [`Duration`] from either String or integer values.
+///
+/// This code shows how to implement [`Deserialize`] for [`Box`]:
+///
+/// ```rust,ignore
+/// impl<'de, T: Deserialize<'de>> Deserialize<'de> for Box<T> {
+///     fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+///     where
+///         D: Deserializer<'de>,
+///     {
+///         Ok(Box::new(Deserialize::deserialize(deserializer)?))
+///     }
+/// }
+/// ```
+///
+/// and this code shows how to do the same using [`DeserializeAs`][]:
+///
+/// ```rust,ignore
+/// impl<'de, T, U> DeserializeAs<'de, Box<T>> for Box<U>
+/// where
+///     U: DeserializeAs<'de, T>,
+/// {
+///     fn deserialize_as<D>(deserializer: D) -> Result<Box<T>, D::Error>
+///     where
+///         D: Deserializer<'de>,
+///     {
+///         Ok(Box::new(
+///             DeserializeAsWrap::<T, U>::deserialize(deserializer)?.into_inner(),
+///         ))
+///     }
+/// }
+/// ```
+///
+/// It uses two type parameters, `T` and `U` instead of only one and performs the deserialization step using the `DeserializeAsWrap` type.
+/// The `T` type is the on the Rust side after deserialization, whereas the `U` type determines how the value will be deserialized.
+/// These two changes are usually enough to make a container type implement [`DeserializeAs`][].
+///
+///
+/// [`DeserializeAsWrap`] is a piece of glue code which turns [`DeserializeAs`] into a serde compatible datatype, by converting all calls to `deserialize` into `deserialize_as`.
+/// This allows us to implement [`DeserializeAs`] such that it can be applied recursively throughout the whole data structure.
+/// This is mostly important for container types, such as `Vec` or `BTreeMap`.
+/// In a `BTreeMap` this allows us to specify two different serialization behaviors, one for key and one for value, using the [`DeserializeAs`] trait.
+///
+/// ## Implementing a converter Type
+///
+/// This shows a simplified implementation for [`DisplayFromStr`].
+///
+/// ```rust
+/// # #[cfg(all(feature = "macros"))] {
+/// # use serde::Deserialize;
+/// # use serde::de::Error;
+/// # use serde_with::DeserializeAs;
+/// # use std::str::FromStr;
+/// # use std::fmt::Display;
+/// struct DisplayFromStr;
+///
+/// impl<'de, T> DeserializeAs<'de, T> for DisplayFromStr
+/// where
+///     T: FromStr,
+///     T::Err: Display,
+/// {
+///     fn deserialize_as<D>(deserializer: D) -> Result<T, D::Error>
+///     where
+///         D: serde::Deserializer<'de>,
+///     {
+///         let s = String::deserialize(deserializer).map_err(Error::custom)?;
+///         s.parse().map_err(Error::custom)
+///     }
+/// }
+/// #
+/// # #[serde_with::serde_as]
+/// # #[derive(serde::Deserialize)]
+/// # struct S (#[serde_as(as = "DisplayFromStr")] bool);
+/// #
+/// # assert_eq!(false, serde_json::from_str::<S>(r#""false""#).unwrap().0);
+/// # }
+/// ```
+/// [`Box`]: std::boxed::Box
+/// [`BTreeMap`]: std::collections::BTreeMap
+/// [`Duration`]: std::time::Duration
+/// [`FromStr`]: std::str::FromStr
+/// [`Vec`]: std::vec::Vec
+/// [impl-deserialize]: https://serde.rs/impl-deserialize.html
+pub trait DeserializeAs<'de, T>: Sized {
+    /// Deserialize this value from the given Serde deserializer.
+    fn deserialize_as<D>(deserializer: D) -> Result<T, D::Error>
+    where
+        D: Deserializer<'de>;
+}
+
+/// Helper type to implement [`DeserializeAs`] for container-like types.
+#[derive(Debug)]
+pub struct DeserializeAsWrap<T, U> {
+    value: T,
+    marker: PhantomData<U>,
+}
+
+impl<T, U> DeserializeAsWrap<T, U> {
+    /// Return the inner value of type `T`.
+    pub fn into_inner(self) -> T {
+        self.value
+    }
+}
+
+impl<'de, T, U> Deserialize<'de> for DeserializeAsWrap<T, U>
+where
+    U: DeserializeAs<'de, T>,
+{
+    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        U::deserialize_as(deserializer).map(|value| Self {
+            value,
+            marker: PhantomData,
+        })
+    }
+}
diff --git a/third_party/rust/serde_with/src/duplicate_key_impls/error_on_duplicate.rs b/third_party/rust/serde_with/src/duplicate_key_impls/error_on_duplicate.rs
new file mode 100644
index 0000000000..9370f5fd51
--- /dev/null
+++ b/third_party/rust/serde_with/src/duplicate_key_impls/error_on_duplicate.rs
@@ -0,0 +1,127 @@
+use alloc::collections::{BTreeMap, BTreeSet};
+use core::hash::{BuildHasher, Hash};
+#[cfg(feature = "indexmap")]
+use indexmap_crate::{IndexMap, IndexSet};
+use std::collections::{HashMap, HashSet};
+
+pub trait PreventDuplicateInsertsSet<T> {
+    fn new(size_hint: Option<usize>) -> Self;
+
+    /// Return true if the insert was successful and the value did not exist in the set
+    fn insert(&mut self, value: T) -> bool;
+}
+
+pub trait PreventDuplicateInsertsMap<K, V> {
+    fn new(size_hint: Option<usize>) -> Self;
+
+    /// Return true if the insert was successful and the key did not exist in the map
+    fn insert(&mut self, key: K, value: V) -> bool;
+}
+
+impl<T, S> PreventDuplicateInsertsSet<T> for HashSet<T, S>
+where
+    T: Eq + Hash,
+    S: BuildHasher + Default,
+{
+    #[inline]
+    fn new(size_hint: Option<usize>) -> Self {
+        match size_hint {
+            Some(size) => Self::with_capacity_and_hasher(size, S::default()),
+            None => Self::with_hasher(S::default()),
+        }
+    }
+
+    #[inline]
+    fn insert(&mut self, value: T) -> bool {
+        self.insert(value)
+    }
+}
+
+#[cfg(feature = "indexmap")]
+impl<T, S> PreventDuplicateInsertsSet<T> for IndexSet<T, S>
+where
+    T: Eq + Hash,
+    S: BuildHasher + Default,
+{
+    #[inline]
+    fn new(size_hint: Option<usize>) -> Self {
+        match size_hint {
+            Some(size) => Self::with_capacity_and_hasher(size, S::default()),
+            None => Self::with_hasher(S::default()),
+        }
+    }
+
+    #[inline]
+    fn insert(&mut self, value: T) -> bool {
+        self.insert(value)
+    }
+}
+
+impl<T> PreventDuplicateInsertsSet<T> for BTreeSet<T>
+where
+    T: Ord,
+{
+    #[inline]
+    fn new(_size_hint: Option<usize>) -> Self {
+        Self::new()
+    }
+
+    #[inline]
+    fn insert(&mut self, value: T) -> bool {
+        self.insert(value)
+    }
+}
+
+impl<K, V, S> PreventDuplicateInsertsMap<K, V> for HashMap<K, V, S>
+where
+    K: Eq + Hash,
+    S: BuildHasher + Default,
+{
+    #[inline]
+    fn new(size_hint: Option<usize>) -> Self {
+        match size_hint {
+            Some(size) => Self::with_capacity_and_hasher(size, S::default()),
+            None => Self::with_hasher(S::default()),
+        }
+    }
+
+    #[inline]
+    fn insert(&mut self, key: K, value: V) -> bool {
+        self.insert(key, value).is_none()
+    }
+}
+
+#[cfg(feature = "indexmap")]
+impl<K, V, S> PreventDuplicateInsertsMap<K, V> for IndexMap<K, V, S>
+where
+    K: Eq + Hash,
+    S: BuildHasher + Default,
+{
+    #[inline]
+    fn new(size_hint: Option<usize>) -> Self {
+        match size_hint {
+            Some(size) => Self::with_capacity_and_hasher(size, S::default()),
+            None => Self::with_hasher(S::default()),
+        }
+    }
+
+    #[inline]
+    fn insert(&mut self, key: K, value: V) -> bool {
+        self.insert(key, value).is_none()
+    }
+}
+
+impl<K, V> PreventDuplicateInsertsMap<K, V> for BTreeMap<K, V>
+where
+    K: Ord,
+{
+    #[inline]
+    fn new(_size_hint: Option<usize>) -> Self {
+        Self::new()
+    }
+
+    #[inline]
+    fn insert(&mut self, key: K, value: V) -> bool {
+        self.insert(key, value).is_none()
+    }
+}
diff --git a/third_party/rust/serde_with/src/duplicate_key_impls/first_value_wins.rs b/third_party/rust/serde_with/src/duplicate_key_impls/first_value_wins.rs
new file mode 100644
index 0000000000..faf922b8c2
--- /dev/null
+++ b/third_party/rust/serde_with/src/duplicate_key_impls/first_value_wins.rs
@@ -0,0 +1,136 @@
+use alloc::collections::{BTreeMap, BTreeSet};
+use core::hash::{BuildHasher, Hash};
+#[cfg(feature = "indexmap")]
+use indexmap_crate::IndexMap;
+use std::collections::{HashMap, HashSet};
+
+#[deprecated = "This is serde's default behavior."]
+pub trait DuplicateInsertsFirstWinsSet<T> {
+    fn new(size_hint: Option<usize>) -> Self;
+
+    /// Insert the value into the set, if there is not already an existing value
+    fn insert(&mut self, value: T);
+}
+
+pub trait DuplicateInsertsFirstWinsMap<K, V> {
+    fn new(size_hint: Option<usize>) -> Self;
+
+    /// Insert the value into the map, if there is not already an existing value
+    fn insert(&mut self, key: K, value: V);
+}
+
+#[allow(deprecated)]
+impl<T, S> DuplicateInsertsFirstWinsSet<T> for HashSet<T, S>
+where
+    T: Eq + Hash,
+    S: BuildHasher + Default,
+{
+    #[inline]
+    fn new(size_hint: Option<usize>) -> Self {
+        match size_hint {
+            Some(size) => Self::with_capacity_and_hasher(size, S::default()),
+            None => Self::with_hasher(S::default()),
+        }
+    }
+
+    #[inline]
+    fn insert(&mut self, value: T) {
+        // Hashset already fulfils the contract and always keeps the first value
+        self.insert(value);
+    }
+}
+
+#[allow(deprecated)]
+impl<T> DuplicateInsertsFirstWinsSet<T> for BTreeSet<T>
+where
+    T: Ord,
+{
+    #[inline]
+    fn new(_size_hint: Option<usize>) -> Self {
+        Self::new()
+    }
+
+    #[inline]
+    fn insert(&mut self, value: T) {
+        // BTreeSet already fulfils the contract and always keeps the first value
+        self.insert(value);
+    }
+}
+
+impl<K, V, S> DuplicateInsertsFirstWinsMap<K, V> for HashMap<K, V, S>
+where
+    K: Eq + Hash,
+    S: BuildHasher + Default,
+{
+    #[inline]
+    fn new(size_hint: Option<usize>) -> Self {
+        match size_hint {
+            Some(size) => Self::with_capacity_and_hasher(size, S::default()),
+            None => Self::with_hasher(S::default()),
+        }
+    }
+
+    #[inline]
+    fn insert(&mut self, key: K, value: V) {
+        use std::collections::hash_map::Entry;
+
+        match self.entry(key) {
+            // we want to keep the first value, so do nothing
+            Entry::Occupied(_) => {}
+            Entry::Vacant(vacant) => {
+                vacant.insert(value);
+            }
+        }
+    }
+}
+
+#[cfg(feature = "indexmap")]
+impl<K, V, S> DuplicateInsertsFirstWinsMap<K, V> for IndexMap<K, V, S>
+where
+    K: Eq + Hash,
+    S: BuildHasher + Default,
+{
+    #[inline]
+    fn new(size_hint: Option<usize>) -> Self {
+        match size_hint {
+            Some(size) => Self::with_capacity_and_hasher(size, S::default()),
+            None => Self::with_hasher(S::default()),
+        }
+    }
+
+    #[inline]
+    fn insert(&mut self, key: K, value: V) {
+        use indexmap_crate::map::Entry;
+
+        match self.entry(key) {
+            // we want to keep the first value, so do nothing
+            Entry::Occupied(_) => {}
+            Entry::Vacant(vacant) => {
+                vacant.insert(value);
+            }
+        }
+    }
+}
+
+impl<K, V> DuplicateInsertsFirstWinsMap<K, V> for BTreeMap<K, V>
+where
+    K: Ord,
+{
+    #[inline]
+    fn new(_size_hint: Option<usize>) -> Self {
+        Self::new()
+    }
+
+    #[inline]
+    fn insert(&mut self, key: K, value: V) {
+        use alloc::collections::btree_map::Entry;
+
+        match self.entry(key) {
+            // we want to keep the first value, so do nothing
+            Entry::Occupied(_) => {}
+            Entry::Vacant(vacant) => {
+                vacant.insert(value);
+            }
+        }
+    }
+}
diff --git a/third_party/rust/serde_with/src/duplicate_key_impls/last_value_wins.rs b/third_party/rust/serde_with/src/duplicate_key_impls/last_value_wins.rs
new file mode 100644
index 0000000000..3eeeaac079
--- /dev/null
+++ b/third_party/rust/serde_with/src/duplicate_key_impls/last_value_wins.rs
@@ -0,0 +1,69 @@
+use alloc::collections::BTreeSet;
+use core::hash::{BuildHasher, Hash};
+#[cfg(feature = "indexmap")]
+use indexmap_crate::IndexSet;
+use std::collections::HashSet;
+
+pub trait DuplicateInsertsLastWinsSet<T> {
+    fn new(size_hint: Option<usize>) -> Self;
+
+    /// Insert or replace the existing value
+    fn replace(&mut self, value: T);
+}
+
+impl<T, S> DuplicateInsertsLastWinsSet<T> for HashSet<T, S>
+where
+    T: Eq + Hash,
+    S: BuildHasher + Default,
+{
+    #[inline]
+    fn new(size_hint: Option<usize>) -> Self {
+        match size_hint {
+            Some(size) => Self::with_capacity_and_hasher(size, S::default()),
+            None => Self::with_hasher(S::default()),
+        }
+    }
+
+    #[inline]
+    fn replace(&mut self, value: T) {
+        // Hashset already fulfils the contract
+        self.replace(value);
+    }
+}
+
+#[cfg(feature = "indexmap")]
+impl<T, S> DuplicateInsertsLastWinsSet<T> for IndexSet<T, S>
+where
+    T: Eq + Hash,
+    S: BuildHasher + Default,
+{
+    #[inline]
+    fn new(size_hint: Option<usize>) -> Self {
+        match size_hint {
+            Some(size) => Self::with_capacity_and_hasher(size, S::default()),
+            None => Self::with_hasher(S::default()),
+        }
+    }
+
+    #[inline]
+    fn replace(&mut self, value: T) {
+        // Hashset already fulfils the contract
+        self.replace(value);
+    }
+}
+
+impl<T> DuplicateInsertsLastWinsSet<T> for BTreeSet<T>
+where
+    T: Ord,
+{
+    #[inline]
+    fn new(_size_hint: Option<usize>) -> Self {
+        Self::new()
+    }
+
+    #[inline]
+    fn replace(&mut self, value: T) {
+        // BTreeSet already fulfils the contract
+        self.replace(value);
+    }
+}
diff --git a/third_party/rust/serde_with/src/duplicate_key_impls/mod.rs b/third_party/rust/serde_with/src/duplicate_key_impls/mod.rs
new file mode 100644
index 0000000000..6080812232
--- /dev/null
+++ b/third_party/rust/serde_with/src/duplicate_key_impls/mod.rs
@@ -0,0 +1,10 @@
+mod error_on_duplicate;
+mod first_value_wins;
+mod last_value_wins;
+
+#[allow(deprecated)]
+pub use self::{
+    error_on_duplicate::{PreventDuplicateInsertsMap, PreventDuplicateInsertsSet},
+    first_value_wins::{DuplicateInsertsFirstWinsMap, DuplicateInsertsFirstWinsSet},
+    last_value_wins::DuplicateInsertsLastWinsSet,
+};
diff --git a/third_party/rust/serde_with/src/enum_map.rs b/third_party/rust/serde_with/src/enum_map.rs
new file mode 100644
index 0000000000..ef65f8985f
--- /dev/null
+++ b/third_party/rust/serde_with/src/enum_map.rs
@@ -0,0 +1,888 @@
+use crate::{
+    content::ser::{Content, ContentSerializer},
+    DeserializeAs, SerializeAs,
+};
+use alloc::{string::ToString, vec::Vec};
+use core::{fmt, marker::PhantomData};
+use serde::{
+    de::{DeserializeSeed, EnumAccess, Error, MapAccess, SeqAccess, VariantAccess, Visitor},
+    ser,
+    ser::{Impossible, SerializeMap, SerializeSeq, SerializeStructVariant, SerializeTupleVariant},
+    Deserialize, Deserializer, Serialize, Serializer,
+};
+
+/// Represent a list of enum values as a map.
+///
+/// This **only works** if the enum uses the default *externally tagged* representation.
+/// Other enum representations are not supported.
+///
+/// serde data formats often represent *externally tagged* enums as maps with a single key.
+/// The key is the enum variant name, and the value is the variant value.
+/// Sometimes a map with multiple keys should be treated like a list of enum values.
+///
+/// # Examples
+///
+/// ## JSON Map with multiple keys
+///
+/// ```rust
+/// # #[cfg(feature = "macros")] {
+/// # use serde::{Deserialize, Serialize};
+/// use serde_with::EnumMap;
+///
+/// # #[derive(Debug, Clone, PartialEq, Eq)]
+/// #[derive(Serialize, Deserialize)]
+/// enum EnumValue {
+///     Int(i32),
+///     String(String),
+///     Unit,
+///     Tuple(i32, String, bool),
+///     Struct {
+///         a: i32,
+///         b: String,
+///         c: bool,
+///     },
+/// }
+///
+/// #[serde_with::serde_as]
+/// # #[derive(Debug, Clone, PartialEq, Eq)]
+/// #[derive(Serialize, Deserialize)]
+/// struct VecEnumValues (
+///     #[serde_as(as = "EnumMap")]
+///     Vec<EnumValue>,
+/// );
+///
+/// // ---
+///
+/// // This will serialize this list of values
+/// let values = VecEnumValues(vec![
+///     EnumValue::Int(123),
+///     EnumValue::String("FooBar".to_string()),
+///     EnumValue::Int(456),
+///     EnumValue::String("XXX".to_string()),
+///     EnumValue::Unit,
+///     EnumValue::Tuple(1, "Middle".to_string(), false),
+///     EnumValue::Struct {
+///         a: 666,
+///         b: "BBB".to_string(),
+///         c: true,
+///     },
+/// ]);
+///
+/// // into this JSON map
+/// // Duplicate keys are emitted for identical enum variants.
+/// let expected =
+/// r#"{
+///   "Int": 123,
+///   "String": "FooBar",
+///   "Int": 456,
+///   "String": "XXX",
+///   "Unit": null,
+///   "Tuple": [
+///     1,
+///     "Middle",
+///     false
+///   ],
+///   "Struct": {
+///     "a": 666,
+///     "b": "BBB",
+///     "c": true
+///   }
+/// }"#;
+///
+/// // Both serialization and deserialization work flawlessly.
+/// let serialized = serde_json::to_string_pretty(&values).unwrap();
+/// assert_eq!(expected, serialized);
+/// let deserialized: VecEnumValues = serde_json::from_str(&serialized).unwrap();
+/// assert_eq!(values, deserialized);
+/// # }
+/// ```
+///
+/// ## XML structure with varying keys
+///
+/// With `serde_xml_rs` tuple and struct variants are not supported since they fail to roundtrip.
+/// The enum may have such variants as long as they are not serialized or deserialized.
+///
+/// ```
+/// # #[cfg(feature = "macros")] {
+/// # use serde::{Deserialize, Serialize};
+/// use serde_with::EnumMap;
+///
+/// # #[derive(Debug, Clone, PartialEq, Eq)]
+/// #[derive(Serialize, Deserialize)]
+/// enum EnumValue {
+///     Int(i32),
+///     String(String),
+///     Unit,
+/// }
+///
+/// #[serde_with::serde_as]
+/// # #[derive(Debug, Clone, PartialEq, Eq)]
+/// #[derive(Serialize, Deserialize)]
+/// struct VecEnumValues {
+///     #[serde_as(as = "EnumMap")]
+///     vec: Vec<EnumValue>,
+/// }
+///
+/// // ---
+///
+/// // This will serialize this list of values
+/// let values = VecEnumValues {
+///     vec: vec![
+///         EnumValue::Int(123),
+///         EnumValue::String("FooBar".to_string()),
+///         EnumValue::Int(456),
+///         EnumValue::String("XXX".to_string()),
+///         EnumValue::Unit,
+///     ],
+/// };
+///
+/// // into this XML document
+/// // Duplicate keys are emitted for identical enum variants.
+/// let expected = r#"
+/// <VecEnumValues>
+///     <vec>
+///         <Int>123</Int>
+///         <String>FooBar</String>
+///         <Int>456</Int>
+///         <String>XXX</String>
+///         <Unit></Unit>
+///     </vec>
+/// </VecEnumValues>"#
+/// // Remove whitespace
+/// .replace(' ', "")
+/// .replace('\n', "");
+///
+/// // Both serialization and deserialization work flawlessly.
+/// let serialized = serde_xml_rs::to_string(&values).unwrap();
+/// assert_eq!(expected, serialized);
+/// let deserialized: VecEnumValues = serde_xml_rs::from_str(&serialized).unwrap();
+/// assert_eq!(values, deserialized);
+/// # }
+/// ```
+#[derive(Debug, Copy, Clone)]
+pub struct EnumMap;
+
+impl<T> SerializeAs<Vec<T>> for EnumMap
+where
+    T: Serialize,
+{
+    fn serialize_as<S>(source: &Vec<T>, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        source.serialize(SeqAsMapSerializer(serializer))
+    }
+}
+
+impl<'de, T> DeserializeAs<'de, Vec<T>> for EnumMap
+where
+    T: Deserialize<'de>,
+{
+    fn deserialize_as<D>(deserializer: D) -> Result<Vec<T>, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        struct EnumMapVisitor<T>(PhantomData<T>);
+
+        impl<'de, T> Visitor<'de> for EnumMapVisitor<T>
+        where
+            T: Deserialize<'de>,
+        {
+            type Value = Vec<T>;
+
+            fn expecting(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
+                write!(formatter, "a map or enum values")
+            }
+
+            fn visit_map<A: MapAccess<'de>>(self, map: A) -> Result<Self::Value, A::Error> {
+                Vec::deserialize(SeqDeserializer(map))
+            }
+        }
+
+        deserializer.deserialize_map(EnumMapVisitor(PhantomData))
+    }
+}
+
+static END_OF_MAP_IDENTIFIER: &str = "__PRIVATE_END_OF_MAP_MARKER__";
+
+// Serialization code below here
+
+/// Convert a sequence to a map during serialization.
+///
+/// Only `serialize_seq` is implemented and forwarded to `serialize_map` on the inner `Serializer`.
+/// The elements are serialized with [`SerializeSeqElement`].
+struct SeqAsMapSerializer<S>(S);
+
+impl<S> Serializer for SeqAsMapSerializer<S>
+where
+    S: Serializer,
+{
+    type Ok = S::Ok;
+    type Error = S::Error;
+
+    type SerializeSeq = SerializeSeqElement<S::SerializeMap>;
+    type SerializeTuple = Impossible<S::Ok, S::Error>;
+    type SerializeTupleStruct = Impossible<S::Ok, S::Error>;
+    type SerializeTupleVariant = Impossible<S::Ok, S::Error>;
+    type SerializeMap = Impossible<S::Ok, S::Error>;
+    type SerializeStruct = Impossible<S::Ok, S::Error>;
+    type SerializeStructVariant = Impossible<S::Ok, S::Error>;
+
+    fn serialize_bool(self, _v: bool) -> Result<Self::Ok, Self::Error> {
+        Err(ser::Error::custom("wrong type for EnumMap"))
+    }
+
+    fn serialize_i8(self, _v: i8) -> Result<Self::Ok, Self::Error> {
+        Err(ser::Error::custom("wrong type for EnumMap"))
+    }
+
+    fn serialize_i16(self, _v: i16) -> Result<Self::Ok, Self::Error> {
+        Err(ser::Error::custom("wrong type for EnumMap"))
+    }
+
+    fn serialize_i32(self, _v: i32) -> Result<Self::Ok, Self::Error> {
+        Err(ser::Error::custom("wrong type for EnumMap"))
+    }
+
+    fn serialize_i64(self, _v: i64) -> Result<Self::Ok, Self::Error> {
+        Err(ser::Error::custom("wrong type for EnumMap"))
+    }
+
+    fn serialize_i128(self, _v: i128) -> Result<Self::Ok, Self::Error> {
+        Err(ser::Error::custom("wrong type for EnumMap"))
+    }
+
+    fn serialize_u8(self, _v: u8) -> Result<Self::Ok, Self::Error> {
+        Err(ser::Error::custom("wrong type for EnumMap"))
+    }
+
+    fn serialize_u16(self, _v: u16) -> Result<Self::Ok, Self::Error> {
+        Err(ser::Error::custom("wrong type for EnumMap"))
+    }
+
+    fn serialize_u32(self, _v: u32) -> Result<Self::Ok, Self::Error> {
+        Err(ser::Error::custom("wrong type for EnumMap"))
+    }
+
+    fn serialize_u64(self, _v: u64) -> Result<Self::Ok, Self::Error> {
+        Err(ser::Error::custom("wrong type for EnumMap"))
+    }
+
+    fn serialize_u128(self, _v: u128) -> Result<Self::Ok, Self::Error> {
+        Err(ser::Error::custom("wrong type for EnumMap"))
+    }
+
+    fn serialize_f32(self, _v: f32) -> Result<Self::Ok, Self::Error> {
+        Err(ser::Error::custom("wrong type for EnumMap"))
+    }
+
+    fn serialize_f64(self, _v: f64) -> Result<Self::Ok, Self::Error> {
+        Err(ser::Error::custom("wrong type for EnumMap"))
+    }
+
+    fn serialize_char(self, _v: char) -> Result<Self::Ok, Self::Error> {
+        Err(ser::Error::custom("wrong type for EnumMap"))
+    }
+
+    fn serialize_str(self, _v: &str) -> Result<Self::Ok, Self::Error> {
+        Err(ser::Error::custom("wrong type for EnumMap"))
+    }
+
+    fn serialize_bytes(self, _v: &[u8]) -> Result<Self::Ok, Self::Error> {
+        Err(ser::Error::custom("wrong type for EnumMap"))
+    }
+
+    fn serialize_none(self) -> Result<Self::Ok, Self::Error> {
+        Err(ser::Error::custom("wrong type for EnumMap"))
+    }
+
+    fn serialize_some<T: ?Sized>(self, _value: &T) -> Result<Self::Ok, Self::Error>
+    where
+        T: Serialize,
+    {
+        Err(ser::Error::custom("wrong type for EnumMap"))
+    }
+
+    fn serialize_unit(self) -> Result<Self::Ok, Self::Error> {
+        Err(ser::Error::custom("wrong type for EnumMap"))
+    }
+
+    fn serialize_unit_struct(self, _name: &'static str) -> Result<Self::Ok, Self::Error> {
+        Err(ser::Error::custom("wrong type for EnumMap"))
+    }
+
+    fn serialize_unit_variant(
+        self,
+        _name: &'static str,
+        _variant_index: u32,
+        _variant: &'static str,
+    ) -> Result<Self::Ok, Self::Error> {
+        Err(ser::Error::custom("wrong type for EnumMap"))
+    }
+
+    fn serialize_newtype_struct<T: ?Sized>(
+        self,
+        _name: &'static str,
+        _value: &T,
+    ) -> Result<Self::Ok, Self::Error>
+    where
+        T: Serialize,
+    {
+        Err(ser::Error::custom("wrong type for EnumMap"))
+    }
+
+    fn serialize_newtype_variant<T: ?Sized>(
+        self,
+        _name: &'static str,
+        _variant_index: u32,
+        _variant: &'static str,
+        _value: &T,
+    ) -> Result<Self::Ok, Self::Error>
+    where
+        T: Serialize,
+    {
+        Err(ser::Error::custom("wrong type for EnumMap"))
+    }
+
+    fn serialize_seq(self, len: Option<usize>) -> Result<Self::SerializeSeq, Self::Error> {
+        let is_human_readable = self.0.is_human_readable();
+        self.0
+            .serialize_map(len)
+            .map(|delegate| SerializeSeqElement {
+                delegate,
+                is_human_readable,
+            })
+    }
+
+    fn serialize_tuple(self, _len: usize) -> Result<Self::SerializeTuple, Self::Error> {
+        Err(ser::Error::custom("wrong type for EnumMap"))
+    }
+
+    fn serialize_tuple_struct(
+        self,
+        _name: &'static str,
+        _len: usize,
+    ) -> Result<Self::SerializeTupleStruct, Self::Error> {
+        Err(ser::Error::custom("wrong type for EnumMap"))
+    }
+
+    fn serialize_tuple_variant(
+        self,
+        _name: &'static str,
+        _variant_index: u32,
+        _variant: &'static str,
+        _len: usize,
+    ) -> Result<Self::SerializeTupleVariant, Self::Error> {
+        Err(ser::Error::custom("wrong type for EnumMap"))
+    }
+
+    fn serialize_map(self, _len: Option<usize>) -> Result<Self::SerializeMap, Self::Error> {
+        Err(ser::Error::custom("wrong type for EnumMap"))
+    }
+
+    fn serialize_struct(
+        self,
+        _name: &'static str,
+        _len: usize,
+    ) -> Result<Self::SerializeStruct, Self::Error> {
+        Err(ser::Error::custom("wrong type for EnumMap"))
+    }
+
+    fn serialize_struct_variant(
+        self,
+        _name: &'static str,
+        _variant_index: u32,
+        _variant: &'static str,
+        _len: usize,
+    ) -> Result<Self::SerializeStructVariant, Self::Error> {
+        Err(ser::Error::custom("wrong type for EnumMap"))
+    }
+}
+
+/// Serialize a single element but turn the sequence into a map logic.
+///
+/// It uses [`SerializeEnumAsMapElement`] for the map element serialization.
+///
+/// The [`Serializer`] implementation handles all the `serialize_*_variant` functions and defers to [`SerializeVariant`] for the more complicated tuple and struct variants.
+struct SerializeSeqElement<M> {
+    delegate: M,
+    is_human_readable: bool,
+}
+
+impl<M> SerializeSeq for SerializeSeqElement<M>
+where
+    M: SerializeMap,
+{
+    type Ok = M::Ok;
+    type Error = M::Error;
+
+    fn serialize_element<T: ?Sized>(&mut self, value: &T) -> Result<(), Self::Error>
+    where
+        T: Serialize,
+    {
+        value.serialize(EnumAsMapElementSerializer {
+            delegate: &mut self.delegate,
+            is_human_readable: self.is_human_readable,
+        })?;
+        Ok(())
+    }
+
+    fn end(self) -> Result<Self::Ok, Self::Error> {
+        self.delegate.end()
+    }
+}
+
+struct EnumAsMapElementSerializer<'a, M> {
+    delegate: &'a mut M,
+    is_human_readable: bool,
+}
+
+impl<'a, M> Serializer for EnumAsMapElementSerializer<'a, M>
+where
+    M: SerializeMap,
+{
+    type Ok = ();
+    type Error = M::Error;
+
+    type SerializeSeq = Impossible<Self::Ok, Self::Error>;
+    type SerializeTuple = Impossible<Self::Ok, Self::Error>;
+    type SerializeTupleStruct = Impossible<Self::Ok, Self::Error>;
+    type SerializeTupleVariant = SerializeVariant<'a, M>;
+    type SerializeMap = Impossible<Self::Ok, Self::Error>;
+    type SerializeStruct = Impossible<Self::Ok, Self::Error>;
+    type SerializeStructVariant = SerializeVariant<'a, M>;
+
+    fn serialize_bool(self, _v: bool) -> Result<Self::Ok, Self::Error> {
+        Err(ser::Error::custom("wrong type for EnumMap"))
+    }
+
+    fn serialize_i8(self, _v: i8) -> Result<Self::Ok, Self::Error> {
+        Err(ser::Error::custom("wrong type for EnumMap"))
+    }
+
+    fn serialize_i16(self, _v: i16) -> Result<Self::Ok, Self::Error> {
+        Err(ser::Error::custom("wrong type for EnumMap"))
+    }
+
+    fn serialize_i32(self, _v: i32) -> Result<Self::Ok, Self::Error> {
+        Err(ser::Error::custom("wrong type for EnumMap"))
+    }
+
+    fn serialize_i64(self, _v: i64) -> Result<Self::Ok, Self::Error> {
+        Err(ser::Error::custom("wrong type for EnumMap"))
+    }
+
+    fn serialize_i128(self, _v: i128) -> Result<Self::Ok, Self::Error> {
+        Err(ser::Error::custom("wrong type for EnumMap"))
+    }
+
+    fn serialize_u8(self, _v: u8) -> Result<Self::Ok, Self::Error> {
+        Err(ser::Error::custom("wrong type for EnumMap"))
+    }
+
+    fn serialize_u16(self, _v: u16) -> Result<Self::Ok, Self::Error> {
+        Err(ser::Error::custom("wrong type for EnumMap"))
+    }
+
+    fn serialize_u32(self, _v: u32) -> Result<Self::Ok, Self::Error> {
+        Err(ser::Error::custom("wrong type for EnumMap"))
+    }
+
+    fn serialize_u64(self, _v: u64) -> Result<Self::Ok, Self::Error> {
+        Err(ser::Error::custom("wrong type for EnumMap"))
+    }
+
+    fn serialize_u128(self, _v: u128) -> Result<Self::Ok, Self::Error> {
+        Err(ser::Error::custom("wrong type for EnumMap"))
+    }
+
+    fn serialize_f32(self, _v: f32) -> Result<Self::Ok, Self::Error> {
+        Err(ser::Error::custom("wrong type for EnumMap"))
+    }
+
+    fn serialize_f64(self, _v: f64) -> Result<Self::Ok, Self::Error> {
+        Err(ser::Error::custom("wrong type for EnumMap"))
+    }
+
+    fn serialize_char(self, _v: char) -> Result<Self::Ok, Self::Error> {
+        Err(ser::Error::custom("wrong type for EnumMap"))
+    }
+
+    fn serialize_str(self, _v: &str) -> Result<Self::Ok, Self::Error> {
+        Err(ser::Error::custom("wrong type for EnumMap"))
+    }
+
+    fn serialize_bytes(self, _v: &[u8]) -> Result<Self::Ok, Self::Error> {
+        Err(ser::Error::custom("wrong type for EnumMap"))
+    }
+
+    fn serialize_none(self) -> Result<Self::Ok, Self::Error> {
+        Err(ser::Error::custom("wrong type for EnumMap"))
+    }
+
+    fn serialize_some<T: ?Sized>(self, _value: &T) -> Result<Self::Ok, Self::Error>
+    where
+        T: Serialize,
+    {
+        Err(ser::Error::custom("wrong type for EnumMap"))
+    }
+
+    fn serialize_unit(self) -> Result<Self::Ok, Self::Error> {
+        Err(ser::Error::custom("wrong type for EnumMap"))
+    }
+
+    fn serialize_unit_struct(self, _name: &'static str) -> Result<Self::Ok, Self::Error> {
+        Err(ser::Error::custom("wrong type for EnumMap"))
+    }
+
+    fn serialize_unit_variant(
+        self,
+        _name: &'static str,
+        _variant_index: u32,
+        variant: &'static str,
+    ) -> Result<Self::Ok, Self::Error> {
+        self.delegate.serialize_entry(variant, &())?;
+        Ok(())
+    }
+
+    fn serialize_newtype_struct<T: ?Sized>(
+        self,
+        _name: &'static str,
+        _value: &T,
+    ) -> Result<Self::Ok, Self::Error>
+    where
+        T: Serialize,
+    {
+        Err(ser::Error::custom("wrong type for EnumMap"))
+    }
+
+    fn serialize_newtype_variant<T: ?Sized>(
+        self,
+        _name: &'static str,
+        _variant_index: u32,
+        variant: &'static str,
+        value: &T,
+    ) -> Result<Self::Ok, Self::Error>
+    where
+        T: Serialize,
+    {
+        self.delegate.serialize_entry(variant, value)?;
+        Ok(())
+    }
+
+    fn serialize_seq(self, _len: Option<usize>) -> Result<Self::SerializeSeq, Self::Error> {
+        Err(ser::Error::custom("wrong type for EnumMap"))
+    }
+
+    fn serialize_tuple(self, _len: usize) -> Result<Self::SerializeTuple, Self::Error> {
+        Err(ser::Error::custom("wrong type for EnumMap"))
+    }
+
+    fn serialize_tuple_struct(
+        self,
+        _name: &'static str,
+        _len: usize,
+    ) -> Result<Self::SerializeTupleStruct, Self::Error> {
+        Err(ser::Error::custom("wrong type for EnumMap"))
+    }
+
+    fn serialize_tuple_variant(
+        self,
+        name: &'static str,
+        _variant_index: u32,
+        variant: &'static str,
+        len: usize,
+    ) -> Result<Self::SerializeTupleVariant, Self::Error> {
+        Ok(SerializeVariant {
+            delegate: self.delegate,
+            is_human_readable: self.is_human_readable,
+            variant,
+            content: Content::TupleStruct(name, Vec::with_capacity(len)),
+        })
+    }
+
+    fn serialize_map(self, _len: Option<usize>) -> Result<Self::SerializeMap, Self::Error> {
+        Err(ser::Error::custom("wrong type for EnumMap"))
+    }
+
+    fn serialize_struct(
+        self,
+        _name: &'static str,
+        _len: usize,
+    ) -> Result<Self::SerializeStruct, Self::Error> {
+        Err(ser::Error::custom("wrong type for EnumMap"))
+    }
+
+    fn serialize_struct_variant(
+        self,
+        name: &'static str,
+        _variant_index: u32,
+        variant: &'static str,
+        len: usize,
+    ) -> Result<Self::SerializeStructVariant, Self::Error> {
+        Ok(SerializeVariant {
+            delegate: self.delegate,
+            is_human_readable: self.is_human_readable,
+            variant,
+            content: Content::Struct(name, Vec::with_capacity(len)),
+        })
+    }
+}
+
+/// Serialize a struct or tuple variant enum as a map element
+///
+/// [`SerializeStructVariant`] serializes a struct variant, and [`SerializeTupleVariant`] a tuple variant.
+struct SerializeVariant<'a, M> {
+    delegate: &'a mut M,
+    is_human_readable: bool,
+    variant: &'static str,
+    content: Content,
+}
+
+impl<'a, M> SerializeStructVariant for SerializeVariant<'a, M>
+where
+    M: SerializeMap,
+{
+    type Ok = ();
+
+    type Error = M::Error;
+
+    fn serialize_field<T: ?Sized>(
+        &mut self,
+        key: &'static str,
+        value: &T,
+    ) -> Result<(), Self::Error>
+    where
+        T: Serialize,
+    {
+        // Serialize to a Content type first
+        let value: Content = value.serialize(ContentSerializer::new(self.is_human_readable))?;
+        if let Content::Struct(_name, fields) = &mut self.content {
+            fields.push((key, value));
+        }
+        Ok(())
+    }
+
+    fn end(self) -> Result<Self::Ok, Self::Error> {
+        self.delegate.serialize_entry(&self.variant, &self.content)
+    }
+}
+
+impl<'a, M> SerializeTupleVariant for SerializeVariant<'a, M>
+where
+    M: SerializeMap,
+{
+    type Ok = ();
+
+    type Error = M::Error;
+
+    fn serialize_field<T: ?Sized>(&mut self, value: &T) -> Result<(), Self::Error>
+    where
+        T: Serialize,
+    {
+        // Serialize to a Content type first
+        let value: Content = value.serialize(ContentSerializer::new(self.is_human_readable))?;
+        if let Content::TupleStruct(_name, fields) = &mut self.content {
+            fields.push(value);
+        }
+        Ok(())
+    }
+
+    fn end(self) -> Result<Self::Ok, Self::Error> {
+        self.delegate.serialize_entry(&self.variant, &self.content)
+    }
+}
+
+// Below is deserialization code
+
+/// Deserialize the sequence of enum instances.
+///
+/// The main [`Deserializer`] implementation handles the outer sequence (e.g., `Vec`), while the [`SeqAccess`] implementation is responsible for the inner elements.
+struct SeqDeserializer<M>(M);
+
+impl<'de, M> Deserializer<'de> for SeqDeserializer<M>
+where
+    M: MapAccess<'de>,
+{
+    type Error = M::Error;
+
+    fn deserialize_seq<V>(self, visitor: V) -> Result<V::Value, Self::Error>
+    where
+        V: Visitor<'de>,
+    {
+        visitor.visit_seq(self)
+    }
+
+    fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Self::Error>
+    where
+        V: Visitor<'de>,
+    {
+        self.deserialize_seq(visitor)
+    }
+
+    serde::forward_to_deserialize_any! {
+        bool i8 i16 i32 i64 i128 u8 u16 u32 u64 u128 f32 f64 char str string
+        bytes byte_buf option unit unit_struct newtype_struct tuple
+        tuple_struct map struct enum identifier ignored_any
+    }
+}
+
+impl<'de, M> SeqAccess<'de> for SeqDeserializer<M>
+where
+    M: MapAccess<'de>,
+{
+    type Error = M::Error;
+
+    fn next_element_seed<T>(&mut self, seed: T) -> Result<Option<T::Value>, Self::Error>
+    where
+        T: DeserializeSeed<'de>,
+    {
+        match seed.deserialize(EnumDeserializer(&mut self.0)) {
+            Ok(value) => Ok(Some(value)),
+            Err(err) => {
+                // Unfortunately we loose the optional aspect of MapAccess, so we need to special case an error value to mark the end of the map.
+                if err.to_string().contains(END_OF_MAP_IDENTIFIER) {
+                    Ok(None)
+                } else {
+                    Err(err)
+                }
+            }
+        }
+    }
+
+    fn size_hint(&self) -> Option<usize> {
+        self.0.size_hint()
+    }
+}
+
+/// Deserialize an enum from a map element
+///
+/// The [`Deserializer`] implementation is the starting point, which first calls the [`EnumAccess`] methods.
+/// The [`EnumAccess`] is used to deserialize the enum variant type of the enum.
+/// The [`VariantAccess`] is used to deserialize the value part of the enum.
+struct EnumDeserializer<M>(M);
+
+impl<'de, M> Deserializer<'de> for EnumDeserializer<M>
+where
+    M: MapAccess<'de>,
+{
+    type Error = M::Error;
+
+    fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Self::Error>
+    where
+        V: Visitor<'de>,
+    {
+        self.deserialize_enum("", &[], visitor)
+    }
+
+    fn deserialize_enum<V>(
+        self,
+        _name: &'static str,
+        _variants: &'static [&'static str],
+        visitor: V,
+    ) -> Result<V::Value, Self::Error>
+    where
+        V: Visitor<'de>,
+    {
+        visitor.visit_enum(self)
+    }
+
+    serde::forward_to_deserialize_any! {
+        bool i8 i16 i32 i64 i128 u8 u16 u32 u64 u128 f32 f64 char str string
+        bytes byte_buf option unit unit_struct newtype_struct seq tuple
+        tuple_struct map struct identifier ignored_any
+    }
+}
+
+impl<'de, M> EnumAccess<'de> for EnumDeserializer<M>
+where
+    M: MapAccess<'de>,
+{
+    type Error = M::Error;
+    type Variant = Self;
+
+    fn variant_seed<T>(mut self, seed: T) -> Result<(T::Value, Self::Variant), Self::Error>
+    where
+        T: DeserializeSeed<'de>,
+    {
+        match self.0.next_key_seed(seed)? {
+            Some(key) => Ok((key, self)),
+
+            // Unfortunately we loose the optional aspect of MapAccess, so we need to special case an error value to mark the end of the map.
+            None => Err(Error::custom(END_OF_MAP_IDENTIFIER)),
+        }
+    }
+}
+
+impl<'de, M> VariantAccess<'de> for EnumDeserializer<M>
+where
+    M: MapAccess<'de>,
+{
+    type Error = M::Error;
+
+    fn unit_variant(mut self) -> Result<(), Self::Error> {
+        self.0.next_value()
+    }
+
+    fn newtype_variant_seed<T>(mut self, seed: T) -> Result<T::Value, Self::Error>
+    where
+        T: DeserializeSeed<'de>,
+    {
+        self.0.next_value_seed(seed)
+    }
+
+    fn tuple_variant<V>(mut self, len: usize, visitor: V) -> Result<V::Value, Self::Error>
+    where
+        V: Visitor<'de>,
+    {
+        self.0.next_value_seed(SeedTupleVariant { len, visitor })
+    }
+
+    fn struct_variant<V>(
+        mut self,
+        _fields: &'static [&'static str],
+        visitor: V,
+    ) -> Result<V::Value, Self::Error>
+    where
+        V: Visitor<'de>,
+    {
+        self.0.next_value_seed(SeedStructVariant { visitor })
+    }
+}
+
+struct SeedTupleVariant<V> {
+    len: usize,
+    visitor: V,
+}
+
+impl<'de, V> DeserializeSeed<'de> for SeedTupleVariant<V>
+where
+    V: Visitor<'de>,
+{
+    type Value = V::Value;
+
+    fn deserialize<D>(self, deserializer: D) -> Result<Self::Value, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        deserializer.deserialize_tuple(self.len, self.visitor)
+    }
+}
+
+struct SeedStructVariant<V> {
+    visitor: V,
+}
+
+impl<'de, V> DeserializeSeed<'de> for SeedStructVariant<V>
+where
+    V: Visitor<'de>,
+{
+    type Value = V::Value;
+
+    fn deserialize<D>(self, deserializer: D) -> Result<Self::Value, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        deserializer.deserialize_map(self.visitor)
+    }
+}
diff --git a/third_party/rust/serde_with/src/flatten_maybe.rs b/third_party/rust/serde_with/src/flatten_maybe.rs
new file mode 100644
index 0000000000..e012812d5a
--- /dev/null
+++ b/third_party/rust/serde_with/src/flatten_maybe.rs
@@ -0,0 +1,86 @@
+/// Support deserializing from flattened and non-flattened representation
+///
+/// When working with different serialization formats, sometimes it is more idiomatic to flatten
+/// fields, while other formats prefer nesting. Using `#[serde(flatten)]` only the flattened form
+/// is supported.
+///
+/// This helper creates a function, which support deserializing from either the flattened or the
+/// nested form. It gives an error, when both forms are provided. The `flatten` attribute is
+/// required on the field such that the helper works. The serialization format will always be
+/// flattened.
+///
+/// # Examples
+///
+/// ```rust
+/// # use serde::Deserialize;
+/// #
+/// // Setup the types
+/// #[derive(Deserialize, Debug)]
+/// struct S {
+///     #[serde(flatten, deserialize_with = "deserialize_t")]
+///     t: T,
+/// }
+///
+/// #[derive(Deserialize, Debug)]
+/// struct T {
+///     i: i32,
+/// }
+///
+/// // The macro creates custom deserialization code.
+/// // You need to specify a function name and the field name of the flattened field.
+/// serde_with::flattened_maybe!(deserialize_t, "t");
+///
+/// # fn main() {
+/// // Supports both flattened
+/// let j = r#" {"i":1} "#;
+/// assert!(serde_json::from_str::<S>(j).is_ok());
+///
+/// // and non-flattened versions.
+/// let j = r#" {"t":{"i":1}} "#;
+/// assert!(serde_json::from_str::<S>(j).is_ok());
+///
+/// // Ensure that the value is given
+/// let j = r#" {} "#;
+/// assert!(serde_json::from_str::<S>(j).is_err());
+///
+/// // and only occurs once, not multiple times.
+/// let j = r#" {"i":1,"t":{"i":1}} "#;
+/// assert!(serde_json::from_str::<S>(j).is_err());
+/// # }
+/// ```
+#[macro_export]
+macro_rules! flattened_maybe {
+    ($fn:ident, $field:literal) => {
+        fn $fn<'de, T, D>(deserializer: D) -> ::std::result::Result<T, D::Error>
+        where
+            T: $crate::serde::Deserialize<'de>,
+            D: $crate::serde::Deserializer<'de>,
+        {
+            use ::std::{
+                option::Option::{self, None, Some},
+                result::Result::{self, Err, Ok},
+            };
+            use $crate::serde;
+
+            #[derive($crate::serde::Deserialize)]
+            #[serde(crate = "serde")]
+            pub struct Both<T> {
+                #[serde(flatten)]
+                flat: Option<T>,
+                #[serde(rename = $field)]
+                not_flat: Option<T>,
+            }
+
+            let both: Both<T> = $crate::serde::Deserialize::deserialize(deserializer)?;
+            match (both.flat, both.not_flat) {
+                (Some(t), None) | (None, Some(t)) => Ok(t),
+                (None, None) => Err($crate::serde::de::Error::missing_field($field)),
+                (Some(_), Some(_)) => Err($crate::serde::de::Error::custom(concat!(
+                    "`",
+                    $field,
+                    "` is both flattened and not"
+                ))),
+            }
+        }
+    };
+}
diff --git a/third_party/rust/serde_with/src/formats.rs b/third_party/rust/serde_with/src/formats.rs
new file mode 100644
index 0000000000..2d7aaa6965
--- /dev/null
+++ b/third_party/rust/serde_with/src/formats.rs
@@ -0,0 +1,96 @@
+//! Specify the format and how lenient the deserialization is
+
+use alloc::string::String;
+
+/// Specify how to serialize/deserialize a type
+///
+/// The format specifier allows to configure how a value is serialized/deserialized.
+/// For example, you can serialize a timestamp as an integer using the UNIX epoch, as a string containing an integer, or as a string using ISO 8601.
+/// This [`Format`] traits allows more flexibility in configuring the format without the need to create a new type for each case.
+pub trait Format {}
+
+macro_rules! impl_format {
+    ($(#[$attr:meta] $t:ty)*) => {
+        $(
+            #[$attr]
+            impl Format for $t {}
+        )*
+    };
+}
+macro_rules! create_format {
+    ($(#[$attr:meta] $t:ident)*) => {
+        $(
+            #[$attr]
+            #[derive(Copy, Clone, Debug, Default)]
+            pub struct $t;
+            impl_format!(#[$attr] $t);
+        )*
+    };
+}
+impl_format!(
+    /// Serialize into an i8
+    i8
+    /// Serialize into a u8
+    u8
+    /// Serialize into an i16
+    i16
+    /// Serialize into a u16
+    u16
+    /// Serialize into an i32
+    i32
+    /// Serialize into a u32
+    u32
+    /// Serialize into an i64
+    i64
+    /// Serialize into a u64
+    u64
+
+    /// Serialize into a f32
+    f32
+    /// Serialize into a f64
+    f64
+
+    /// Serialize into a bool
+    bool
+
+    /// Serialize into a String
+    String
+);
+serde::serde_if_integer128!(impl_format!(
+    /// Serialize into an i128
+    i128
+    /// Serialize into a u128
+    u128
+););
+
+create_format!(
+    /// Use uppercase characters
+    Uppercase
+    /// Use lowercase characters
+    Lowercase
+
+    /// Use in combination with [`OneOrMany`](crate::OneOrMany). Emit single element for lists of size 1.
+    PreferOne
+    /// Use in combination with [`OneOrMany`](crate::OneOrMany). Always emit the list form.
+    PreferMany
+
+    /// Emit padding during serialization.
+    Padded
+    /// Do not emit padding during serialization.
+    Unpadded
+);
+
+/// Specify how lenient the deserialization process should be
+///
+/// Formats which make use of this trait should specify how it affects the deserialization behavior.
+pub trait Strictness {}
+
+/// Use strict deserialization behavior, see [`Strictness`].
+#[derive(Copy, Clone, Debug, Default)]
+pub struct Strict;
+impl Strictness for Strict {}
+
+/// Use a flexible deserialization behavior, see [`Strictness`].
+#[derive(Copy, Clone, Debug, Default)]
+pub struct Flexible;
+impl Strictness for Flexible {}
diff --git a/third_party/rust/serde_with/src/guide.md b/third_party/rust/serde_with/src/guide.md
new file mode 100644
index 0000000000..9eb80dd915
--- /dev/null
+++ b/third_party/rust/serde_with/src/guide.md
@@ -0,0 +1,144 @@
+# `serde_with` User Guide
+
+This crate provides helper functions to extend and change how [`serde`] serializes different data types.
+For example, you can serialize [a map as a sequence of tuples][crate::guide::serde_as#maps-to-vec-of-tuples], serialize [using the `Display` and `FromStr` traits][`DisplayFromStr`], or serialize [an empty `String` like `None`][NoneAsEmptyString].
+`serde_with` covers types from the Rust Standard Library and some common crates like [`chrono`][serde_with_chrono].
+
+[**A list of all supported transformations is available on this page.**](crate::guide::serde_as_transformations)
+
+The crate offers four types of functionality.
+
+## 1. A more flexible and composable replacement for the with annotation, called `serde_as` *(v1.5.0+)*
+
+This is an alternative to [serde's with-annotation][with-annotation], which adds flexibility and composability to the scheme.
+The main downside is that it work with fewer types than [with-annotations][with-annotation].
+However, all types from the Rust Standard Library should be supported in all combinations and any missing entry is a bug.
+
+The `serde_as` scheme is based on two new traits: [`SerializeAs`] and [`DeserializeAs`].  
+[Check out the detailed page about `serde_as` and the available features.](crate::guide::serde_as)
+
+### Example
+
+```rust
+# use serde::{Deserialize, Serialize};
+# use serde_with::{serde_as, DisplayFromStr};
+# use std::collections::HashMap;
+# use std::net::Ipv4Addr;
+#
+#[serde_as]
+# #[derive(Debug, PartialEq, Eq)]
+#[derive(Deserialize, Serialize)]
+struct Data {
+    // Type does not implement Serialize or Deserialize
+    #[serde_as(as = "DisplayFromStr")]
+    address: Ipv4Addr,
+    // Treat the Vec like a map with duplicates
+    // Convert u32 into a String and keep the String the same type
+    #[serde_as(as = "HashMap<DisplayFromStr, _>")]
+    vec_as_map: Vec<(u32, String)>,
+}
+
+let data = Data {
+    address: Ipv4Addr::new(192, 168, 0, 1),
+    vec_as_map: vec![
+        (123, "Hello".into()),
+        (456, "World".into()),
+        (123, "Hello".into()),
+    ],
+};
+
+let json = r#"{
+  "address": "192.168.0.1",
+  "vec_as_map": {
+    "123": "Hello",
+    "456": "World",
+    "123": "Hello"
+  }
+}"#;
+
+// Test Serialization
+assert_eq!(json, serde_json::to_string_pretty(&data).unwrap());
+// Test Deserialization
+assert_eq!(data, serde_json::from_str(json).unwrap());
+```
+
+## 2. Integration with serde's with-annotation
+
+[serde's with-annotation][with-annotation] allows specifying a different serialization or deserialization function for a field.
+It is useful to adapt the serialization of existing types to the requirements of a protocol.
+Most modules in this crate can be used together with the with-annotation.
+
+The annotation approach has one big drawback, in that it is very inflexible.
+It allows specifying arbitrary serialization code, but the code has to perform the correct transformations.
+It is not possible to combine multiple of those functions.
+One common use case for this is the serialization of collections like `Vec`.
+If you have a field of type `T`, you can apply the with-annotation, but if you have a field of type `Vec<T>`, there is no way to re-use the same functions for the with-annotation.
+This inflexibility is fixed in the `serde_as` scheme presented above.
+
+The example shows a similar setup as in the `serde_as` example above, but using the with-annotation.
+
+### Example
+
+```rust
+# use serde::{Deserialize, Serialize};
+# use std::net::Ipv4Addr;
+#
+# #[derive(Debug, PartialEq, Eq)]
+#[derive(Deserialize, Serialize)]
+struct Data {
+    // Type does not implement Serialize or Deserialize
+    #[serde(with = "serde_with::rust::display_fromstr")]
+    address: Ipv4Addr,
+    // Treat the Vec like a map with duplicates
+    #[serde(with = "serde_with::rust::tuple_list_as_map")]
+    vec_as_map: Vec<(String, u32)>,
+}
+
+let data = Data {
+    address: Ipv4Addr::new(192, 168, 0, 1),
+    vec_as_map: vec![
+        ("Hello".into(), 123),
+        ("World".into(), 456),
+        ("Hello".into(), 123),
+    ],
+};
+
+let json = r#"{
+  "address": "192.168.0.1",
+  "vec_as_map": {
+    "Hello": 123,
+    "World": 456,
+    "Hello": 123
+  }
+}"#;
+
+// Test Serialization
+assert_eq!(json, serde_json::to_string_pretty(&data).unwrap());
+// Test Deserialization
+assert_eq!(data, serde_json::from_str(json).unwrap());
+```
+
+## 3. proc-macros to make it easier to use both above parts
+
+The proc-macros are an optional addition and improve the user experience for common tasks.
+We have already seen how the `serde_as` attribute is used to define the serialization instructions.
+
+The proc-macro attributes are defined in the [`serde_with_macros`] crate and re-exported from the root of this crate.
+The proc-macros are optional, but enabled by default.
+For further details, please refer to the documentation of each proc-macro.
+
+## 4. Derive macros to implement `Deserialize` and `Serialize`
+
+The derive macros work similar to the serde provided ones, but they do implement other de/serialization schemes.
+For example, the derives [`DeserializeFromStr`] and [`SerializeDisplay`] require that the type also implement [`FromStr`] and [`Display`] and de/serializes from/to a string instead of the usual way of iterating over all fields.
+
+## Migrating from the with-annotations to `serde_as`
+
+Each old style module explains how it can be converted to `serde_as`.
+Not all modules have such a description since not all are migrated and some are hard to implement in the `serde_as` system.
+
+[`Display`]: std::fmt::Display
+[`FromStr`]: std::str::FromStr
+[`serde_with_macros`]: serde_with_macros
+[serde_with_chrono]: crate::chrono
+[with-annotation]: https://serde.rs/field-attrs.html#with
diff --git a/third_party/rust/serde_with/src/guide/feature_flags.md b/third_party/rust/serde_with/src/guide/feature_flags.md
new file mode 100644
index 0000000000..9e80177ad2
--- /dev/null
+++ b/third_party/rust/serde_with/src/guide/feature_flags.md
@@ -0,0 +1,62 @@
+# Available Feature Flags
+
+This crate has the following features which can be enabled.
+Each entry will explain the feature in more detail.
+
+1. [`base64`](#base64)
+2. [`chrono`](#chrono)
+3. [`guide`](#guide)
+4. [`hex`](#hex)
+5. [`indexmap`](#indexmap)
+6. [`json`](#json)
+7. [`macros`](#macros)
+8. [`time_0_3`](#time_0_3)
+
+## `base64`
+
+The `base64` feature enables serializing data in base64 format.
+
+This pulls in `base64` as a dependency.
+
+## `chrono`
+
+The `chrono` feature enables integration of `chrono` specific conversions.
+This includes support for the timestamp and duration types.
+
+This pulls in `chrono` as a dependency.
+
+## `guide`
+
+The `guide` feature enables inclusion of this user guide.
+The feature only changes the rustdoc output and enables no other effects.
+
+## `hex`
+
+The `hex` feature enables serializing data in hex format.
+
+This pulls in `hex` as a dependency.
+
+## `indexmap`
+
+The `indexmap` feature enables implementations of `indexmap` specific checks.
+This includes support for checking duplicate keys
+
+## `json`
+
+The `json` features enables JSON conversions from the `json` module.
+
+This pulls in `serde_json` as a dependency.
+
+## `macros`
+
+The `macros` features enables all helper macros and derives.
+It is enabled by default, since the macros provide a usability benefit, especially for `serde_as`.
+
+This pulls in `serde_with_macros` as a dependency.
+
+## `time_0_3`
+
+The `time_0_3` enables integration of `time` v0.3 specific conversions.
+This includes support for the timestamp and duration types.
+
+This pulls in `time` v0.3 as a dependency.
diff --git a/third_party/rust/serde_with/src/guide/serde_as.md b/third_party/rust/serde_with/src/guide/serde_as.md
new file mode 100644
index 0000000000..76275f0047
--- /dev/null
+++ b/third_party/rust/serde_with/src/guide/serde_as.md
@@ -0,0 +1,332 @@
+# `serde_as` Annotation
+
+This is an alternative to serde's with-annotation.
+It is more flexible and composable, but work with fewer types.
+
+The scheme is based on two new traits, [`SerializeAs`] and [`DeserializeAs`], which need to be implemented by all types which want to be compatible with `serde_as`.
+The proc-macro attribute [`#[serde_as]`][crate::serde_as] exists as a usability boost for users.
+The basic design of `serde_as` was developed by [@markazmierczak](https://github.com/markazmierczak).
+
+This page contains some general advice on the usage of `serde_as` and on implementing the necessary traits.  
+[**A list of all supported transformations enabled by `serde_as` is available on this page.**](crate::guide::serde_as_transformations)
+
+1. [Switching from serde's with to `serde_as`](#switching-from-serdes-with-to-serde_as)
+    1. [Deserializing Optional Fields](#deserializing-optional-fields)
+    2. [Gating `serde_as` on Features](#gating-serde_as-on-features)
+2. [Implementing `SerializeAs` / `DeserializeAs`](#implementing-serializeas--deserializeas)
+    1. [Using `#[serde_as]` on types without `SerializeAs` and `Serialize` implementations](#using-serde_as-on-types-without-serializeas-and-serialize-implementations)
+    2. [Using `#[serde_as]` with serde's remote derives](#using-serde_as-with-serdes-remote-derives)
+3. [Re-exporting `serde_as`](#re-exporting-serde_as)
+
+## Switching from serde's with to `serde_as`
+
+For the user, the main difference is that instead of
+
+```rust,ignore
+#[serde(with = "...")]
+```
+
+you now have to write
+
+```rust,ignore
+#[serde_as(as = "...")]
+```
+
+and place the `#[serde_as]` attribute *before* the `#[derive]` attribute.
+You still need the `#[derive(Serialize, Deserialize)]` on the struct/enum.
+
+All together, this looks like:
+
+```rust
+use serde::{Deserialize, Serialize};
+use serde_with::{serde_as, DisplayFromStr};
+
+#[serde_as]
+#[derive(Serialize, Deserialize)]
+struct A {
+    #[serde_as(as = "DisplayFromStr")]
+    mime: mime::Mime,
+}
+```
+
+The main advantage is that you can compose `serde_as` stuff, which is impossible with the with-annotation.
+For example, the `mime` field from above could be nested in one or more data structures:
+
+```rust
+# use std::collections::BTreeMap;
+# use serde::{Deserialize, Serialize};
+# use serde_with::{serde_as, DisplayFromStr};
+#
+#[serde_as]
+#[derive(Serialize, Deserialize)]
+struct A {
+    #[serde_as(as = "Option<BTreeMap<_, Vec<DisplayFromStr>>>")]
+    mime: Option<BTreeMap<String, Vec<mime::Mime>>>,
+}
+```
+
+### Deserializing Optional Fields
+
+During deserialization, serde treats fields of `Option<T>` as optional and does not require them to be present.
+This breaks when adding either the `serde_as` annotation or serde's `with` annotation.
+The default behavior can be restored by adding serde's `default` attribute.
+
+```rust
+# use serde::{Deserialize, Serialize};
+# use serde_with::{serde_as, DisplayFromStr};
+#
+#[serde_as]
+#[derive(Serialize, Deserialize)]
+struct A {
+    #[serde_as(as = "Option<DisplayFromStr>")]
+    // Allows deserialization without providing a value for `val`
+    #[serde(default)]
+    val: Option<u32>,
+}
+```
+
+In the future, this behavior might change and `default` would be applied on `Option<T>` fields.
+You can add your feedback at [serde_with#185].
+
+### Gating `serde_as` on Features
+
+Gating `serde_as` behind optional features is currently not supported.
+More details can be found in the corresponding issue [serde_with#355].
+
+```rust,ignore
+#[cfg_attr(feature="serde" ,serde_as)]
+#[cfg_attr(feature="serde", derive(Serialize, Deserialize))]
+struct StructC {
+    #[cfg_attr(feature="serde" ,serde_as(as = "Vec<(_, _)>"))]
+    map: HashMap<(i32,i32), i32>,
+}
+```
+
+The `serde_as` proc-macro attribute will not recognize the `serde_as` attribute on the field and will not perform the necessary translation steps.
+The problem can be avoided by forcing Rust to evaluate all cfg-expressions before running `serde_as`.
+This is possible with the `#[cfg_eval]` attribute, which is considered for stabilization ([rust#82679], [rust#87221]).
+
+As a workaround, it is possible to remove the `serde_as` proc-macro attribute and perform the transformation manually.
+The transformation steps are listed in the [`serde_as`] documentations.
+For the example above, this means to replace the field attribute with:
+
+```rust,ignore
+use serde_with::{As, Same};
+
+#[cfg_attr(feature="serde", serde(with = "As::<Vec<(Same, Same)>>"))]
+map: HashMap<(i32,i32), i32>,
+```
+
+[rust#82679]: https://github.com/rust-lang/rust/issues/82679
+[rust#87221]: https://github.com/rust-lang/rust/pull/87221
+[serde_with#355]: https://github.com/jonasbb/serde_with/issues/355
+
+## Implementing `SerializeAs` / `DeserializeAs`
+
+You can support [`SerializeAs`] / [`DeserializeAs`] on your own types too.
+Most "leaf" types do not need to implement these traits, since they are supported implicitly.
+"Leaf" type refers to types which directly serialize like plain data types.
+[`SerializeAs`] / [`DeserializeAs`] is very important for collection types, like `Vec` or `BTreeMap`, since they need special handling for the key/value de/serialization such that the conversions can be done on the key/values.
+You also find them implemented on the conversion types, such as the [`DisplayFromStr`] type.
+These make up the bulk of this crate and allow you to perform all the nice conversions to [hex strings], the [bytes to string converter], or [duration to UNIX epoch].
+
+In many cases, conversion is only required from one serializable type to another one, without requiring the full power of the `Serialize` or `Deserialize` traits.
+In these cases, the [`serde_conv!`] macro conveniently allows defining conversion types without the boilerplate.
+The documentation of [`serde_conv!`] contains more details how to use it.
+
+The trait documentations for [`SerializeAs`] and [`DeserializeAs`] describe in details how to implement them for container types like `Box` or `Vec` and other types.
+
+### Using `#[serde_as]` on types without `SerializeAs` and `Serialize` implementations
+
+The `SerializeAs` and `DeserializeAs` traits can easily be used together with types from other crates without running into orphan rule problems.
+This is a distinct advantage of the `serde_as` system.
+For this example we assume we have a type `RemoteType` from a dependency which does not implement `Serialize` nor `SerializeAs`.
+We assume we have a module containing a `serialize` and a `deserialize` function, which can be used in the `#[serde(with = "MODULE")]` annotation.
+You find an example in the [official serde documentation](https://serde.rs/custom-date-format.html).
+
+Our goal is to serialize this `Data` struct.
+Right now, we do not have anything we can use to replace `???` with, since `_` only works if `RemoteType` would implement `Serialize`, which it does not.
+
+```rust
+# #[cfg(FALSE)] {
+#[serde_as]
+#[derive(serde::Serialize)]
+struct Data {
+    #[serde_as(as = "Vec<???>")]
+    vec: Vec<RemoteType>,
+}
+# }
+```
+
+We need to create a new type for which we can implement `SerializeAs`, to replace the `???`.
+The `SerializeAs` implementation is **always** written for a local type.
+This allows it to seamlessly work with types from dependencies without running into orphan rule problems.
+
+```rust
+# #[cfg(FALSE)] {
+struct LocalType;
+
+impl SerializeAs<RemoteType> for LocalType {
+    fn serialize_as<S>(value: &RemoteType, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {  
+        MODULE::serialize(value, serializer)
+    }
+}
+
+impl<'de> DeserializeAs<'de, RemoteType> for LocalType {
+    fn deserialize_as<D>(deserializer: D) -> Result<RemoteType, D::Error>
+    where
+        D: Deserializer<'de>,
+    {  
+        MODULE::deserialize(deserializer)
+    }
+}
+# }
+```
+
+This is how the final implementation looks like.
+We assumed we have a module `MODULE` with a `serialize` function already, which we use here to provide the implementation.
+As can be seen, this is mostly boilerplate, since the most part is encapsulated in `$module::serialize`.
+The final `Data` struct will now look like:
+
+```rust
+# #[cfg(FALSE)] {
+#[serde_as]
+#[derive(serde::Serialize)]
+struct Data {
+    #[serde_as(as = "Vec<LocalType>")]
+    vec: Vec<RemoteType>,
+}
+# }
+```
+
+### Using `#[serde_as]` with serde's remote derives
+
+A special case of the above section is using it on remote derives.
+This is a special functionality of serde, where it derives the de/serialization code for a type from another crate if all fields are `pub`.
+You can find all the details in the [official serde documentation](https://serde.rs/remote-derive.html).
+
+```rust
+# #[cfg(FALSE)] {
+// Pretend that this is somebody else's crate, not a module.
+mod other_crate {
+    // Neither Serde nor the other crate provides Serialize and Deserialize
+    // impls for this struct.
+    pub struct Duration {
+        pub secs: i64,
+        pub nanos: i32,
+    }
+}
+
+////////////////////////////////////////////////////////////////////////////////
+
+use other_crate::Duration;
+
+// Serde calls this the definition of the remote type. It is just a copy of the
+// remote data structure. The `remote` attribute gives the path to the actual
+// type we intend to derive code for.
+#[derive(serde::Serialize, serde::Deserialize)]
+#[serde(remote = "Duration")]
+struct DurationDef {
+    secs: i64,
+    nanos: i32,
+}
+# }
+```
+
+Our goal is now to use `Duration` within `serde_as`.
+We use the existing `DurationDef` type and its `serialize` and `deserialize` functions.
+We can write this implementation.
+The implementation for `DeserializeAs` works analogue.
+
+```rust
+# #[cfg(FALSE)] {
+impl SerializeAs<Duration> for DurationDef {
+    fn serialize_as<S>(value: &Duration, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: serde::Serializer,
+    {  
+        DurationDef::serialize(value, serializer)
+    }
+}
+# }
+```
+
+This now allows us to use `Duration` for serialization.
+
+```rust
+# #[cfg(FALSE)] {
+use other_crate::Duration;
+
+#[serde_as]
+#[derive(serde::Serialize)]
+struct Data {
+    #[serde_as(as = "Vec<DurationDef>")]
+    vec: Vec<Duration>,
+}
+# }
+```
+
+## Re-exporting `serde_as`
+
+If `serde_as` is being used in a context where the `serde_with` crate is not available from the root
+path, but is re-exported at some other path, the `crate = "..."` attribute argument should be used
+to specify its path. This may be the case if `serde_as` is being used in a procedural macro -
+otherwise, users of that macro would need to add `serde_with` to their own Cargo manifest.
+
+The `crate` argument will generally be used in conjunction with [`serde`'s own `crate` argument].
+
+For example, a type definition may be defined in a procedural macro:
+
+```rust,ignore
+// some_other_lib_derive/src/lib.rs
+
+use proc_macro::TokenStream;
+use quote::quote;
+
+#[proc_macro]
+pub fn define_some_type(_item: TokenStream) -> TokenStream {
+    let def = quote! {
+        #[serde(crate = "::some_other_lib::serde")]
+        #[::some_other_lib::serde_with::serde_as(crate = "::some_other_lib::serde_with")]
+        #[derive(::some_other_lib::serde::Deserialize)]
+        struct Data {
+            #[serde_as(as = "_")]
+            a: u32,
+        }
+    };
+
+    TokenStream::from(def)
+}
+```
+
+This can be re-exported through a library which also re-exports `serde` and `serde_with`:
+
+```rust,ignore
+// some_other_lib/src/lib.rs
+
+pub use serde;
+pub use serde_with;
+pub use some_other_lib_derive::define_some_type;
+```
+
+The procedural macro can be used by other crates without any additional imports:
+
+```rust,ignore
+// consuming_crate/src/main.rs
+
+some_other_lib::define_some_type!();
+```
+
+[`DeserializeAs`]: crate::DeserializeAs
+[`DisplayFromStr`]: crate::DisplayFromStr
+[`serde_as`]: crate::serde_as
+[`serde_conv!`]: crate::serde_conv!
+[`serde`'s own `crate` argument]: https://serde.rs/container-attrs.html#crate
+[`SerializeAs`]: crate::SerializeAs
+[bytes to string converter]: crate::BytesOrString
+[duration to UNIX epoch]: crate::DurationSeconds
+[hex strings]: crate::hex::Hex
+[serde_with#185]: https://github.com/jonasbb/serde_with/issues/185
diff --git a/third_party/rust/serde_with/src/guide/serde_as_transformations.md b/third_party/rust/serde_with/src/guide/serde_as_transformations.md
new file mode 100644
index 0000000000..9be67e154b
--- /dev/null
+++ b/third_party/rust/serde_with/src/guide/serde_as_transformations.md
@@ -0,0 +1,518 @@
+# De/Serialize Transformations Available
+
+This page lists the transformations implemented in this crate and supported by `serde_as`.
+
+1. [Base64 encode bytes](#base64-encode-bytes)
+2. [Big Array support](#big-array-support)
+3. [`bool` from integer](#bool-from-integer)
+4. [Borrow from the input for `Cow` type](#borrow-from-the-input-for-cow-type)
+5. [`Bytes` with more efficiency](#bytes-with-more-efficiency)
+6. [Convert to an intermediate type using `Into`](#convert-to-an-intermediate-type-using-into)
+7. [Convert to an intermediate type using `TryInto`](#convert-to-an-intermediate-type-using-tryinto)
+8. [`Default` from `null`](#default-from-null)
+9. [De/Serialize into `Vec`, ignoring errors](#deserialize-into-vec-ignoring-errors)
+10. [De/Serialize with `FromStr` and `Display`](#deserialize-with-fromstr-and-display)
+11. [`Duration` as seconds](#duration-as-seconds)
+12. [Hex encode bytes](#hex-encode-bytes)
+13. [Ignore deserialization errors](#ignore-deserialization-errors)
+14. [`Maps` to `Vec` of enums](#maps-to-vec-of-enums)
+15. [`Maps` to `Vec` of tuples](#maps-to-vec-of-tuples)
+16. [`NaiveDateTime` like UTC timestamp](#naivedatetime-like-utc-timestamp)
+17. [`None` as empty `String`](#none-as-empty-string)
+18. [One or many elements into `Vec`](#one-or-many-elements-into-vec)
+19. [Pick first successful deserialization](#pick-first-successful-deserialization)
+20. [Timestamps as seconds since UNIX epoch](#timestamps-as-seconds-since-unix-epoch)
+21. [Value into JSON String](#value-into-json-string)
+22. [`Vec` of tuples to `Maps`](#vec-of-tuples-to-maps)
+23. [Well-known time formats for `OffsetDateTime`](#well-known-time-formats-for-offsetdatetime)
+
+## Base64 encode bytes
+
+[`Base64`]
+
+Requires the `base64` feature.
+The character set and padding behavior can be configured.
+
+```ignore
+// Rust
+#[serde_as(as = "serde_with::base64::Base64")]
+value: Vec<u8>,
+#[serde_as(as = "Base64<Bcrypt, Unpadded>")]
+bcrypt_unpadded: Vec<u8>,
+
+// JSON
+"value": "SGVsbG8gV29ybGQ=",
+"bcrypt_unpadded": "QETqZE6eT07wZEO",
+```
+
+## Big Array support
+
+Support for arrays of arbitrary size.
+
+```ignore
+// Rust
+#[serde_as(as = "[[_; 64]; 33]")]
+value: [[u8; 64]; 33],
+
+// JSON
+"value": [[0,0,0,0,0,...], [0,0,0,...], ...],
+```
+
+## `bool` from integer
+
+Deserialize an integer and convert it into a `bool`.
+[`BoolFromInt<Strict>`] (default) deserializes 0 to `false` and `1` to `true`, other numbers are errors.
+[`BoolFromInt<Flexible>`] deserializes any non-zero as `true`.
+Serialization only emits 0/1.
+
+```ignore
+// Rust
+#[serde_as(as = "BoolFromInt")] // BoolFromInt<Strict>
+b: bool,
+
+// JSON
+"b": 1,
+```
+
+## Borrow from the input for `Cow` type
+
+The types `Cow<'_, str>`, `Cow<'_, [u8]>`, or `Cow<'_, [u8; N]>` can borrow from the input, avoiding extra copies.
+
+```ignore
+// Rust
+#[serde_as(as = "BorrowCow")]
+value: Cow<'a, str>,
+
+// JSON
+"value": "foobar",
+```
+
+## `Bytes` with more efficiency
+
+[`Bytes`]
+
+More efficient serialization for byte slices and similar.
+
+```ignore
+// Rust
+#[serde_as(as = "Bytes")]
+value: Vec<u8>,
+
+// JSON
+"value": [0, 1, 2, 3, ...],
+```
+
+## Convert to an intermediate type using `Into`
+
+[`FromInto`]
+
+```ignore
+// Rust
+#[serde_as(as = "FromInto<(u8, u8, u8)>")]
+value: Rgb,
+
+impl From<(u8, u8, u8)> for Rgb { ... }
+impl From<Rgb> for (u8, u8, u8) { ... }
+
+// JSON
+"value": [128, 64, 32],
+```
+
+## Convert to an intermediate type using `TryInto`
+
+[`TryFromInto`]
+
+```ignore
+// Rust
+#[serde_as(as = "TryFromInto<i8>")]
+value: u8,
+
+// JSON
+"value": 127,
+```
+
+## `Default` from `null`
+
+[`DefaultOnNull`]
+
+```ignore
+// Rust
+#[serde_as(as = "DefaultOnNull")]
+value: u32,
+#[serde_as(as = "DefaultOnNull<DisplayFromStr>")]
+value2: u32,
+
+// JSON
+"value": 123,
+"value2": "999",
+
+// Deserializes null into the Default value, i.e.,
+null => 0
+```
+
+## De/Serialize into `Vec`, ignoring errors
+
+[`VecSkipError`]
+
+For formats with heterogenous-typed sequences, we can collect only the deserializable elements.
+This is also useful for unknown enum variants.
+
+```ignore
+#[derive(serde::Deserialize)]
+enum Color {
+    Red,
+    Green,
+    Blue,
+}
+
+// JSON
+"colors": ["Blue", "Yellow", "Green"],
+
+// Rust
+#[serde_as(as = "VecSkipError<_>")]
+colors: Vec<Color>,
+
+// => vec![Blue, Green]
+```
+
+## De/Serialize with `FromStr` and `Display`
+
+Useful if a type implements `FromStr` / `Display` but not `Deserialize` / `Serialize`.
+
+[`DisplayFromStr`]
+
+```ignore
+// Rust
+#[serde_as(as = "serde_with::DisplayFromStr")]
+value: u128,
+#[serde_as(as = "serde_with::DisplayFromStr")]
+mime: mime::Mime,
+
+// JSON
+"value": "340282366920938463463374607431768211455",
+"mime": "text/*",
+```
+
+## `Duration` as seconds
+
+[`DurationSeconds`]
+
+```ignore
+// Rust
+#[serde_as(as = "serde_with::DurationSeconds<u64>")]
+value: Duration,
+
+// JSON
+"value": 86400,
+```
+
+[`DurationSecondsWithFrac`] supports subsecond precision:
+
+```ignore
+// Rust
+#[serde_as(as = "serde_with::DurationSecondsWithFrac<f64>")]
+value: Duration,
+
+// JSON
+"value": 1.234,
+```
+
+Different serialization formats are possible:
+
+```ignore
+// Rust
+#[serde_as(as = "serde_with::DurationSecondsWithFrac<String>")]
+value: Duration,
+
+// JSON
+"value": "1.234",
+```
+
+The same conversions are also implemented for [`chrono::Duration`] with the `chrono` feature.
+
+The same conversions are also implemented for [`time::Duration`] with the `time_0_3` feature.
+
+## Hex encode bytes
+
+[`Hex`]
+
+Requires the `hex` feature.
+The hex string can use upper- and lowercase characters.
+
+```ignore
+// Rust
+#[serde_as(as = "serde_with::hex::Hex")]
+lowercase: Vec<u8>,
+#[serde_as(as = "serde_with::hex::Hex<serde_with::formats::Uppercase>")]
+uppercase: Vec<u8>,
+
+// JSON
+"lowercase": "deadbeef",
+"uppercase": "DEADBEEF",
+```
+
+## Ignore deserialization errors
+
+Check the documentation for [`DefaultOnError`].
+
+## `Maps` to `Vec` of enums
+
+[`EnumMap`]
+
+Combine multiple enum values into a single map.
+The key is the enum variant name, and the value is the variant value.
+This only works with [*externally tagged*] enums, the default enum representation.
+Other forms cannot be supported.
+
+```ignore
+enum EnumValue {
+    Int(i32),
+    String(String),
+    Unit,
+    Tuple(i32, String),
+    Struct {
+        a: i32,
+        b: String,
+    },
+}
+
+// Rust
+struct VecEnumValues (
+    #[serde_as(as = "EnumMap")]
+    Vec<EnumValue>,
+);
+
+VecEnumValues(vec![
+    EnumValue::Int(123),
+    EnumValue::String("Foo".to_string()),
+    EnumValue::Unit,
+    EnumValue::Tuple(1, "Bar".to_string()),
+    EnumValue::Struct {
+        a: 666,
+        b: "Baz".to_string(),
+    },
+])
+
+// JSON
+{
+  "Int": 123,
+  "String": "Foo",
+  "Unit": null,
+  "Tuple": [
+    1,
+    "Bar",
+  ],
+  "Struct": {
+    "a": 666,
+    "b": "Baz",
+  }
+}
+```
+
+[*externally tagged*]: https://serde.rs/enum-representations.html#externally-tagged
+
+## `Maps` to `Vec` of tuples
+
+```ignore
+// Rust
+#[serde_as(as = "Vec<(_, _)>")]
+value: HashMap<String, u32>, // also works with BTreeMap
+
+// JSON
+"value": [
+    ["hello", 1],
+    ["world", 2]
+],
+```
+
+The [inverse operation](#vec-of-tuples-to-maps) is also available.
+
+## `NaiveDateTime` like UTC timestamp
+
+Requires the `chrono` feature.
+
+```ignore
+// Rust
+#[serde_as(as = "chrono::DateTime<chrono::Utc>")]
+value: chrono::NaiveDateTime,
+
+// JSON
+"value": "1994-11-05T08:15:30Z",
+                             ^ Pretend DateTime is UTC
+```
+
+## `None` as empty `String`
+
+[`NoneAsEmptyString`]
+
+```ignore
+// Rust
+#[serde_as(as = "serde_with::NoneAsEmptyString")]
+value: Option<String>,
+
+// JSON
+"value": "", // converts to None
+
+"value": "Hello World!", // converts to Some
+```
+
+## One or many elements into `Vec`
+
+[`OneOrMany`]
+
+```ignore
+// Rust
+#[serde_as(as = "serde_with::OneOrMany<_>")]
+value: Vec<String>,
+
+// JSON
+"value": "", // Deserializes single elements
+
+"value": ["Hello", "World!"], // or lists of many
+```
+
+## Pick first successful deserialization
+
+[`PickFirst`]
+
+```ignore
+// Rust
+#[serde_as(as = "serde_with::PickFirst<(_, serde_with::DisplayFromStr)>")]
+value: u32,
+
+// JSON
+// serialize into
+"value": 666,
+// deserialize from either
+"value": 666,
+"value": "666",
+```
+
+## Timestamps as seconds since UNIX epoch
+
+[`TimestampSeconds`]
+
+```ignore
+// Rust
+#[serde_as(as = "serde_with::TimestampSeconds<i64>")]
+value: SystemTime,
+
+// JSON
+"value": 86400,
+```
+
+[`TimestampSecondsWithFrac`] supports subsecond precision:
+
+```ignore
+// Rust
+#[serde_as(as = "serde_with::TimestampSecondsWithFrac<f64>")]
+value: SystemTime,
+
+// JSON
+"value": 1.234,
+```
+
+Different serialization formats are possible:
+
+```ignore
+// Rust
+#[serde_as(as = "serde_with::TimestampSecondsWithFrac<String>")]
+value: SystemTime,
+
+// JSON
+"value": "1.234",
+```
+
+The same conversions are also implemented for [`chrono::DateTime<Utc>`], [`chrono::DateTime<Local>`], and [`chrono::NaiveDateTime`] with the `chrono` feature.
+
+The conversions are availble for [`time::OffsetDateTime`] and [`time::PrimitiveDateTime`] with the `time_0_3` feature enabled.
+
+## Value into JSON String
+
+Some JSON APIs are weird and return a JSON encoded string in a JSON response
+
+[`JsonString`]
+
+Requires the `json` feature.
+
+```ignore
+// Rust
+#[derive(Deserialize, Serialize)]
+struct OtherStruct {
+    value: usize,
+}
+
+#[serde_as(as = "serde_with::json::JsonString")]
+value: OtherStruct,
+
+// JSON
+"value": "{\"value\":5}",
+```
+
+## `Vec` of tuples to `Maps`
+
+```ignore
+// Rust
+#[serde_as(as = "HashMap<_, _>")] // also works with BTreeMap
+value: Vec<(String, u32)>,
+
+// JSON
+"value": {
+    "hello": 1,
+    "world": 2
+},
+```
+
+This operation is also available for other sequence types.
+This includes `BinaryHeap<(K, V)>`, `BTreeSet<(K, V)>`, `HashSet<(K, V)>`, `LinkedList<(K, V)>`, `VecDeque<(K, V)>`, `Option<(K, V)>` and `[(K, V); N]` for all sizes of N.
+
+The [inverse operation](#maps-to-vec-of-tuples) is also available.
+
+## Well-known time formats for `OffsetDateTime`
+
+[`time::OffsetDateTime`] can be serialized in string format in different well-known formats.
+Two formats are supported, [`time::format_description::well_known::Rfc2822`] and [`time::format_description::well_known::Rfc3339`].
+
+```ignore
+// Rust
+#[serde_as(as = "time::format_description::well_known::Rfc2822")]
+rfc_2822: OffsetDateTime,
+#[serde_as(as = "time::format_description::well_known::Rfc3339")]
+rfc_3339: OffsetDateTime,
+
+// JSON
+"rfc_2822": "Fri, 21 Nov 1997 09:55:06 -0600",
+"rfc_3339": "1997-11-21T09:55:06-06:00",
+```
+
+These conversions are availble with the `time_0_3` feature flag.
+
+[`Base64`]: crate::base64::Base64
+[`BoolFromInt<Flexible>`]: crate::BoolFromInt
+[`BoolFromInt<Strict>`]: crate::BoolFromInt
+[`Bytes`]: crate::Bytes
+[`chrono::DateTime<Local>`]: chrono_crate::DateTime
+[`chrono::DateTime<Utc>`]: chrono_crate::DateTime
+[`chrono::Duration`]: https://docs.rs/chrono/latest/chrono/struct.Duration.html
+[`chrono::NaiveDateTime`]: chrono_crate::NaiveDateTime
+[`DefaultOnError`]: crate::DefaultOnError
+[`DefaultOnNull`]: crate::DefaultOnNull
+[`DisplayFromStr`]: crate::DisplayFromStr
+[`DurationSeconds`]: crate::DurationSeconds
+[`DurationSecondsWithFrac`]: crate::DurationSecondsWithFrac
+[`EnumMap`]: crate::EnumMap
+[`FromInto`]: crate::FromInto
+[`Hex`]: crate::hex::Hex
+[`JsonString`]: crate::json::JsonString
+[`NoneAsEmptyString`]: crate::NoneAsEmptyString
+[`OneOrMany`]: crate::OneOrMany
+[`PickFirst`]: crate::PickFirst
+[`time::Duration`]: time_0_3::Duration
+[`time::format_description::well_known::Rfc2822`]: time_0_3::format_description::well_known::Rfc2822
+[`time::format_description::well_known::Rfc3339`]: time_0_3::format_description::well_known::Rfc3339
+[`time::OffsetDateTime`]: time_0_3::OffsetDateTime
+[`time::PrimitiveDateTime`]: time_0_3::PrimitiveDateTime
+[`TimestampSeconds`]: crate::TimestampSeconds
+[`TimestampSecondsWithFrac`]: crate::TimestampSecondsWithFrac
+[`TryFromInto`]: crate::TryFromInto
+[`VecSkipError`]: crate::VecSkipError
diff --git a/third_party/rust/serde_with/src/hex.rs b/third_party/rust/serde_with/src/hex.rs
new file mode 100644
index 0000000000..1937e35394
--- /dev/null
+++ b/third_party/rust/serde_with/src/hex.rs
@@ -0,0 +1,155 @@
+//! De/Serialization of hexadecimal encoded bytes
+//!
+//! This modules is only available when using the `hex` feature of the crate.
+//!
+//! Please check the documentation on the [`Hex`] type for details.
+
+use crate::{
+    de::DeserializeAs,
+    formats::{Format, Lowercase, Uppercase},
+    ser::SerializeAs,
+};
+use alloc::{borrow::Cow, format, vec::Vec};
+use core::{
+    convert::{TryFrom, TryInto},
+    marker::PhantomData,
+};
+use serde::{de::Error, Deserialize, Deserializer, Serializer};
+
+/// Serialize bytes as a hex string
+///
+/// The type serializes a sequence of bytes as a hexadecimal string.
+/// It works on any type implementing `AsRef<[u8]>` for serialization and `TryFrom<Vec<u8>>` for deserialization.
+///
+/// The format type parameter specifies if the hex string should use lower- or uppercase characters.
+/// Valid options are the types [`Lowercase`] and [`Uppercase`].
+/// Deserialization always supports lower- and uppercase characters, even mixed in one string.
+///
+/// # Example
+///
+/// ```rust
+/// # #[cfg(feature = "macros")] {
+/// # use serde::{Deserialize, Serialize};
+/// # use serde_json::json;
+/// # use serde_with::serde_as;
+/// #
+/// #[serde_as]
+/// # #[derive(Debug, PartialEq, Eq)]
+/// #[derive(Deserialize, Serialize)]
+/// struct BytesLowercase(
+///     // Equivalent to serde_with::hex::Hex<serde_with::formats::Lowercase>
+///     #[serde_as(as = "serde_with::hex::Hex")]
+///     Vec<u8>
+/// );
+///
+/// #[serde_as]
+/// # #[derive(Debug, PartialEq, Eq)]
+/// #[derive(Deserialize, Serialize)]
+/// struct BytesUppercase(
+///     #[serde_as(as = "serde_with::hex::Hex<serde_with::formats::Uppercase>")]
+///     Vec<u8>
+/// );
+///
+/// let b = b"Hello World!";
+///
+/// // Hex with lowercase letters
+/// assert_eq!(
+///     json!("48656c6c6f20576f726c6421"),
+///     serde_json::to_value(BytesLowercase(b.to_vec())).unwrap()
+/// );
+/// // Hex with uppercase letters
+/// assert_eq!(
+///     json!("48656C6C6F20576F726C6421"),
+///     serde_json::to_value(BytesUppercase(b.to_vec())).unwrap()
+/// );
+///
+/// // Serialization always work from lower- and uppercase characters, even mixed case.
+/// assert_eq!(
+///     BytesLowercase(vec![0x00, 0xaa, 0xbc, 0x99, 0xff]),
+///     serde_json::from_value(json!("00aAbc99FF")).unwrap()
+/// );
+/// assert_eq!(
+///     BytesUppercase(vec![0x00, 0xaa, 0xbc, 0x99, 0xff]),
+///     serde_json::from_value(json!("00aAbc99FF")).unwrap()
+/// );
+///
+/// #[serde_as]
+/// # #[derive(Debug, PartialEq, Eq)]
+/// #[derive(Deserialize, Serialize)]
+/// struct ByteArray(
+///     // Equivalent to serde_with::hex::Hex<serde_with::formats::Lowercase>
+///     #[serde_as(as = "serde_with::hex::Hex")]
+///     [u8; 12]
+/// );
+///
+/// let b = b"Hello World!";
+///
+/// assert_eq!(
+///     json!("48656c6c6f20576f726c6421"),
+///     serde_json::to_value(ByteArray(b.clone())).unwrap()
+/// );
+///
+/// // Serialization always work from lower- and uppercase characters, even mixed case.
+/// assert_eq!(
+///     ByteArray([0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0xaa, 0xbc, 0x99, 0xff]),
+///     serde_json::from_value(json!("0011223344556677aAbc99FF")).unwrap()
+/// );
+///
+/// // Remember that the conversion may fail. (The following errors are specific to fixed-size arrays)
+/// let error_result: Result<ByteArray, _> = serde_json::from_value(json!("42")); // Too short
+/// error_result.unwrap_err();
+///
+/// let error_result: Result<ByteArray, _> =
+///     serde_json::from_value(json!("000000000000000000000000000000")); // Too long
+/// error_result.unwrap_err();
+/// # }
+/// ```
+#[derive(Copy, Clone, Debug, Default)]
+pub struct Hex<FORMAT: Format = Lowercase>(PhantomData<FORMAT>);
+
+impl<T> SerializeAs<T> for Hex<Lowercase>
+where
+    T: AsRef<[u8]>,
+{
+    fn serialize_as<S>(source: &T, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        serializer.serialize_str(&hex::encode(source))
+    }
+}
+
+impl<T> SerializeAs<T> for Hex<Uppercase>
+where
+    T: AsRef<[u8]>,
+{
+    fn serialize_as<S>(source: &T, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        serializer.serialize_str(&hex::encode_upper(source))
+    }
+}
+
+impl<'de, T, FORMAT> DeserializeAs<'de, T> for Hex<FORMAT>
+where
+    T: TryFrom<Vec<u8>>,
+    FORMAT: Format,
+{
+    fn deserialize_as<D>(deserializer: D) -> Result<T, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        <Cow<'de, str> as Deserialize<'de>>::deserialize(deserializer)
+            .and_then(|s| hex::decode(&*s).map_err(Error::custom))
+            .and_then(|vec: Vec<u8>| {
+                let length = vec.len();
+                vec.try_into().map_err(|_e: T::Error| {
+                    Error::custom(format!(
+                        "Can't convert a Byte Vector of length {} to the output type.",
+                        length
+                    ))
+                })
+            })
+    }
+}
diff --git a/third_party/rust/serde_with/src/json.rs b/third_party/rust/serde_with/src/json.rs
new file mode 100644
index 0000000000..699d31c8d2
--- /dev/null
+++ b/third_party/rust/serde_with/src/json.rs
@@ -0,0 +1,150 @@
+//! De/Serialization of JSON
+//!
+//! This modules is only available when using the `json` feature of the crate.
+
+use crate::{de::DeserializeAs, ser::SerializeAs};
+use serde::{de::DeserializeOwned, Deserializer, Serialize, Serializer};
+
+/// Serialize value as string containing JSON
+///
+/// The same functionality is also available as [`serde_with::json::JsonString`][crate::json::JsonString] compatible with the `serde_as`-annotation.
+///
+/// # Examples
+///
+/// ```
+/// # use serde::{Deserialize, Serialize};
+/// #
+/// #[derive(Deserialize, Serialize)]
+/// struct A {
+///     #[serde(with = "serde_with::json::nested")]
+///     other_struct: B,
+/// }
+/// #[derive(Deserialize, Serialize)]
+/// struct B {
+///     value: usize,
+/// }
+///
+/// let v: A = serde_json::from_str(r#"{"other_struct":"{\"value\":5}"}"#).unwrap();
+/// assert_eq!(5, v.other_struct.value);
+///
+/// let x = A {
+///     other_struct: B { value: 10 },
+/// };
+/// assert_eq!(
+///     r#"{"other_struct":"{\"value\":10}"}"#,
+///     serde_json::to_string(&x).unwrap()
+/// );
+/// ```
+pub mod nested {
+    use core::{fmt, marker::PhantomData};
+    use serde::{
+        de::{DeserializeOwned, Deserializer, Error, Visitor},
+        ser::{self, Serialize, Serializer},
+    };
+
+    /// Deserialize value from a string which is valid JSON
+    pub fn deserialize<'de, D, T>(deserializer: D) -> Result<T, D::Error>
+    where
+        D: Deserializer<'de>,
+        T: DeserializeOwned,
+    {
+        #[derive(Default)]
+        struct Helper<S: DeserializeOwned>(PhantomData<S>);
+
+        impl<'de, S> Visitor<'de> for Helper<S>
+        where
+            S: DeserializeOwned,
+        {
+            type Value = S;
+
+            fn expecting(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
+                write!(formatter, "valid json object")
+            }
+
+            fn visit_str<E>(self, value: &str) -> Result<S, E>
+            where
+                E: Error,
+            {
+                serde_json::from_str(value).map_err(Error::custom)
+            }
+        }
+
+        deserializer.deserialize_str(Helper(PhantomData))
+    }
+
+    /// Serialize value as string containing JSON
+    ///
+    /// # Errors
+    ///
+    /// Serialization can fail if `T`'s implementation of `Serialize` decides to
+    /// fail, or if `T` contains a map with non-string keys.
+    pub fn serialize<T, S>(value: &T, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        T: Serialize,
+        S: Serializer,
+    {
+        let s = serde_json::to_string(value).map_err(ser::Error::custom)?;
+        serializer.serialize_str(&*s)
+    }
+}
+
+/// Serialize value as string containing JSON
+///
+/// The same functionality is also available as [`serde_with::json::nested`][crate::json::nested] compatible with serde's with-annotation.
+///
+/// # Examples
+///
+/// ```
+/// # #[cfg(feature = "macros")] {
+/// # use serde::{Deserialize, Serialize};
+/// # use serde_with::{serde_as, json::JsonString};
+/// #
+/// #[serde_as]
+/// #[derive(Deserialize, Serialize)]
+/// struct A {
+///     #[serde_as(as = "JsonString")]
+///     other_struct: B,
+/// }
+/// #[derive(Deserialize, Serialize)]
+/// struct B {
+///     value: usize,
+/// }
+///
+/// let v: A = serde_json::from_str(r#"{"other_struct":"{\"value\":5}"}"#).unwrap();
+/// assert_eq!(5, v.other_struct.value);
+///
+/// let x = A {
+///     other_struct: B { value: 10 },
+/// };
+/// assert_eq!(
+///     r#"{"other_struct":"{\"value\":10}"}"#,
+///     serde_json::to_string(&x).unwrap()
+/// );
+/// # }
+/// ```
+#[derive(Copy, Clone, Debug, Default)]
+pub struct JsonString;
+
+impl<T> SerializeAs<T> for JsonString
+where
+    T: Serialize,
+{
+    fn serialize_as<S>(source: &T, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        crate::json::nested::serialize(source, serializer)
+    }
+}
+
+impl<'de, T> DeserializeAs<'de, T> for JsonString
+where
+    T: DeserializeOwned,
+{
+    fn deserialize_as<D>(deserializer: D) -> Result<T, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        crate::json::nested::deserialize(deserializer)
+    }
+}
diff --git a/third_party/rust/serde_with/src/lib.rs b/third_party/rust/serde_with/src/lib.rs
new file mode 100644
index 0000000000..6285a6f695
--- /dev/null
+++ b/third_party/rust/serde_with/src/lib.rs
@@ -0,0 +1,2034 @@
+#![warn(
+    clippy::semicolon_if_nothing_returned,
+    missing_copy_implementations,
+    // missing_crate_level_docs, not available in MSRV
+    missing_debug_implementations,
+    missing_docs,
+    rust_2018_idioms,
+    trivial_casts,
+    trivial_numeric_casts,
+    unused_extern_crates,
+    unused_import_braces,
+    unused_qualifications,
+    variant_size_differences
+)]
+#![doc(test(attr(forbid(unsafe_code))))]
+#![doc(test(attr(deny(
+    missing_copy_implementations,
+    missing_debug_implementations,
+    trivial_casts,
+    trivial_numeric_casts,
+    unused_extern_crates,
+    unused_import_braces,
+    unused_qualifications,
+))))]
+#![doc(test(attr(warn(rust_2018_idioms))))]
+// Not needed for 2018 edition and conflicts with `rust_2018_idioms`
+#![doc(test(no_crate_inject))]
+#![doc(html_root_url = "https://docs.rs/serde_with/1.14.0")]
+#![cfg_attr(docsrs, feature(doc_cfg))]
+#![allow(
+    // clippy is broken and shows wrong warnings
+    // clippy on stable does not know yet about the lint name
+    unknown_lints,
+    // https://github.com/rust-lang/rust-clippy/issues/8560
+    clippy::only_used_in_recursion,
+    // https://github.com/rust-lang/rust-clippy/issues/8867
+    clippy::derive_partial_eq_without_eq,
+)]
+#![no_std]
+
+//! [![crates.io badge](https://img.shields.io/crates/v/serde_with.svg)](https://crates.io/crates/serde_with/)
+//! [![Build Status](https://github.com/jonasbb/serde_with/workflows/Rust%20CI/badge.svg)](https://github.com/jonasbb/serde_with)
+//! [![codecov](https://codecov.io/gh/jonasbb/serde_with/branch/master/graph/badge.svg)](https://codecov.io/gh/jonasbb/serde_with)
+//! [![CII Best Practices](https://bestpractices.coreinfrastructure.org/projects/4322/badge)](https://bestpractices.coreinfrastructure.org/projects/4322)
+//! [![Binder](https://img.shields.io/badge/Try%20on%20-binder-579ACA.svg?logo=data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAFkAAABZCAMAAABi1XidAAAB8lBMVEX///9XmsrmZYH1olJXmsr1olJXmsrmZYH1olJXmsr1olJXmsrmZYH1olL1olJXmsr1olJXmsrmZYH1olL1olJXmsrmZYH1olJXmsr1olL1olJXmsrmZYH1olL1olJXmsrmZYH1olL1olL0nFf1olJXmsrmZYH1olJXmsq8dZb1olJXmsrmZYH1olJXmspXmspXmsr1olL1olJXmsrmZYH1olJXmsr1olL1olJXmsrmZYH1olL1olLeaIVXmsrmZYH1olL1olL1olJXmsrmZYH1olLna31Xmsr1olJXmsr1olJXmsrmZYH1olLqoVr1olJXmsr1olJXmsrmZYH1olL1olKkfaPobXvviGabgadXmsqThKuofKHmZ4Dobnr1olJXmsr1olJXmspXmsr1olJXmsrfZ4TuhWn1olL1olJXmsqBi7X1olJXmspZmslbmMhbmsdemsVfl8ZgmsNim8Jpk8F0m7R4m7F5nLB6jbh7jbiDirOEibOGnKaMhq+PnaCVg6qWg6qegKaff6WhnpKofKGtnomxeZy3noG6dZi+n3vCcpPDcpPGn3bLb4/Mb47UbIrVa4rYoGjdaIbeaIXhoWHmZYHobXvpcHjqdHXreHLroVrsfG/uhGnuh2bwj2Hxk17yl1vzmljzm1j0nlX1olL3AJXWAAAAbXRSTlMAEBAQHx8gICAuLjAwMDw9PUBAQEpQUFBXV1hgYGBkcHBwcXl8gICAgoiIkJCQlJicnJ2goKCmqK+wsLC4usDAwMjP0NDQ1NbW3Nzg4ODi5+3v8PDw8/T09PX29vb39/f5+fr7+/z8/Pz9/v7+zczCxgAABC5JREFUeAHN1ul3k0UUBvCb1CTVpmpaitAGSLSpSuKCLWpbTKNJFGlcSMAFF63iUmRccNG6gLbuxkXU66JAUef/9LSpmXnyLr3T5AO/rzl5zj137p136BISy44fKJXuGN/d19PUfYeO67Znqtf2KH33Id1psXoFdW30sPZ1sMvs2D060AHqws4FHeJojLZqnw53cmfvg+XR8mC0OEjuxrXEkX5ydeVJLVIlV0e10PXk5k7dYeHu7Cj1j+49uKg7uLU61tGLw1lq27ugQYlclHC4bgv7VQ+TAyj5Zc/UjsPvs1sd5cWryWObtvWT2EPa4rtnWW3JkpjggEpbOsPr7F7EyNewtpBIslA7p43HCsnwooXTEc3UmPmCNn5lrqTJxy6nRmcavGZVt/3Da2pD5NHvsOHJCrdc1G2r3DITpU7yic7w/7Rxnjc0kt5GC4djiv2Sz3Fb2iEZg41/ddsFDoyuYrIkmFehz0HR2thPgQqMyQYb2OtB0WxsZ3BeG3+wpRb1vzl2UYBog8FfGhttFKjtAclnZYrRo9ryG9uG/FZQU4AEg8ZE9LjGMzTmqKXPLnlWVnIlQQTvxJf8ip7VgjZjyVPrjw1te5otM7RmP7xm+sK2Gv9I8Gi++BRbEkR9EBw8zRUcKxwp73xkaLiqQb+kGduJTNHG72zcW9LoJgqQxpP3/Tj//c3yB0tqzaml05/+orHLksVO+95kX7/7qgJvnjlrfr2Ggsyx0eoy9uPzN5SPd86aXggOsEKW2Prz7du3VID3/tzs/sSRs2w7ovVHKtjrX2pd7ZMlTxAYfBAL9jiDwfLkq55Tm7ifhMlTGPyCAs7RFRhn47JnlcB9RM5T97ASuZXIcVNuUDIndpDbdsfrqsOppeXl5Y+XVKdjFCTh+zGaVuj0d9zy05PPK3QzBamxdwtTCrzyg/2Rvf2EstUjordGwa/kx9mSJLr8mLLtCW8HHGJc2R5hS219IiF6PnTusOqcMl57gm0Z8kanKMAQg0qSyuZfn7zItsbGyO9QlnxY0eCuD1XL2ys/MsrQhltE7Ug0uFOzufJFE2PxBo/YAx8XPPdDwWN0MrDRYIZF0mSMKCNHgaIVFoBbNoLJ7tEQDKxGF0kcLQimojCZopv0OkNOyWCCg9XMVAi7ARJzQdM2QUh0gmBozjc3Skg6dSBRqDGYSUOu66Zg+I2fNZs/M3/f/Grl/XnyF1Gw3VKCez0PN5IUfFLqvgUN4C0qNqYs5YhPL+aVZYDE4IpUk57oSFnJm4FyCqqOE0jhY2SMyLFoo56zyo6becOS5UVDdj7Vih0zp+tcMhwRpBeLyqtIjlJKAIZSbI8SGSF3k0pA3mR5tHuwPFoa7N7reoq2bqCsAk1HqCu5uvI1n6JuRXI+S1Mco54YmYTwcn6Aeic+kssXi8XpXC4V3t7/ADuTNKaQJdScAAAAAElFTkSuQmCC)](https://mybinder.org/v2/gist/jonasbb/18b9aece4c17f617b1c2b3946d29eeb0/HEAD?filepath=serde-with-demo.ipynb)
+//!
+//! ---
+//!
+//! This crate provides custom de/serialization helpers to use in combination with [serde's with-annotation][with-annotation] and with the improved [`serde_as`][as-annotation]-annotation.
+//! Some common use cases are:
+//!
+//! * De/Serializing a type using the `Display` and `FromStr` traits, e.g., for `u8`, `url::Url`, or `mime::Mime`.
+//!      Check [`DisplayFromStr`][] or [`serde_with::rust::display_fromstr`][display_fromstr] for details.
+//! * Support for arrays larger than 32 elements or using const generics.
+//!     With `serde_as` large arrays are supported, even if they are nested in other types.
+//!     `[bool; 64]`, `Option<[u8; M]>`, and `Box<[[u8; 64]; N]>` are all supported, as [this examples shows](#large-and-const-generic-arrays).
+//! * Skip serializing all empty `Option` types with [`#[skip_serializing_none]`][skip_serializing_none].
+//! * Apply a prefix to each field name of a struct, without changing the de/serialize implementations of the struct using [`with_prefix!`][].
+//! * Deserialize a comma separated list like `#hash,#tags,#are,#great` into a `Vec<String>`.
+//!      Check the documentation for [`serde_with::rust::StringWithSeparator::<CommaSeparator>`][StringWithSeparator].
+//!
+//! ## Getting Help
+//!
+//! **Check out the [user guide][user guide] to find out more tips and tricks about this crate.**
+//!
+//! For further help using this crate you can [open a new discussion](https://github.com/jonasbb/serde_with/discussions/new) or ask on [users.rust-lang.org](https://users.rust-lang.org/).
+//! For bugs, please open a [new issue](https://github.com/jonasbb/serde_with/issues/new) on GitHub.
+//!
+//! # Use `serde_with` in your Project
+//!
+//! Add this to your `Cargo.toml`:
+//!
+//! ```toml
+//! [dependencies.serde_with]
+//! version = "1.14.0"
+//! features = [ "..." ]
+//! ```
+//!
+//! The crate contains different features for integration with other common crates.
+//! Check the [feature flags][] section for information about all available features.
+//!
+//! # Examples
+//!
+//! Annotate your struct or enum to enable the custom de/serializer.
+//! The `#[serde_as]` attribute must be place *before* the `#[derive]`.
+//!
+//! ## `DisplayFromStr`
+//!
+//! ```rust
+//! # #[cfg(feature = "macros")]
+//! # use serde::{Deserialize, Serialize};
+//! # #[cfg(feature = "macros")]
+//! # use serde_with::{serde_as, DisplayFromStr};
+//! # #[cfg(feature = "macros")]
+//! #[serde_as]
+//! # #[derive(Debug, Eq, PartialEq)]
+//! #[derive(Deserialize, Serialize)]
+//! struct Foo {
+//!     // Serialize with Display, deserialize with FromStr
+//!     #[serde_as(as = "DisplayFromStr")]
+//!     bar: u8,
+//! }
+//!
+//! # #[cfg(all(feature = "macros", feature = "json"))] {
+//! // This will serialize
+//! # let foo =
+//! Foo {bar: 12}
+//! # ;
+//!
+//! // into this JSON
+//! # let json = r#"
+//! {"bar": "12"}
+//! # "#;
+//! # assert_eq!(json.replace(" ", "").replace("\n", ""), serde_json::to_string(&foo).unwrap());
+//! # assert_eq!(foo, serde_json::from_str(&json).unwrap());
+//! # }
+//! ```
+//!
+//! ## Large and const-generic arrays
+//!
+//! serde does not support arrays with more than 32 elements or using const-generics.
+//! The `serde_as` attribute allows circumventing this restriction, even for nested types and nested arrays.
+//!
+//! ```rust
+//! # #[cfg(FALSE)] {
+//! # #[cfg(feature = "macros")]
+//! # use serde::{Deserialize, Serialize};
+//! # #[cfg(feature = "macros")]
+//! # use serde_with::serde_as;
+//! # #[cfg(feature = "macros")]
+//! #[serde_as]
+//! # #[derive(Debug, Eq, PartialEq)]
+//! #[derive(Deserialize, Serialize)]
+//! struct Arrays<const N: usize, const M: usize> {
+//!     #[serde_as(as = "[_; N]")]
+//!     constgeneric: [bool; N],
+//!
+//!     #[serde_as(as = "Box<[[_; 64]; N]>")]
+//!     nested: Box<[[u8; 64]; N]>,
+//!
+//!     #[serde_as(as = "Option<[_; M]>")]
+//!     optional: Option<[u8; M]>,
+//! }
+//!
+//! # #[cfg(all(feature = "macros", feature = "json"))] {
+//! // This allows us to serialize a struct like this
+//! let arrays: Arrays<100, 128> = Arrays {
+//!     constgeneric: [true; 100],
+//!     nested: Box::new([[111; 64]; 100]),
+//!     optional: Some([222; 128])
+//! };
+//! assert!(serde_json::to_string(&arrays).is_ok());
+//! # }
+//! # }
+//! ```
+//!
+//! ## `skip_serializing_none`
+//!
+//! This situation often occurs with JSON, but other formats also support optional fields.
+//! If many fields are optional, putting the annotations on the structs can become tedious.
+//! The `#[skip_serializing_none]` attribute must be place *before* the `#[derive]`.
+//!
+//! ```rust
+//! # #[cfg(feature = "macros")]
+//! # use serde::{Deserialize, Serialize};
+//! # #[cfg(feature = "macros")]
+//! # use serde_with::skip_serializing_none;
+//! # #[cfg(feature = "macros")]
+//! #[skip_serializing_none]
+//! # #[derive(Debug, Eq, PartialEq)]
+//! #[derive(Deserialize, Serialize)]
+//! struct Foo {
+//!     a: Option<usize>,
+//!     b: Option<usize>,
+//!     c: Option<usize>,
+//!     d: Option<usize>,
+//!     e: Option<usize>,
+//!     f: Option<usize>,
+//!     g: Option<usize>,
+//! }
+//!
+//! # #[cfg(all(feature = "macros", feature = "json"))] {
+//! // This will serialize
+//! # let foo =
+//! Foo {a: None, b: None, c: None, d: Some(4), e: None, f: None, g: Some(7)}
+//! # ;
+//!
+//! // into this JSON
+//! # let json = r#"
+//! {"d": 4, "g": 7}
+//! # "#;
+//! # assert_eq!(json.replace(" ", "").replace("\n", ""), serde_json::to_string(&foo).unwrap());
+//! # assert_eq!(foo, serde_json::from_str(&json).unwrap());
+//! # }
+//! ```
+//!
+//! ## Advanced `serde_as` usage
+//!
+//! This example is mainly supposed to highlight the flexibility of the `serde_as`-annotation compared to [serde's with-annotation][with-annotation].
+//! More details about `serde_as` can be found in the [user guide][].
+//!
+//! ```rust
+//! # #[cfg(all(feature = "macros", feature = "hex"))]
+//! # use {
+//! #     serde::{Deserialize, Serialize},
+//! #     serde_with::{serde_as, DisplayFromStr, DurationSeconds, hex::Hex},
+//! #     std::time::Duration,
+//! #     std::collections::BTreeMap,
+//! # };
+//! # #[cfg(all(feature = "macros", feature = "hex"))]
+//! #[serde_as]
+//! # #[derive(Debug, Eq, PartialEq)]
+//! #[derive(Deserialize, Serialize)]
+//! struct Foo {
+//!      // Serialize them into a list of number as seconds
+//!      #[serde_as(as = "Vec<DurationSeconds>")]
+//!      durations: Vec<Duration>,
+//!      // We can treat a Vec like a map with duplicates.
+//!      // JSON only allows string keys, so convert i32 to strings
+//!      // The bytes will be hex encoded
+//!      #[serde_as(as = "BTreeMap<DisplayFromStr, Hex>")]
+//!      bytes: Vec<(i32, Vec<u8>)>,
+//! }
+//!
+//! # #[cfg(all(feature = "macros", feature = "json", feature = "hex"))] {
+//! // This will serialize
+//! # let foo =
+//! Foo {
+//!     durations: vec![Duration::new(5, 0), Duration::new(3600, 0), Duration::new(0, 0)],
+//!     bytes: vec![
+//!         (1, vec![0, 1, 2]),
+//!         (-100, vec![100, 200, 255]),
+//!         (1, vec![0, 111, 222]),
+//!     ],
+//! }
+//! # ;
+//!
+//! // into this JSON
+//! # let json = r#"
+//! {
+//!     "durations": [5, 3600, 0],
+//!     "bytes": {
+//!         "1": "000102",
+//!         "-100": "64c8ff",
+//!         "1": "006fde"
+//!     }
+//! }
+//! # "#;
+//! # assert_eq!(json.replace(" ", "").replace("\n", ""), serde_json::to_string(&foo).unwrap());
+//! # assert_eq!(foo, serde_json::from_str(&json).unwrap());
+//! # }
+//! ```
+//!
+//! [`DisplayFromStr`]: https://docs.rs/serde_with/1.14.0/serde_with/struct.DisplayFromStr.html
+//! [`with_prefix!`]: https://docs.rs/serde_with/1.14.0/serde_with/macro.with_prefix.html
+//! [display_fromstr]: https://docs.rs/serde_with/1.14.0/serde_with/rust/display_fromstr/index.html
+//! [feature flags]: https://docs.rs/serde_with/1.14.0/serde_with/guide/feature_flags/index.html
+//! [skip_serializing_none]: https://docs.rs/serde_with/1.14.0/serde_with/attr.skip_serializing_none.html
+//! [StringWithSeparator]: https://docs.rs/serde_with/1.14.0/serde_with/rust/struct.StringWithSeparator.html
+//! [user guide]: https://docs.rs/serde_with/1.14.0/serde_with/guide/index.html
+//! [with-annotation]: https://serde.rs/field-attrs.html#with
+//! [as-annotation]: https://docs.rs/serde_with/1.14.0/serde_with/guide/serde_as/index.html
+
+extern crate alloc;
+#[doc(hidden)]
+pub extern crate serde;
+extern crate std;
+
+#[cfg(feature = "base64")]
+#[cfg_attr(docsrs, doc(cfg(feature = "base64")))]
+pub mod base64;
+#[cfg(feature = "chrono")]
+#[cfg_attr(docsrs, doc(cfg(feature = "chrono")))]
+pub mod chrono;
+mod content;
+pub mod de;
+mod duplicate_key_impls;
+mod enum_map;
+mod flatten_maybe;
+pub mod formats;
+#[cfg(feature = "hex")]
+#[cfg_attr(docsrs, doc(cfg(feature = "hex")))]
+pub mod hex;
+#[cfg(feature = "json")]
+#[cfg_attr(docsrs, doc(cfg(feature = "json")))]
+pub mod json;
+pub mod rust;
+pub mod ser;
+mod serde_conv;
+#[cfg(feature = "time_0_3")]
+#[cfg_attr(docsrs, doc(cfg(feature = "time_0_3")))]
+pub mod time_0_3;
+mod utils;
+#[doc(hidden)]
+pub mod with_prefix;
+
+// Taken from shepmaster/snafu
+// Originally licensed as MIT+Apache 2
+// https://github.com/shepmaster/snafu/blob/fd37d79d4531ed1d3eebffad0d658928eb860cfe/src/lib.rs#L121-L165
+#[cfg(feature = "guide")]
+#[allow(unused_macro_rules)]
+macro_rules! generate_guide {
+    (pub mod $name:ident; $($rest:tt)*) => {
+        generate_guide!(@gen ".", pub mod $name { } $($rest)*);
+    };
+    (pub mod $name:ident { $($children:tt)* } $($rest:tt)*) => {
+        generate_guide!(@gen ".", pub mod $name { $($children)* } $($rest)*);
+    };
+    (@gen $prefix:expr, ) => {};
+    (@gen $prefix:expr, pub mod $name:ident; $($rest:tt)*) => {
+        generate_guide!(@gen $prefix, pub mod $name { } $($rest)*);
+    };
+    (@gen $prefix:expr, @code pub mod $name:ident; $($rest:tt)*) => {
+        pub mod $name;
+        generate_guide!(@gen $prefix, $($rest)*);
+    };
+    (@gen $prefix:expr, pub mod $name:ident { $($children:tt)* } $($rest:tt)*) => {
+        doc_comment::doc_comment! {
+            include_str!(concat!($prefix, "/", stringify!($name), ".md")),
+            pub mod $name {
+                generate_guide!(@gen concat!($prefix, "/", stringify!($name)), $($children)*);
+            }
+        }
+        generate_guide!(@gen $prefix, $($rest)*);
+    };
+}
+
+#[cfg(feature = "guide")]
+generate_guide! {
+    pub mod guide {
+        pub mod feature_flags;
+        pub mod serde_as;
+        pub mod serde_as_transformations;
+    }
+}
+
+#[doc(inline)]
+pub use crate::{
+    de::DeserializeAs, enum_map::EnumMap, rust::StringWithSeparator, ser::SerializeAs,
+};
+use core::marker::PhantomData;
+use serde::{Deserialize, Deserializer, Serialize, Serializer};
+// Re-Export all proc_macros, as these should be seen as part of the serde_with crate
+#[cfg(feature = "macros")]
+#[cfg_attr(docsrs, doc(cfg(feature = "macros")))]
+#[doc(inline)]
+pub use serde_with_macros::*;
+
+/// Separator for string-based collection de/serialization
+pub trait Separator {
+    /// Return the string delimiting two elements in the string-based collection
+    fn separator() -> &'static str;
+}
+
+/// Predefined separator using a single space
+#[derive(Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash, Debug, Default)]
+pub struct SpaceSeparator;
+
+impl Separator for SpaceSeparator {
+    #[inline]
+    fn separator() -> &'static str {
+        " "
+    }
+}
+
+/// Predefined separator using a single comma
+#[derive(Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash, Debug, Default)]
+pub struct CommaSeparator;
+
+impl Separator for CommaSeparator {
+    #[inline]
+    fn separator() -> &'static str {
+        ","
+    }
+}
+
+/// Adapter to convert from `serde_as` to the serde traits.
+///
+/// The `As` type adapter allows using types which implement [`DeserializeAs`] or [`SerializeAs`] in place of serde's with-annotation.
+/// The with-annotation allows running custom code when de/serializing, however it is quite inflexible.
+/// The traits [`DeserializeAs`]/[`SerializeAs`] are more flexible, as they allow composition and nesting of types to create more complex de/serialization behavior.
+/// However, they are not directly compatible with serde, as they are not provided by serde.
+/// The `As` type adapter makes them compatible, by forwarding the function calls to `serialize`/`deserialize` to the corresponding functions `serialize_as` and `deserialize_as`.
+///
+/// It is not required to use this type directly.
+/// Instead, it is highly encouraged to use the [`#[serde_as]`][serde_as] attribute since it includes further usability improvements.
+/// If the use of the use of the proc-macro is not acceptable, then `As` can be used directly with serde.
+///
+/// ```rust
+/// # use serde::{Deserialize, Serialize};
+/// # use serde_with::{As, DisplayFromStr};
+/// #
+/// #[derive(Deserialize, Serialize)]
+/// # struct S {
+/// // Serialize numbers as sequence of strings, using Display and FromStr
+/// #[serde(with = "As::<Vec<DisplayFromStr>>")]
+/// field: Vec<u8>,
+/// # }
+/// ```
+/// If the normal `Deserialize`/`Serialize` traits should be used, the placeholder type [`Same`] can be used.
+/// It implements [`DeserializeAs`][]/[`SerializeAs`][], when the underlying type implements `Deserialize`/`Serialize`.
+///
+/// ```rust
+/// # use serde::{Deserialize, Serialize};
+/// # use serde_with::{As, DisplayFromStr, Same};
+/// # use std::collections::BTreeMap;
+/// #
+/// #[derive(Deserialize, Serialize)]
+/// # struct S {
+/// // Serialize map, turn keys into strings but keep type of value
+/// #[serde(with = "As::<BTreeMap<DisplayFromStr, Same>>")]
+/// field: BTreeMap<u8, i32>,
+/// # }
+/// ```
+///
+/// [serde_as]: https://docs.rs/serde_with/1.14.0/serde_with/attr.serde_as.html
+#[derive(Copy, Clone, Debug, Default)]
+pub struct As<T: ?Sized>(PhantomData<T>);
+
+impl<T: ?Sized> As<T> {
+    /// Serialize type `T` using [`SerializeAs`][]
+    ///
+    /// The function signature is compatible with [serde's with-annotation][with-annotation].
+    ///
+    /// [with-annotation]: https://serde.rs/field-attrs.html#with
+    pub fn serialize<S, I>(value: &I, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+        T: SerializeAs<I>,
+        I: ?Sized,
+    {
+        T::serialize_as(value, serializer)
+    }
+
+    /// Deserialize type `T` using [`DeserializeAs`][]
+    ///
+    /// The function signature is compatible with [serde's with-annotation][with-annotation].
+    ///
+    /// [with-annotation]: https://serde.rs/field-attrs.html#with
+    pub fn deserialize<'de, D, I>(deserializer: D) -> Result<I, D::Error>
+    where
+        T: DeserializeAs<'de, I>,
+        D: Deserializer<'de>,
+    {
+        T::deserialize_as(deserializer)
+    }
+}
+
+/// Adapter to convert from `serde_as` to the serde traits.
+///
+/// This is the counter-type to [`As`][].
+/// It can be used whenever a type implementing [`DeserializeAs`][]/[`SerializeAs`][] is required but the normal `Deserialize`/`Serialize` traits should be used.
+/// Check [`As`] for an example.
+#[derive(Copy, Clone, Debug, Default)]
+pub struct Same;
+
+/// De/Serialize using [`Display`] and [`FromStr`] implementation
+///
+/// This allows deserializing a string as a number.
+/// It can be very useful for serialization formats like JSON, which do not support integer
+/// numbers and have to resort to strings to represent them.
+///
+/// Another use case is types with [`Display`] and [`FromStr`] implementations, but without serde
+/// support, which can be found in some crates.
+///
+/// If you control the type you want to de/serialize, you can instead use the two derive macros, [`SerializeDisplay`] and [`DeserializeFromStr`].
+/// They properly implement the traits [`Serialize`] and [`Deserialize`] such that user of the type no longer have to use the `serde_as` system.
+///
+/// The same functionality is also available as [`serde_with::rust::display_fromstr`][crate::rust::display_fromstr] compatible with serde's with-annotation.
+///
+/// # Examples
+///
+/// ```rust
+/// # #[cfg(feature = "macros")] {
+/// # use serde::{Deserialize, Serialize};
+/// # use serde_json::json;
+/// # use serde_with::{serde_as, DisplayFromStr};
+/// #
+/// #[serde_as]
+/// #[derive(Deserialize, Serialize)]
+/// struct A {
+///     #[serde_as(as = "DisplayFromStr")]
+///     mime: mime::Mime,
+///     #[serde_as(as = "DisplayFromStr")]
+///     number: u32,
+/// }
+///
+/// let v: A = serde_json::from_value(json!({
+///     "mime": "text/plain",
+///     "number": "159",
+/// })).unwrap();
+/// assert_eq!(mime::TEXT_PLAIN, v.mime);
+/// assert_eq!(159, v.number);
+///
+/// let x = A {
+///     mime: mime::STAR_STAR,
+///     number: 777,
+/// };
+/// assert_eq!(json!({ "mime": "*/*", "number": "777" }), serde_json::to_value(&x).unwrap());
+/// # }
+/// ```
+///
+/// [`Display`]: std::fmt::Display
+/// [`FromStr`]: std::str::FromStr
+#[derive(Copy, Clone, Debug, Default)]
+pub struct DisplayFromStr;
+
+/// De/Serialize a [`Option<String>`] type while transforming the empty string to [`None`]
+///
+/// Convert an [`Option<T>`] from/to string using [`FromStr`] and [`AsRef<str>`] implementations.
+/// An empty string is deserialized as [`None`] and a [`None`] vice versa.
+///
+/// The same functionality is also available as [`serde_with::rust::string_empty_as_none`][crate::rust::string_empty_as_none] compatible with serde's with-annotation.
+///
+/// # Examples
+///
+/// ```
+/// # #[cfg(feature = "macros")] {
+/// # use serde::{Deserialize, Serialize};
+/// # use serde_json::json;
+/// # use serde_with::{serde_as, NoneAsEmptyString};
+/// #
+/// #[serde_as]
+/// #[derive(Deserialize, Serialize)]
+/// struct A {
+///     #[serde_as(as = "NoneAsEmptyString")]
+///     tags: Option<String>,
+/// }
+///
+/// let v: A = serde_json::from_value(json!({ "tags": "" })).unwrap();
+/// assert_eq!(None, v.tags);
+///
+/// let v: A = serde_json::from_value(json!({ "tags": "Hi" })).unwrap();
+/// assert_eq!(Some("Hi".to_string()), v.tags);
+///
+/// let x = A {
+///     tags: Some("This is text".to_string()),
+/// };
+/// assert_eq!(json!({ "tags": "This is text" }), serde_json::to_value(&x).unwrap());
+///
+/// let x = A {
+///     tags: None,
+/// };
+/// assert_eq!(json!({ "tags": "" }), serde_json::to_value(&x).unwrap());
+/// # }
+/// ```
+///
+/// [`FromStr`]: std::str::FromStr
+#[derive(Copy, Clone, Debug, Default)]
+pub struct NoneAsEmptyString;
+
+/// Deserialize value and return [`Default`] on error
+///
+/// The main use case is ignoring error while deserializing.
+/// Instead of erroring, it simply deserializes the [`Default`] variant of the type.
+/// It is not possible to find the error location, i.e., which field had a deserialization error, with this method.
+/// During serialization this wrapper does nothing.
+/// The serialization behavior of the underlying type is preserved.
+/// The type must implement [`Default`] for this conversion to work.
+///
+/// The same functionality is also available as [`serde_with::rust::default_on_error`][crate::rust::default_on_error] compatible with serde's with-annotation.
+///
+/// # Examples
+///
+/// ```
+/// # #[cfg(feature = "macros")] {
+/// # use serde::Deserialize;
+/// # use serde_with::{serde_as, DefaultOnError};
+/// #
+/// #[serde_as]
+/// #[derive(Deserialize, Debug)]
+/// struct A {
+///     #[serde_as(deserialize_as = "DefaultOnError")]
+///     value: u32,
+/// }
+///
+/// let a: A = serde_json::from_str(r#"{"value": 123}"#).unwrap();
+/// assert_eq!(123, a.value);
+///
+/// // null is of invalid type
+/// let a: A = serde_json::from_str(r#"{"value": null}"#).unwrap();
+/// assert_eq!(0, a.value);
+///
+/// // String is of invalid type
+/// let a: A = serde_json::from_str(r#"{"value": "123"}"#).unwrap();
+/// assert_eq!(0, a.value);
+///
+/// // Map is of invalid type
+/// let a: A = dbg!(serde_json::from_str(r#"{"value": {}}"#)).unwrap();
+/// assert_eq!(0, a.value);
+///
+/// // Missing entries still cause errors
+/// assert!(serde_json::from_str::<A>(r#"{  }"#).is_err());
+/// # }
+/// ```
+///
+/// Deserializing missing values can be supported by adding the `default` field attribute:
+///
+/// ```
+/// # #[cfg(feature = "macros")] {
+/// # use serde::Deserialize;
+/// # use serde_with::{serde_as, DefaultOnError};
+/// #
+/// #[serde_as]
+/// #[derive(Deserialize)]
+/// struct B {
+///     #[serde_as(deserialize_as = "DefaultOnError")]
+///     #[serde(default)]
+///     value: u32,
+/// }
+///
+/// let b: B = serde_json::from_str(r#"{  }"#).unwrap();
+/// assert_eq!(0, b.value);
+/// # }
+/// ```
+///
+/// `DefaultOnError` can be combined with other conversion methods.
+/// In this example, we deserialize a `Vec`, each element is deserialized from a string.
+/// If the string does not parse as a number, then we get the default value of 0.
+///
+/// ```rust
+/// # #[cfg(feature = "macros")] {
+/// # use serde::{Deserialize, Serialize};
+/// # use serde_json::json;
+/// # use serde_with::{serde_as, DefaultOnError, DisplayFromStr};
+/// #
+/// #[serde_as]
+/// #[derive(Serialize, Deserialize)]
+/// struct C {
+///     #[serde_as(as = "Vec<DefaultOnError<DisplayFromStr>>")]
+///     value: Vec<u32>,
+/// };
+///
+/// let c: C = serde_json::from_value(json!({
+///     "value": ["1", "2", "a3", "", {}, "6"]
+/// })).unwrap();
+/// assert_eq!(vec![1, 2, 0, 0, 0, 6], c.value);
+/// # }
+/// ```
+#[derive(Copy, Clone, Debug, Default)]
+pub struct DefaultOnError<T = Same>(PhantomData<T>);
+
+/// Deserialize [`Default`] from `null` values
+///
+/// Instead of erroring on `null` values, it simply deserializes the [`Default`] variant of the type.
+/// During serialization this wrapper does nothing.
+/// The serialization behavior of the underlying type is preserved.
+/// The type must implement [`Default`] for this conversion to work.
+///
+/// The same functionality is also available as [`serde_with::rust::default_on_null`][crate::rust::default_on_null] compatible with serde's with-annotation.
+///
+/// # Examples
+///
+/// ```
+/// # #[cfg(feature = "macros")] {
+/// # use serde::Deserialize;
+/// # use serde_with::{serde_as, DefaultOnNull};
+/// #
+/// #[serde_as]
+/// #[derive(Deserialize, Debug)]
+/// struct A {
+///     #[serde_as(deserialize_as = "DefaultOnNull")]
+///     value: u32,
+/// }
+///
+/// let a: A = serde_json::from_str(r#"{"value": 123}"#).unwrap();
+/// assert_eq!(123, a.value);
+///
+/// // null values are deserialized into the default, here 0
+/// let a: A = serde_json::from_str(r#"{"value": null}"#).unwrap();
+/// assert_eq!(0, a.value);
+/// # }
+/// ```
+///
+/// `DefaultOnNull` can be combined with other conversion methods.
+/// In this example, we deserialize a `Vec`, each element is deserialized from a string.
+/// If we encounter null, then we get the default value of 0.
+///
+/// ```rust
+/// # #[cfg(feature = "macros")] {
+/// # use serde::{Deserialize, Serialize};
+/// # use serde_json::json;
+/// # use serde_with::{serde_as, DefaultOnNull, DisplayFromStr};
+/// #
+/// #[serde_as]
+/// #[derive(Serialize, Deserialize)]
+/// struct C {
+///     #[serde_as(as = "Vec<DefaultOnNull<DisplayFromStr>>")]
+///     value: Vec<u32>,
+/// };
+///
+/// let c: C = serde_json::from_value(json!({
+///     "value": ["1", "2", null, null, "5"]
+/// })).unwrap();
+/// assert_eq!(vec![1, 2, 0, 0, 5], c.value);
+/// # }
+/// ```
+#[derive(Copy, Clone, Debug, Default)]
+pub struct DefaultOnNull<T = Same>(PhantomData<T>);
+
+/// Deserialize from bytes or string
+///
+/// Any Rust [`String`] can be converted into bytes, i.e., `Vec<u8>`.
+/// Accepting both as formats while deserializing can be helpful while interacting with language
+/// which have a looser definition of string than Rust.
+///
+/// # Example
+/// ```rust
+/// # #[cfg(feature = "macros")] {
+/// # use serde::{Deserialize, Serialize};
+/// # use serde_json::json;
+/// # use serde_with::{serde_as, BytesOrString};
+/// #
+/// #[serde_as]
+/// #[derive(Deserialize, Serialize)]
+/// struct A {
+///     #[serde_as(as = "BytesOrString")]
+///     bytes_or_string: Vec<u8>,
+/// }
+///
+/// // Here we deserialize from a byte array ...
+/// let j = json!({
+///   "bytes_or_string": [
+///     0,
+///     1,
+///     2,
+///     3
+///   ]
+/// });
+///
+/// let a: A = serde_json::from_value(j.clone()).unwrap();
+/// assert_eq!(vec![0, 1, 2, 3], a.bytes_or_string);
+///
+/// // and serialization works too.
+/// assert_eq!(j, serde_json::to_value(&a).unwrap());
+///
+/// // But we also support deserializing from a String
+/// let j = json!({
+///   "bytes_or_string": "✨Works!"
+/// });
+///
+/// let a: A = serde_json::from_value(j).unwrap();
+/// assert_eq!("✨Works!".as_bytes(), &*a.bytes_or_string);
+/// # }
+/// ```
+/// [`String`]: std::string::String
+#[derive(Copy, Clone, Debug, Default)]
+pub struct BytesOrString;
+
+/// De/Serialize Durations as number of seconds.
+///
+/// De/serialize durations as number of seconds with subsecond precision.
+/// Subsecond precision is *only* supported for [`DurationSecondsWithFrac`], but not for [`DurationSeconds`].
+/// You can configure the serialization format between integers, floats, and stringified numbers with the `FORMAT` specifier and configure the deserialization with the `STRICTNESS` specifier.
+///
+/// The `STRICTNESS` specifier can either be [`formats::Strict`] or [`formats::Flexible`] and defaults to [`formats::Strict`].
+/// [`formats::Strict`] means that deserialization only supports the type given in `FORMAT`, e.g., if `FORMAT` is `u64` deserialization from a `f64` will error.
+/// [`formats::Flexible`] means that deserialization will perform a best effort to extract the correct duration and allows deserialization from any type.
+/// For example, deserializing `DurationSeconds<f64, Flexible>` will discard any subsecond precision during deserialization from `f64` and will parse a `String` as an integer number.
+///
+/// This type also supports [`chrono::Duration`] with the `chrono`-[feature flag].
+/// This type also supports [`time::Duration`][::time_0_3::Duration] with the `time_0_3`-[feature flag].
+///
+/// | Duration Type         | Converter                 | Available `FORMAT`s    |
+/// | --------------------- | ------------------------- | ---------------------- |
+/// | `std::time::Duration` | `DurationSeconds`         | `u64`, `f64`, `String` |
+/// | `std::time::Duration` | `DurationSecondsWithFrac` | `f64`, `String`        |
+/// | `chrono::Duration`    | `DurationSeconds`         | `i64`, `f64`, `String` |
+/// | `chrono::Duration`    | `DurationSecondsWithFrac` | `f64`, `String`        |
+/// | `time::Duration`      | `DurationSeconds`         | `i64`, `f64`, `String` |
+/// | `time::Duration`      | `DurationSecondsWithFrac` | `f64`, `String`        |
+///
+/// # Examples
+///
+/// ```rust
+/// # #[cfg(feature = "macros")] {
+/// # use serde::{Deserialize, Serialize};
+/// # use serde_json::json;
+/// # use serde_with::{serde_as, DurationSeconds};
+/// use std::time::Duration;
+///
+/// #[serde_as]
+/// # #[derive(Debug, PartialEq)]
+/// #[derive(Deserialize, Serialize)]
+/// struct Durations {
+///     #[serde_as(as = "DurationSeconds<u64>")]
+///     d_u64: Duration,
+///     #[serde_as(as = "DurationSeconds<f64>")]
+///     d_f64: Duration,
+///     #[serde_as(as = "DurationSeconds<String>")]
+///     d_string: Duration,
+/// };
+///
+/// // Serialization
+/// // See how the values get rounded, since subsecond precision is not allowed.
+///
+/// let d = Durations {
+///     d_u64: Duration::new(12345, 0), // Create from seconds and nanoseconds
+///     d_f64: Duration::new(12345, 500_000_000),
+///     d_string: Duration::new(12345, 999_999_999),
+/// };
+/// // Observe the different data types
+/// let expected = json!({
+///     "d_u64": 12345,
+///     "d_f64": 12346.0,
+///     "d_string": "12346",
+/// });
+/// assert_eq!(expected, serde_json::to_value(&d).unwrap());
+///
+/// // Deserialization works too
+/// // Subsecond precision in numbers will be rounded away
+///
+/// let json = json!({
+///     "d_u64": 12345,
+///     "d_f64": 12345.5,
+///     "d_string": "12346",
+/// });
+/// let expected = Durations {
+///     d_u64: Duration::new(12345, 0), // Create from seconds and nanoseconds
+///     d_f64: Duration::new(12346, 0),
+///     d_string: Duration::new(12346, 0),
+/// };
+/// assert_eq!(expected, serde_json::from_value(json).unwrap());
+/// # }
+/// ```
+///
+/// [`chrono::Duration`] is also supported when using the `chrono` feature.
+/// It is a signed duration, thus can be de/serialized as an `i64` instead of a `u64`.
+///
+/// ```rust
+/// # #[cfg(all(feature = "macros", feature = "chrono"))] {
+/// # use serde::{Deserialize, Serialize};
+/// # use serde_json::json;
+/// # use serde_with::{serde_as, DurationSeconds};
+/// # use chrono_crate::Duration;
+/// # /* Ugliness to make the docs look nicer since I want to hide the rename of the chrono crate
+/// use chrono::Duration;
+/// # */
+///
+/// #[serde_as]
+/// # #[derive(Debug, PartialEq)]
+/// #[derive(Deserialize, Serialize)]
+/// struct Durations {
+///     #[serde_as(as = "DurationSeconds<i64>")]
+///     d_i64: Duration,
+///     #[serde_as(as = "DurationSeconds<f64>")]
+///     d_f64: Duration,
+///     #[serde_as(as = "DurationSeconds<String>")]
+///     d_string: Duration,
+/// };
+///
+/// // Serialization
+/// // See how the values get rounded, since subsecond precision is not allowed.
+///
+/// let d = Durations {
+///     d_i64: Duration::seconds(-12345),
+///     d_f64: Duration::seconds(-12345) + Duration::milliseconds(500),
+///     d_string: Duration::seconds(12345) + Duration::nanoseconds(999_999_999),
+/// };
+/// // Observe the different data types
+/// let expected = json!({
+///     "d_i64": -12345,
+///     "d_f64": -12345.0,
+///     "d_string": "12346",
+/// });
+/// assert_eq!(expected, serde_json::to_value(&d).unwrap());
+///
+/// // Deserialization works too
+/// // Subsecond precision in numbers will be rounded away
+///
+/// let json = json!({
+///     "d_i64": -12345,
+///     "d_f64": -12345.5,
+///     "d_string": "12346",
+/// });
+/// let expected = Durations {
+///     d_i64: Duration::seconds(-12345),
+///     d_f64: Duration::seconds(-12346),
+///     d_string: Duration::seconds(12346),
+/// };
+/// assert_eq!(expected, serde_json::from_value(json).unwrap());
+/// # }
+/// ```
+///
+/// [`chrono::Duration`]: chrono_crate::Duration
+/// [feature flag]: https://docs.rs/serde_with/1.14.0/serde_with/guide/feature_flags/index.html
+#[derive(Copy, Clone, Debug, Default)]
+pub struct DurationSeconds<
+    FORMAT: formats::Format = u64,
+    STRICTNESS: formats::Strictness = formats::Strict,
+>(PhantomData<(FORMAT, STRICTNESS)>);
+
+/// De/Serialize Durations as number of seconds.
+///
+/// De/serialize durations as number of seconds with subsecond precision.
+/// Subsecond precision is *only* supported for [`DurationSecondsWithFrac`], but not for [`DurationSeconds`].
+/// You can configure the serialization format between integers, floats, and stringified numbers with the `FORMAT` specifier and configure the deserialization with the `STRICTNESS` specifier.
+///
+/// The `STRICTNESS` specifier can either be [`formats::Strict`] or [`formats::Flexible`] and defaults to [`formats::Strict`].
+/// [`formats::Strict`] means that deserialization only supports the type given in `FORMAT`, e.g., if `FORMAT` is `u64` deserialization from a `f64` will error.
+/// [`formats::Flexible`] means that deserialization will perform a best effort to extract the correct duration and allows deserialization from any type.
+/// For example, deserializing `DurationSeconds<f64, Flexible>` will discard any subsecond precision during deserialization from `f64` and will parse a `String` as an integer number.
+///
+/// This type also supports [`chrono::Duration`] with the `chrono`-[feature flag].
+/// This type also supports [`time::Duration`][::time_0_3::Duration] with the `time_0_3`-[feature flag].
+///
+/// | Duration Type         | Converter                 | Available `FORMAT`s    |
+/// | --------------------- | ------------------------- | ---------------------- |
+/// | `std::time::Duration` | `DurationSeconds`         | `u64`, `f64`, `String` |
+/// | `std::time::Duration` | `DurationSecondsWithFrac` | `f64`, `String`        |
+/// | `chrono::Duration`    | `DurationSeconds`         | `i64`, `f64`, `String` |
+/// | `chrono::Duration`    | `DurationSecondsWithFrac` | `f64`, `String`        |
+/// | `time::Duration`      | `DurationSeconds`         | `i64`, `f64`, `String` |
+/// | `time::Duration`      | `DurationSecondsWithFrac` | `f64`, `String`        |
+///
+/// # Examples
+///
+/// ```rust
+/// # #[cfg(feature = "macros")] {
+/// # use serde::{Deserialize, Serialize};
+/// # use serde_json::json;
+/// # use serde_with::{serde_as, DurationSecondsWithFrac};
+/// use std::time::Duration;
+///
+/// #[serde_as]
+/// # #[derive(Debug, PartialEq)]
+/// #[derive(Deserialize, Serialize)]
+/// struct Durations {
+///     #[serde_as(as = "DurationSecondsWithFrac<f64>")]
+///     d_f64: Duration,
+///     #[serde_as(as = "DurationSecondsWithFrac<String>")]
+///     d_string: Duration,
+/// };
+///
+/// // Serialization
+/// // See how the values get rounded, since subsecond precision is not allowed.
+///
+/// let d = Durations {
+///     d_f64: Duration::new(12345, 500_000_000), // Create from seconds and nanoseconds
+///     d_string: Duration::new(12345, 999_999_000),
+/// };
+/// // Observe the different data types
+/// let expected = json!({
+///     "d_f64": 12345.5,
+///     "d_string": "12345.999999",
+/// });
+/// assert_eq!(expected, serde_json::to_value(&d).unwrap());
+///
+/// // Deserialization works too
+/// // Subsecond precision in numbers will be rounded away
+///
+/// let json = json!({
+///     "d_f64": 12345.5,
+///     "d_string": "12345.987654",
+/// });
+/// let expected = Durations {
+///     d_f64: Duration::new(12345, 500_000_000), // Create from seconds and nanoseconds
+///     d_string: Duration::new(12345, 987_654_000),
+/// };
+/// assert_eq!(expected, serde_json::from_value(json).unwrap());
+/// # }
+/// ```
+///
+/// [`chrono::Duration`] is also supported when using the `chrono` feature.
+/// It is a signed duration, thus can be de/serialized as an `i64` instead of a `u64`.
+///
+/// ```rust
+/// # #[cfg(all(feature = "macros", feature = "chrono"))] {
+/// # use serde::{Deserialize, Serialize};
+/// # use serde_json::json;
+/// # use serde_with::{serde_as, DurationSecondsWithFrac};
+/// # use chrono_crate::Duration;
+/// # /* Ugliness to make the docs look nicer since I want to hide the rename of the chrono crate
+/// use chrono::Duration;
+/// # */
+///
+/// #[serde_as]
+/// # #[derive(Debug, PartialEq)]
+/// #[derive(Deserialize, Serialize)]
+/// struct Durations {
+///     #[serde_as(as = "DurationSecondsWithFrac<f64>")]
+///     d_f64: Duration,
+///     #[serde_as(as = "DurationSecondsWithFrac<String>")]
+///     d_string: Duration,
+/// };
+///
+/// // Serialization
+///
+/// let d = Durations {
+///     d_f64: Duration::seconds(-12345) + Duration::milliseconds(500),
+///     d_string: Duration::seconds(12345) + Duration::nanoseconds(999_999_000),
+/// };
+/// // Observe the different data types
+/// let expected = json!({
+///     "d_f64": -12344.5,
+///     "d_string": "12345.999999",
+/// });
+/// assert_eq!(expected, serde_json::to_value(&d).unwrap());
+///
+/// // Deserialization works too
+///
+/// let json = json!({
+///     "d_f64": -12344.5,
+///     "d_string": "12345.987",
+/// });
+/// let expected = Durations {
+///     d_f64: Duration::seconds(-12345) + Duration::milliseconds(500),
+///     d_string: Duration::seconds(12345) + Duration::milliseconds(987),
+/// };
+/// assert_eq!(expected, serde_json::from_value(json).unwrap());
+/// # }
+/// ```
+///
+/// [`chrono::Duration`]: chrono_crate::Duration
+/// [feature flag]: https://docs.rs/serde_with/1.14.0/serde_with/guide/feature_flags/index.html
+#[derive(Copy, Clone, Debug, Default)]
+pub struct DurationSecondsWithFrac<
+    FORMAT: formats::Format = f64,
+    STRICTNESS: formats::Strictness = formats::Strict,
+>(PhantomData<(FORMAT, STRICTNESS)>);
+
+/// Equivalent to [`DurationSeconds`] with milli-seconds as base unit.
+///
+/// This type is equivalent to [`DurationSeconds`] except that each unit represents 1 milli-second instead of 1 second for [`DurationSeconds`].
+#[derive(Copy, Clone, Debug, Default)]
+pub struct DurationMilliSeconds<
+    FORMAT: formats::Format = u64,
+    STRICTNESS: formats::Strictness = formats::Strict,
+>(PhantomData<(FORMAT, STRICTNESS)>);
+
+/// Equivalent to [`DurationSecondsWithFrac`] with milli-seconds as base unit.
+///
+/// This type is equivalent to [`DurationSecondsWithFrac`] except that each unit represents 1 milli-second instead of 1 second for [`DurationSecondsWithFrac`].
+#[derive(Copy, Clone, Debug, Default)]
+pub struct DurationMilliSecondsWithFrac<
+    FORMAT: formats::Format = f64,
+    STRICTNESS: formats::Strictness = formats::Strict,
+>(PhantomData<(FORMAT, STRICTNESS)>);
+
+/// Equivalent to [`DurationSeconds`] with micro-seconds as base unit.
+///
+/// This type is equivalent to [`DurationSeconds`] except that each unit represents 1 micro-second instead of 1 second for [`DurationSeconds`].
+#[derive(Copy, Clone, Debug, Default)]
+pub struct DurationMicroSeconds<
+    FORMAT: formats::Format = u64,
+    STRICTNESS: formats::Strictness = formats::Strict,
+>(PhantomData<(FORMAT, STRICTNESS)>);
+
+/// Equivalent to [`DurationSecondsWithFrac`] with micro-seconds as base unit.
+///
+/// This type is equivalent to [`DurationSecondsWithFrac`] except that each unit represents 1 micro-second instead of 1 second for [`DurationSecondsWithFrac`].
+#[derive(Copy, Clone, Debug, Default)]
+pub struct DurationMicroSecondsWithFrac<
+    FORMAT: formats::Format = f64,
+    STRICTNESS: formats::Strictness = formats::Strict,
+>(PhantomData<(FORMAT, STRICTNESS)>);
+
+/// Equivalent to [`DurationSeconds`] with nano-seconds as base unit.
+///
+/// This type is equivalent to [`DurationSeconds`] except that each unit represents 1 nano-second instead of 1 second for [`DurationSeconds`].
+#[derive(Copy, Clone, Debug, Default)]
+pub struct DurationNanoSeconds<
+    FORMAT: formats::Format = u64,
+    STRICTNESS: formats::Strictness = formats::Strict,
+>(PhantomData<(FORMAT, STRICTNESS)>);
+
+/// Equivalent to [`DurationSecondsWithFrac`] with nano-seconds as base unit.
+///
+/// This type is equivalent to [`DurationSecondsWithFrac`] except that each unit represents 1 nano-second instead of 1 second for [`DurationSecondsWithFrac`].
+#[derive(Copy, Clone, Debug, Default)]
+pub struct DurationNanoSecondsWithFrac<
+    FORMAT: formats::Format = f64,
+    STRICTNESS: formats::Strictness = formats::Strict,
+>(PhantomData<(FORMAT, STRICTNESS)>);
+
+/// De/Serialize timestamps as seconds since the UNIX epoch
+///
+/// De/serialize timestamps as seconds since the UNIX epoch.
+/// Subsecond precision is *only* supported for [`TimestampSecondsWithFrac`], but not for [`TimestampSeconds`].
+/// You can configure the serialization format between integers, floats, and stringified numbers with the `FORMAT` specifier and configure the deserialization with the `STRICTNESS` specifier.
+///
+/// The `STRICTNESS` specifier can either be [`formats::Strict`] or [`formats::Flexible`] and defaults to [`formats::Strict`].
+/// [`formats::Strict`] means that deserialization only supports the type given in `FORMAT`, e.g., if `FORMAT` is `i64` deserialization from a `f64` will error.
+/// [`formats::Flexible`] means that deserialization will perform a best effort to extract the correct timestamp and allows deserialization from any type.
+/// For example, deserializing `TimestampSeconds<f64, Flexible>` will discard any subsecond precision during deserialization from `f64` and will parse a `String` as an integer number.
+///
+/// This type also supports [`chrono::DateTime`][DateTime] with the `chrono`-[feature flag].
+/// This type also supports [`time::OffsetDateTime`][::time_0_3::OffsetDateTime] and [`time::PrimitiveDateTime`][::time_0_3::PrimitiveDateTime] with the `time_0_3`-[feature flag].
+///
+/// | Timestamp Type            | Converter                  | Available `FORMAT`s    |
+/// | ------------------------- | -------------------------- | ---------------------- |
+/// | `std::time::SystemTime`   | `TimestampSeconds`         | `i64`, `f64`, `String` |
+/// | `std::time::SystemTime`   | `TimestampSecondsWithFrac` | `f64`, `String`        |
+/// | `chrono::DateTime<Utc>`   | `TimestampSeconds`         | `i64`, `f64`, `String` |
+/// | `chrono::DateTime<Utc>`   | `TimestampSecondsWithFrac` | `f64`, `String`        |
+/// | `chrono::DateTime<Local>` | `TimestampSeconds`         | `i64`, `f64`, `String` |
+/// | `chrono::DateTime<Local>` | `TimestampSecondsWithFrac` | `f64`, `String`        |
+/// | `time::OffsetDateTime`    | `TimestampSeconds`         | `i64`, `f64`, `String` |
+/// | `time::OffsetDateTime`    | `TimestampSecondsWithFrac` | `f64`, `String`        |
+/// | `time::PrimitiveDateTime` | `TimestampSeconds`         | `i64`, `f64`, `String` |
+/// | `time::PrimitiveDateTime` | `TimestampSecondsWithFrac` | `f64`, `String`        |
+///
+/// # Examples
+///
+/// ```rust
+/// # #[cfg(feature = "macros")] {
+/// # use serde::{Deserialize, Serialize};
+/// # use serde_json::json;
+/// # use serde_with::{serde_as, TimestampSeconds};
+/// use std::time::{Duration, SystemTime};
+///
+/// #[serde_as]
+/// # #[derive(Debug, PartialEq)]
+/// #[derive(Deserialize, Serialize)]
+/// struct Timestamps {
+///     #[serde_as(as = "TimestampSeconds<i64>")]
+///     st_i64: SystemTime,
+///     #[serde_as(as = "TimestampSeconds<f64>")]
+///     st_f64: SystemTime,
+///     #[serde_as(as = "TimestampSeconds<String>")]
+///     st_string: SystemTime,
+/// };
+///
+/// // Serialization
+/// // See how the values get rounded, since subsecond precision is not allowed.
+///
+/// let ts = Timestamps {
+///     st_i64: SystemTime::UNIX_EPOCH.checked_add(Duration::new(12345, 0)).unwrap(),
+///     st_f64: SystemTime::UNIX_EPOCH.checked_add(Duration::new(12345, 500_000_000)).unwrap(),
+///     st_string: SystemTime::UNIX_EPOCH.checked_add(Duration::new(12345, 999_999_999)).unwrap(),
+/// };
+/// // Observe the different data types
+/// let expected = json!({
+///     "st_i64": 12345,
+///     "st_f64": 12346.0,
+///     "st_string": "12346",
+/// });
+/// assert_eq!(expected, serde_json::to_value(&ts).unwrap());
+///
+/// // Deserialization works too
+/// // Subsecond precision in numbers will be rounded away
+///
+/// let json = json!({
+///     "st_i64": 12345,
+///     "st_f64": 12345.5,
+///     "st_string": "12346",
+/// });
+/// let expected  = Timestamps {
+///     st_i64: SystemTime::UNIX_EPOCH.checked_add(Duration::new(12345, 0)).unwrap(),
+///     st_f64: SystemTime::UNIX_EPOCH.checked_add(Duration::new(12346, 0)).unwrap(),
+///     st_string: SystemTime::UNIX_EPOCH.checked_add(Duration::new(12346, 0)).unwrap(),
+/// };
+/// assert_eq!(expected, serde_json::from_value(json).unwrap());
+/// # }
+/// ```
+///
+/// [`chrono::DateTime<Utc>`][DateTime] and [`chrono::DateTime<Local>`][DateTime] are also supported when using the `chrono` feature.
+/// Like [`SystemTime`], it is a signed timestamp, thus can be de/serialized as an `i64`.
+///
+/// ```rust
+/// # #[cfg(all(feature = "macros", feature = "chrono"))] {
+/// # use serde::{Deserialize, Serialize};
+/// # use serde_json::json;
+/// # use serde_with::{serde_as, TimestampSeconds};
+/// # use chrono_crate::{DateTime, Local, TimeZone, Utc};
+/// # /* Ugliness to make the docs look nicer since I want to hide the rename of the chrono crate
+/// use chrono::{DateTime, Local, TimeZone, Utc};
+/// # */
+///
+/// #[serde_as]
+/// # #[derive(Debug, PartialEq)]
+/// #[derive(Deserialize, Serialize)]
+/// struct Timestamps {
+///     #[serde_as(as = "TimestampSeconds<i64>")]
+///     dt_i64: DateTime<Utc>,
+///     #[serde_as(as = "TimestampSeconds<f64>")]
+///     dt_f64: DateTime<Local>,
+///     #[serde_as(as = "TimestampSeconds<String>")]
+///     dt_string: DateTime<Utc>,
+/// };
+///
+/// // Serialization
+/// // See how the values get rounded, since subsecond precision is not allowed.
+///
+/// let ts = Timestamps {
+///     dt_i64: Utc.timestamp(-12345, 0),
+///     dt_f64: Local.timestamp(-12345, 500_000_000),
+///     dt_string: Utc.timestamp(12345, 999_999_999),
+/// };
+/// // Observe the different data types
+/// let expected = json!({
+///     "dt_i64": -12345,
+///     "dt_f64": -12345.0,
+///     "dt_string": "12346",
+/// });
+/// assert_eq!(expected, serde_json::to_value(&ts).unwrap());
+///
+/// // Deserialization works too
+/// // Subsecond precision in numbers will be rounded away
+///
+/// let json = json!({
+///     "dt_i64": -12345,
+///     "dt_f64": -12345.5,
+///     "dt_string": "12346",
+/// });
+/// let expected = Timestamps {
+///     dt_i64: Utc.timestamp(-12345, 0),
+///     dt_f64: Local.timestamp(-12346, 0),
+///     dt_string: Utc.timestamp(12346, 0),
+/// };
+/// assert_eq!(expected, serde_json::from_value(json).unwrap());
+/// # }
+/// ```
+///
+/// [`SystemTime`]: std::time::SystemTime
+/// [DateTime]: chrono_crate::DateTime
+/// [feature flag]: https://docs.rs/serde_with/1.14.0/serde_with/guide/feature_flags/index.html
+#[derive(Copy, Clone, Debug, Default)]
+pub struct TimestampSeconds<
+    FORMAT: formats::Format = i64,
+    STRICTNESS: formats::Strictness = formats::Strict,
+>(PhantomData<(FORMAT, STRICTNESS)>);
+
+/// De/Serialize timestamps as seconds since the UNIX epoch
+///
+/// De/serialize timestamps as seconds since the UNIX epoch.
+/// Subsecond precision is *only* supported for [`TimestampSecondsWithFrac`], but not for [`TimestampSeconds`].
+/// You can configure the serialization format between integers, floats, and stringified numbers with the `FORMAT` specifier and configure the deserialization with the `STRICTNESS` specifier.
+///
+/// The `STRICTNESS` specifier can either be [`formats::Strict`] or [`formats::Flexible`] and defaults to [`formats::Strict`].
+/// [`formats::Strict`] means that deserialization only supports the type given in `FORMAT`, e.g., if `FORMAT` is `i64` deserialization from a `f64` will error.
+/// [`formats::Flexible`] means that deserialization will perform a best effort to extract the correct timestamp and allows deserialization from any type.
+/// For example, deserializing `TimestampSeconds<f64, Flexible>` will discard any subsecond precision during deserialization from `f64` and will parse a `String` as an integer number.
+///
+/// This type also supports [`chrono::DateTime`][DateTime] and [`chrono::NaiveDateTime`][NaiveDateTime] with the `chrono`-[feature flag].
+/// This type also supports [`time::OffsetDateTime`][::time_0_3::OffsetDateTime] and [`time::PrimitiveDateTime`][::time_0_3::PrimitiveDateTime] with the `time_0_3`-[feature flag].
+///
+/// | Timestamp Type            | Converter                  | Available `FORMAT`s    |
+/// | ------------------------- | -------------------------- | ---------------------- |
+/// | `std::time::SystemTime`   | `TimestampSeconds`         | `i64`, `f64`, `String` |
+/// | `std::time::SystemTime`   | `TimestampSecondsWithFrac` | `f64`, `String`        |
+/// | `chrono::DateTime<Utc>`   | `TimestampSeconds`         | `i64`, `f64`, `String` |
+/// | `chrono::DateTime<Utc>`   | `TimestampSecondsWithFrac` | `f64`, `String`        |
+/// | `chrono::DateTime<Local>` | `TimestampSeconds`         | `i64`, `f64`, `String` |
+/// | `chrono::DateTime<Local>` | `TimestampSecondsWithFrac` | `f64`, `String`        |
+/// | `chrono::NaiveDateTime`   | `TimestampSeconds`         | `i64`, `f64`, `String` |
+/// | `chrono::NaiveDateTime`   | `TimestampSecondsWithFrac` | `f64`, `String`        |
+/// | `time::OffsetDateTime`    | `TimestampSeconds`         | `i64`, `f64`, `String` |
+/// | `time::OffsetDateTime`    | `TimestampSecondsWithFrac` | `f64`, `String`        |
+/// | `time::PrimitiveDateTime` | `TimestampSeconds`         | `i64`, `f64`, `String` |
+/// | `time::PrimitiveDateTime` | `TimestampSecondsWithFrac` | `f64`, `String`        |
+///
+/// # Examples
+///
+/// ```rust
+/// # #[cfg(feature = "macros")] {
+/// # use serde::{Deserialize, Serialize};
+/// # use serde_json::json;
+/// # use serde_with::{serde_as, TimestampSecondsWithFrac};
+/// use std::time::{Duration, SystemTime};
+///
+/// #[serde_as]
+/// # #[derive(Debug, PartialEq)]
+/// #[derive(Deserialize, Serialize)]
+/// struct Timestamps {
+///     #[serde_as(as = "TimestampSecondsWithFrac<f64>")]
+///     st_f64: SystemTime,
+///     #[serde_as(as = "TimestampSecondsWithFrac<String>")]
+///     st_string: SystemTime,
+/// };
+///
+/// // Serialization
+/// // See how the values get rounded, since subsecond precision is not allowed.
+///
+/// let ts = Timestamps {
+///     st_f64: SystemTime::UNIX_EPOCH.checked_add(Duration::new(12345, 500_000_000)).unwrap(),
+///     st_string: SystemTime::UNIX_EPOCH.checked_add(Duration::new(12345, 999_999_000)).unwrap(),
+/// };
+/// // Observe the different data types
+/// let expected = json!({
+///     "st_f64": 12345.5,
+///     "st_string": "12345.999999",
+/// });
+/// assert_eq!(expected, serde_json::to_value(&ts).unwrap());
+///
+/// // Deserialization works too
+/// // Subsecond precision in numbers will be rounded away
+///
+/// let json = json!({
+///     "st_f64": 12345.5,
+///     "st_string": "12345.987654",
+/// });
+/// let expected = Timestamps {
+///     st_f64: SystemTime::UNIX_EPOCH.checked_add(Duration::new(12345, 500_000_000)).unwrap(),
+///     st_string: SystemTime::UNIX_EPOCH.checked_add(Duration::new(12345, 987_654_000)).unwrap(),
+/// };
+/// assert_eq!(expected, serde_json::from_value(json).unwrap());
+/// # }
+/// ```
+///
+/// [`chrono::DateTime<Utc>`][DateTime] and [`chrono::DateTime<Local>`][DateTime] are also supported when using the `chrono` feature.
+/// Like [`SystemTime`], it is a signed timestamp, thus can be de/serialized as an `i64`.
+///
+/// ```rust
+/// # #[cfg(all(feature = "macros", feature = "chrono"))] {
+/// # use serde::{Deserialize, Serialize};
+/// # use serde_json::json;
+/// # use serde_with::{serde_as, TimestampSecondsWithFrac};
+/// # use chrono_crate::{DateTime, Local, TimeZone, Utc};
+/// # /* Ugliness to make the docs look nicer since I want to hide the rename of the chrono crate
+/// use chrono::{DateTime, Local, TimeZone, Utc};
+/// # */
+///
+/// #[serde_as]
+/// # #[derive(Debug, PartialEq)]
+/// #[derive(Deserialize, Serialize)]
+/// struct Timestamps {
+///     #[serde_as(as = "TimestampSecondsWithFrac<f64>")]
+///     dt_f64: DateTime<Utc>,
+///     #[serde_as(as = "TimestampSecondsWithFrac<String>")]
+///     dt_string: DateTime<Local>,
+/// };
+///
+/// // Serialization
+///
+/// let ts = Timestamps {
+///     dt_f64: Utc.timestamp(-12345, 500_000_000),
+///     dt_string: Local.timestamp(12345, 999_999_000),
+/// };
+/// // Observe the different data types
+/// let expected = json!({
+///     "dt_f64": -12344.5,
+///     "dt_string": "12345.999999",
+/// });
+/// assert_eq!(expected, serde_json::to_value(&ts).unwrap());
+///
+/// // Deserialization works too
+///
+/// let json = json!({
+///     "dt_f64": -12344.5,
+///     "dt_string": "12345.987",
+/// });
+/// let expected = Timestamps {
+///     dt_f64: Utc.timestamp(-12345, 500_000_000),
+///     dt_string: Local.timestamp(12345, 987_000_000),
+/// };
+/// assert_eq!(expected, serde_json::from_value(json).unwrap());
+/// # }
+/// ```
+///
+/// [`SystemTime`]: std::time::SystemTime
+/// [DateTime]: chrono_crate::DateTime
+/// [NaiveDateTime]: chrono_crate::NaiveDateTime
+/// [feature flag]: https://docs.rs/serde_with/1.14.0/serde_with/guide/feature_flags/index.html
+#[derive(Copy, Clone, Debug, Default)]
+pub struct TimestampSecondsWithFrac<
+    FORMAT: formats::Format = f64,
+    STRICTNESS: formats::Strictness = formats::Strict,
+>(PhantomData<(FORMAT, STRICTNESS)>);
+
+/// Equivalent to [`TimestampSeconds`] with milli-seconds as base unit.
+///
+/// This type is equivalent to [`TimestampSeconds`] except that each unit represents 1 milli-second instead of 1 second for [`TimestampSeconds`].
+#[derive(Copy, Clone, Debug, Default)]
+pub struct TimestampMilliSeconds<
+    FORMAT: formats::Format = i64,
+    STRICTNESS: formats::Strictness = formats::Strict,
+>(PhantomData<(FORMAT, STRICTNESS)>);
+
+/// Equivalent to [`TimestampSecondsWithFrac`] with milli-seconds as base unit.
+///
+/// This type is equivalent to [`TimestampSecondsWithFrac`] except that each unit represents 1 milli-second instead of 1 second for [`TimestampSecondsWithFrac`].
+#[derive(Copy, Clone, Debug, Default)]
+pub struct TimestampMilliSecondsWithFrac<
+    FORMAT: formats::Format = f64,
+    STRICTNESS: formats::Strictness = formats::Strict,
+>(PhantomData<(FORMAT, STRICTNESS)>);
+
+/// Equivalent to [`TimestampSeconds`] with micro-seconds as base unit.
+///
+/// This type is equivalent to [`TimestampSeconds`] except that each unit represents 1 micro-second instead of 1 second for [`TimestampSeconds`].
+#[derive(Copy, Clone, Debug, Default)]
+pub struct TimestampMicroSeconds<
+    FORMAT: formats::Format = i64,
+    STRICTNESS: formats::Strictness = formats::Strict,
+>(PhantomData<(FORMAT, STRICTNESS)>);
+
+/// Equivalent to [`TimestampSecondsWithFrac`] with micro-seconds as base unit.
+///
+/// This type is equivalent to [`TimestampSecondsWithFrac`] except that each unit represents 1 micro-second instead of 1 second for [`TimestampSecondsWithFrac`].
+#[derive(Copy, Clone, Debug, Default)]
+pub struct TimestampMicroSecondsWithFrac<
+    FORMAT: formats::Format = f64,
+    STRICTNESS: formats::Strictness = formats::Strict,
+>(PhantomData<(FORMAT, STRICTNESS)>);
+
+/// Equivalent to [`TimestampSeconds`] with nano-seconds as base unit.
+///
+/// This type is equivalent to [`TimestampSeconds`] except that each unit represents 1 nano-second instead of 1 second for [`TimestampSeconds`].
+#[derive(Copy, Clone, Debug, Default)]
+pub struct TimestampNanoSeconds<
+    FORMAT: formats::Format = i64,
+    STRICTNESS: formats::Strictness = formats::Strict,
+>(PhantomData<(FORMAT, STRICTNESS)>);
+
+/// Equivalent to [`TimestampSecondsWithFrac`] with nano-seconds as base unit.
+///
+/// This type is equivalent to [`TimestampSecondsWithFrac`] except that each unit represents 1 nano-second instead of 1 second for [`TimestampSecondsWithFrac`].
+#[derive(Copy, Clone, Debug, Default)]
+pub struct TimestampNanoSecondsWithFrac<
+    FORMAT: formats::Format = f64,
+    STRICTNESS: formats::Strictness = formats::Strict,
+>(PhantomData<(FORMAT, STRICTNESS)>);
+
+/// Optimized handling of owned and borrowed byte representations.
+///
+/// Serialization of byte sequences like `&[u8]` or `Vec<u8>` is quite inefficient since each value will be serialized individually.
+/// This converter type optimizes the serialization and deserialization.
+///
+/// This is a port of the [`serde_bytes`] crate making it compatible with the `serde_as`-annotation, which allows it to be used in more cases than provided by [`serde_bytes`].
+///
+/// The type provides de/serialization for these types:
+///
+/// * `[u8; N]`, not possible using `serde_bytes`
+/// * `&[u8; N]`, not possible using `serde_bytes`
+/// * `&[u8]`
+/// * `Box<[u8; N]>`, not possible using `serde_bytes`
+/// * `Box<[u8]>`
+/// * `Vec<u8>`
+/// * `Cow<'_, [u8]>`
+/// * `Cow<'_, [u8; N]>`, not possible using `serde_bytes`
+///
+/// [`serde_bytes`]: https://crates.io/crates/serde_bytes
+///
+/// # Examples
+///
+/// ```
+/// # #[cfg(feature = "macros")] {
+/// # use serde::{Deserialize, Serialize};
+/// # use serde_with::{serde_as, Bytes};
+/// # use std::borrow::Cow;
+/// #
+/// #[serde_as]
+/// # #[derive(Debug, PartialEq)]
+/// #[derive(Deserialize, Serialize)]
+/// struct Test<'a> {
+/// #   #[cfg(FALSE)]
+///     #[serde_as(as = "Bytes")]
+///     array: [u8; 15],
+///     #[serde_as(as = "Bytes")]
+///     boxed: Box<[u8]>,
+///     #[serde_as(as = "Bytes")]
+///     #[serde(borrow)]
+///     cow: Cow<'a, [u8]>,
+/// #   #[cfg(FALSE)]
+///     #[serde_as(as = "Bytes")]
+///     #[serde(borrow)]
+///     cow_array: Cow<'a, [u8; 15]>,
+///     #[serde_as(as = "Bytes")]
+///     vec: Vec<u8>,
+/// }
+///
+/// let value = Test {
+/// #   #[cfg(FALSE)]
+///     array: b"0123456789ABCDE".clone(),
+///     boxed: b"...".to_vec().into_boxed_slice(),
+///     cow: Cow::Borrowed(b"FooBar"),
+/// #   #[cfg(FALSE)]
+///     cow_array: Cow::Borrowed(&[42u8; 15]),
+///     vec: vec![0x41, 0x61, 0x21],
+/// };
+/// let expected = r#"(
+///     array: "MDEyMzQ1Njc4OUFCQ0RF",
+///     boxed: "Li4u",
+///     cow: "Rm9vQmFy",
+///     cow_array: "KioqKioqKioqKioqKioq",
+///     vec: "QWEh",
+/// )"#;
+/// # drop(expected);
+/// # // Create a fake expected value that doesn't use const generics
+/// # let expected = r#"(
+/// #     boxed: "Li4u",
+/// #     cow: "Rm9vQmFy",
+/// #     vec: "QWEh",
+/// # )"#;
+///
+/// # let pretty_config = ron::ser::PrettyConfig::new()
+/// #     .new_line("\n".into());
+/// assert_eq!(expected, ron::ser::to_string_pretty(&value, pretty_config).unwrap());
+/// assert_eq!(value, ron::from_str(&expected).unwrap());
+/// # }
+/// ```
+///
+/// Fully borrowed types can also be used but you'll need a Deserializer that
+/// supports Serde's 0-copy deserialization:
+///
+/// ```
+/// # #[cfg(feature = "macros")] {
+/// # use serde::{Deserialize, Serialize};
+/// # use serde_with::{serde_as, Bytes};
+/// # use std::borrow::Cow;
+/// #
+/// #[serde_as]
+/// # #[derive(Debug, PartialEq)]
+/// #[derive(Deserialize, Serialize)]
+/// struct TestBorrows<'a> {
+/// #   #[cfg(FALSE)]
+///     #[serde_as(as = "Bytes")]
+///     #[serde(borrow)]
+///     array_buf: &'a [u8; 15],
+///     #[serde_as(as = "Bytes")]
+///     #[serde(borrow)]
+///     buf: &'a [u8],
+/// }
+///
+/// let value = TestBorrows {
+/// #   #[cfg(FALSE)]
+///     array_buf: &[10u8; 15],
+///     buf: &[20u8, 21u8, 22u8],
+/// };
+/// let expected = r#"(
+///     array_buf: "CgoKCgoKCgoKCgoKCgoK",
+///     buf: "FBUW",
+/// )"#;
+/// # drop(expected);
+/// # // Create a fake expected value that doesn't use const generics
+/// # let expected = r#"(
+/// #     buf: "FBUW",
+/// # )"#;
+///
+/// # let pretty_config = ron::ser::PrettyConfig::new()
+/// #     .new_line("\n".into());
+/// assert_eq!(expected, ron::ser::to_string_pretty(&value, pretty_config).unwrap());
+/// // RON doesn't support borrowed deserialization of byte arrays
+/// # }
+/// ```
+///
+/// ## Alternative to [`BytesOrString`]
+///
+/// The [`Bytes`] can replace [`BytesOrString`].
+/// [`Bytes`] is implemented for more types, which makes it better.
+/// The serialization behavior of [`Bytes`] differs from [`BytesOrString`], therefore only `deserialize_as` should be used.
+///
+/// ```rust
+/// # #[cfg(feature = "macros")] {
+/// # use serde::Deserialize;
+/// # use serde_json::json;
+/// # use serde_with::{serde_as, Bytes};
+/// #
+/// #[serde_as]
+/// # #[derive(Debug, PartialEq)]
+/// #[derive(Deserialize, serde::Serialize)]
+/// struct Test {
+///     #[serde_as(deserialize_as = "Bytes")]
+///     from_bytes: Vec<u8>,
+///     #[serde_as(deserialize_as = "Bytes")]
+///     from_str: Vec<u8>,
+/// }
+///
+/// // Different serialized values ...
+/// let j = json!({
+///     "from_bytes": [70,111,111,45,66,97,114],
+///     "from_str": "Foo-Bar",
+/// });
+///
+/// // can be deserialized ...
+/// let test = Test {
+///     from_bytes: b"Foo-Bar".to_vec(),
+///     from_str: b"Foo-Bar".to_vec(),
+/// };
+/// assert_eq!(test, serde_json::from_value(j).unwrap());
+///
+/// // and serialization will always be a byte sequence
+/// # assert_eq!(json!(
+/// {
+///     "from_bytes": [70,111,111,45,66,97,114],
+///     "from_str": [70,111,111,45,66,97,114],
+/// }
+/// # ), serde_json::to_value(&test).unwrap());
+/// # }
+/// ```
+#[derive(Copy, Clone, Debug, Default)]
+pub struct Bytes;
+
+/// Deserialize one or many elements
+///
+/// Sometimes it is desirable to have a shortcut in writing 1-element lists in a config file.
+/// Usually, this is done by either writing a list or the list element itself.
+/// This distinction is not semantically important on the Rust side, thus both forms should deserialize into the same `Vec`.
+///
+/// The `OneOrMany` adapter achieves exactly this use case.
+/// The serialization behavior can be tweaked to either always serialize as a list using `PreferMany` or to serialize as the inner element if possible using `PreferOne`.
+/// By default, `PreferOne` is assumed, which can also be omitted like `OneOrMany<_>`.
+///
+/// # Examples
+///
+/// ```rust
+/// # #[cfg(feature = "macros")] {
+/// # use serde::Deserialize;
+/// # use serde_json::json;
+/// # use serde_with::{serde_as, OneOrMany};
+/// # use serde_with::formats::{PreferOne, PreferMany};
+/// #
+/// #[serde_as]
+/// # #[derive(Debug, PartialEq)]
+/// #[derive(Deserialize, serde::Serialize)]
+/// struct Data {
+///     #[serde_as(deserialize_as = "OneOrMany<_, PreferOne>")]
+///     countries: Vec<String>,
+///     #[serde_as(deserialize_as = "OneOrMany<_, PreferMany>")]
+///     cities: Vec<String>,
+/// }
+///
+/// // The adapter allows deserializing a `Vec` from either
+/// // a single element
+/// let j = json!({
+///     "countries": "Spain",
+///     "cities": "Berlin",
+/// });
+/// assert!(serde_json::from_value::<Data>(j).is_ok());
+///
+/// // or from a list.
+/// let j = json!({
+///     "countries": ["Germany", "France"],
+///     "cities": ["Amsterdam"],
+/// });
+/// assert!(serde_json::from_value::<Data>(j).is_ok());
+///
+/// // For serialization you can choose how a single element should be encoded.
+/// // Either directly, with `PreferOne` (default), or as a list with `PreferMany`.
+/// let data = Data {
+///     countries: vec!["Spain".to_string()],
+///     cities: vec!["Berlin".to_string()],
+/// };
+/// let j = json!({
+///     "countries": "Spain",
+///     "cities": ["Berlin"],
+/// });
+/// assert_eq!(data, serde_json::from_value(j).unwrap());
+/// # }
+/// ```
+#[derive(Copy, Clone, Debug, Default)]
+pub struct OneOrMany<T, FORMAT: formats::Format = formats::PreferOne>(PhantomData<(T, FORMAT)>);
+
+/// Try multiple deserialization options until one succeeds.
+///
+/// This adapter allows you to specify a list of deserialization options.
+/// They are tried in order and the first one working is applied.
+/// Serialization always picks the first option.
+///
+/// `PickFirst` has one type parameter which must be instantiated with a tuple of two, three, or four elements.
+/// For example, `PickFirst<(_, DisplayFromStr)>` on a field of type `u32` allows deserializing from a number or from a string via the `FromStr` trait.
+/// The value will be serialized as a number, since that is what the first type `_` indicates.
+///
+/// # Examples
+///
+/// Deserialize a number from either a number or a string.
+///
+/// ```rust
+/// # #[cfg(feature = "macros")] {
+/// # use serde::{Deserialize, Serialize};
+/// # use serde_json::json;
+/// # use serde_with::{serde_as, DisplayFromStr, PickFirst};
+/// #
+/// #[serde_as]
+/// # #[derive(Debug, PartialEq)]
+/// #[derive(Deserialize, Serialize)]
+/// struct Data {
+///     #[serde_as(as = "PickFirst<(_, DisplayFromStr)>")]
+///     as_number: u32,
+///     #[serde_as(as = "PickFirst<(DisplayFromStr, _)>")]
+///     as_string: u32,
+/// }
+/// let data = Data {
+///     as_number: 123,
+///     as_string: 456
+/// };
+///
+/// // Both fields can be deserialized from numbers:
+/// let j = json!({
+///     "as_number": 123,
+///     "as_string": 456,
+/// });
+/// assert_eq!(data, serde_json::from_value(j).unwrap());
+///
+/// // or from a string:
+/// let j = json!({
+///     "as_number": "123",
+///     "as_string": "456",
+/// });
+/// assert_eq!(data, serde_json::from_value(j).unwrap());
+///
+/// // For serialization the first type in the tuple determines the behavior.
+/// // The `as_number` field will use the normal `Serialize` behavior and produce a number,
+/// // while `as_string` used `Display` to produce a string.
+/// let expected = json!({
+///     "as_number": 123,
+///     "as_string": "456",
+/// });
+/// assert_eq!(expected, serde_json::to_value(&data).unwrap());
+/// # }
+/// ```
+#[derive(Copy, Clone, Debug, Default)]
+pub struct PickFirst<T>(PhantomData<T>);
+
+/// Serialize value by converting to/from a proxy type with serde support.
+///
+/// This adapter serializes a type `O` by converting it into a second type `T` and serializing `T`.
+/// Deserializing works analogue, by deserializing a `T` and then converting into `O`.
+///
+/// ```rust
+/// # #[cfg(FALSE)] {
+/// struct S {
+///     #[serde_as(as = "FromInto<T>")]
+///     value: O,
+/// }
+/// # }
+/// ```
+///
+/// For serialization `O` needs to be `O: Into<T> + Clone`.
+/// For deserialization the opposite `T: Into<O>` is required.
+/// The `Clone` bound is required since `serialize` operates on a reference but `Into` implementations on references are uncommon.
+///
+/// **Note**: [`TryFromInto`] is the more generalized version of this adapter which uses the [`TryInto`](std::convert::TryInto) trait instead.
+///
+/// # Example
+///
+/// ```rust
+/// # #[cfg(feature = "macros")] {
+/// # use serde::{Deserialize, Serialize};
+/// # use serde_json::json;
+/// # use serde_with::{serde_as, FromInto};
+/// #
+/// #[derive(Clone, Debug, PartialEq)]
+/// struct Rgb {
+///     red: u8,
+///     green: u8,
+///     blue: u8,
+/// }
+///
+/// # /*
+/// impl From<(u8, u8, u8)> for Rgb { ... }
+/// impl From<Rgb> for (u8, u8, u8) { ... }
+/// # */
+/// #
+/// # impl From<(u8, u8, u8)> for Rgb {
+/// #     fn from(v: (u8, u8, u8)) -> Self {
+/// #         Rgb {
+/// #             red: v.0,
+/// #             green: v.1,
+/// #             blue: v.2,
+/// #         }
+/// #     }
+/// # }
+/// #
+/// # impl From<Rgb> for (u8, u8, u8) {
+/// #     fn from(v: Rgb) -> Self {
+/// #         (v.red, v.green, v.blue)
+/// #     }
+/// # }
+///
+/// #[serde_as]
+/// # #[derive(Debug, PartialEq)]
+/// #[derive(Deserialize, Serialize)]
+/// struct Color {
+///     #[serde_as(as = "FromInto<(u8, u8, u8)>")]
+///     rgb: Rgb,
+/// }
+/// let color = Color {
+///     rgb: Rgb {
+///         red: 128,
+///         green: 64,
+///         blue: 32,
+///     },
+/// };
+///
+/// // Define our expected JSON form
+/// let j = json!({
+///     "rgb": [128, 64, 32],
+/// });
+/// // Ensure serialization and deserialization produce the expected results
+/// assert_eq!(j, serde_json::to_value(&color).unwrap());
+/// assert_eq!(color, serde_json::from_value(j).unwrap());
+/// # }
+/// ```
+#[derive(Copy, Clone, Debug, Default)]
+pub struct FromInto<T>(PhantomData<T>);
+
+/// Serialize value by converting to/from a proxy type with serde support.
+///
+/// This adapter serializes a type `O` by converting it into a second type `T` and serializing `T`.
+/// Deserializing works analogue, by deserializing a `T` and then converting into `O`.
+///
+/// ```rust
+/// # #[cfg(FALSE)] {
+/// struct S {
+///     #[serde_as(as = "TryFromInto<T>")]
+///     value: O,
+/// }
+/// # }
+/// ```
+///
+/// For serialization `O` needs to be `O: TryInto<T> + Clone`.
+/// For deserialization the opposite `T: TryInto<O>` is required.
+/// The `Clone` bound is required since `serialize` operates on a reference but `TryInto` implementations on references are uncommon.
+/// In both cases the `TryInto::Error` type must implement [`Display`](std::fmt::Display).
+///
+/// **Note**: [`FromInto`] is the more specialized version of this adapter which uses the infallible [`Into`] trait instead.
+/// [`TryFromInto`] is strictly more general and can also be used where [`FromInto`] is applicable.
+/// The example shows a use case, when only the deserialization behavior is fallible, but not serializing.
+///
+/// # Example
+///
+/// ```rust
+/// # #[cfg(feature = "macros")] {
+/// # use serde::{Deserialize, Serialize};
+/// # use serde_json::json;
+/// # use serde_with::{serde_as, TryFromInto};
+/// # use std::convert::TryFrom;
+/// #
+/// #[derive(Clone, Debug, PartialEq)]
+/// enum Boollike {
+///     True,
+///     False,
+/// }
+///
+/// # /*
+/// impl From<Boollike> for u8 { ... }
+/// # */
+/// #
+/// impl TryFrom<u8> for Boollike {
+///     type Error = String;
+///     fn try_from(v: u8) -> Result<Self, Self::Error> {
+///         match v {
+///             0 => Ok(Boollike::False),
+///             1 => Ok(Boollike::True),
+///             _ => Err(format!("Boolikes can only be constructed from 0 or 1 but found {}", v))
+///         }
+///     }
+/// }
+/// #
+/// # impl From<Boollike> for u8 {
+/// #     fn from(v: Boollike) -> Self {
+/// #        match v {
+/// #            Boollike::True => 1,
+/// #            Boollike::False => 0,
+/// #        }
+/// #     }
+/// # }
+///
+/// #[serde_as]
+/// # #[derive(Debug, PartialEq)]
+/// #[derive(Deserialize, Serialize)]
+/// struct Data {
+///     #[serde_as(as = "TryFromInto<u8>")]
+///     b: Boollike,
+/// }
+/// let data = Data {
+///     b: Boollike::True,
+/// };
+///
+/// // Define our expected JSON form
+/// let j = json!({
+///     "b": 1,
+/// });
+/// // Ensure serialization and deserialization produce the expected results
+/// assert_eq!(j, serde_json::to_value(&data).unwrap());
+/// assert_eq!(data, serde_json::from_value(j).unwrap());
+///
+/// // Numbers besides 0 or 1 should be an error
+/// let j = json!({
+///     "b": 2,
+/// });
+/// assert_eq!("Boolikes can only be constructed from 0 or 1 but found 2", serde_json::from_value::<Data>(j).unwrap_err().to_string());
+/// # }
+/// ```
+#[derive(Copy, Clone, Debug, Default)]
+pub struct TryFromInto<T>(PhantomData<T>);
+
+/// Borrow `Cow` data during deserialization when possible.
+///
+/// The types `Cow<'a, [u8]>`, `Cow<'a, [u8; N]>`, and `Cow<'a, str>` can borrow from the input data during deserialization.
+/// serde supports this, by annotating the fields with `#[serde(borrow)]`. but does not support borrowing on nested types.
+/// This gap is filled by this `BorrowCow` adapter.
+///
+/// Using this adapter with `Cow<'a, [u8]>`/Cow<'a, [u8; N]>` will serialize the value as a sequence of `u8` values.
+/// This *might* not allow to borrow the data during deserialization.
+/// For a different format, which is also more efficient, use the [`Bytes`] adapter, which is also implemented for `Cow`.
+///
+/// When combined with the [`serde_as`] attribute, the `#[serde(borrow)]` annotation will be added automatically.
+/// If the annotation is wrong or too broad, for example because of multiple lifetime parameters, a manual annotation is required.
+///
+/// # Examples
+///
+/// ```rust
+/// # #[cfg(feature = "macros")] {
+/// # use serde::{Deserialize, Serialize};
+/// # use serde_with::{serde_as, BorrowCow};
+/// # use std::borrow::Cow;
+/// #
+/// #[serde_as]
+/// # #[derive(Debug, PartialEq)]
+/// #[derive(Deserialize, Serialize)]
+/// struct Data<'a, 'b, 'c> {
+///     #[serde_as(as = "BorrowCow")]
+///     str: Cow<'a, str>,
+///     #[serde_as(as = "BorrowCow")]
+///     slice: Cow<'b, [u8]>,
+///
+///     #[serde_as(as = "Option<[BorrowCow; 1]>")]
+///     nested: Option<[Cow<'c, str>; 1]>,
+/// }
+/// let data = Data {
+///     str: "foobar".into(),
+///     slice: b"foobar"[..].into(),
+///     nested: Some(["HelloWorld".into()]),
+/// };
+///
+/// // Define our expected JSON form
+/// let j = r#"{
+///   "str": "foobar",
+///   "slice": [
+///     102,
+///     111,
+///     111,
+///     98,
+///     97,
+///     114
+///   ],
+///   "nested": [
+///     "HelloWorld"
+///   ]
+/// }"#;
+/// // Ensure serialization and deserialization produce the expected results
+/// assert_eq!(j, serde_json::to_string_pretty(&data).unwrap());
+/// assert_eq!(data, serde_json::from_str(j).unwrap());
+///
+/// // Cow borrows from the input data
+/// let deserialized: Data<'_, '_, '_> = serde_json::from_str(j).unwrap();
+/// assert!(matches!(deserialized.str, Cow::Borrowed(_)));
+/// assert!(matches!(deserialized.nested, Some([Cow::Borrowed(_)])));
+/// // JSON does not allow borrowing bytes, so `slice` does not borrow
+/// assert!(matches!(deserialized.slice, Cow::Owned(_)));
+/// # }
+/// ```
+#[derive(Copy, Clone, Debug, Default)]
+pub struct BorrowCow;
+
+/// Deserialize a sequence into `Vec<T>`, skipping elements which fail to deserialize.
+///
+/// The serialization behavior is identical to `Vec<T>`. This is an alternative to `Vec<T>`
+/// which is resilient against unexpected data.
+///
+/// # Examples
+///
+/// ```rust
+/// # #[cfg(feature = "macros")] {
+/// # use serde::{Deserialize, Serialize};
+/// # use serde_with::{serde_as, VecSkipError};
+/// #
+/// # #[derive(Debug, PartialEq)]
+/// #[derive(Deserialize, Serialize)]
+/// # #[non_exhaustive]
+/// enum Color {
+///     Red,
+///     Green,
+///     Blue,
+/// }
+/// # use Color::*;
+/// #[serde_as]
+/// # #[derive(Debug, PartialEq)]
+/// #[derive(Deserialize, Serialize)]
+/// struct Palette(#[serde_as(as = "VecSkipError<_>")] Vec<Color>);
+///
+/// let data = Palette(vec![Blue, Green,]);
+/// let source_json = r#"["Blue", "Yellow", "Green"]"#;
+/// let data_json = r#"["Blue","Green"]"#;
+/// // Ensure serialization and deserialization produce the expected results
+/// assert_eq!(data_json, serde_json::to_string(&data).unwrap());
+/// assert_eq!(data, serde_json::from_str(source_json).unwrap());
+/// # }
+/// ```
+
+#[derive(Copy, Clone, Debug, Default)]
+pub struct VecSkipError<T>(PhantomData<T>);
+
+/// Deserialize a boolean from a number
+///
+/// Deserialize a number (of `u8`) and turn it into a boolean.
+/// The adapter supports a [`Strict`](crate::formats::Strict) and [`Flexible`](crate::formats::Flexible) format.
+/// In `Strict` mode, the number must be `0` or `1`.
+/// All other values produce an error.
+/// In `Flexible` mode, the number any non-zero value is converted to `true`.
+///
+/// During serialization only `0` or `1` are ever emitted.
+///
+/// # Examples
+///
+/// ```rust
+/// # #[cfg(feature = "macros")] {
+/// # use serde::{Deserialize, Serialize};
+/// # use serde_json::json;
+/// # use serde_with::{serde_as, BoolFromInt};
+/// #
+/// #[serde_as]
+/// # #[derive(Debug, PartialEq)]
+/// #[derive(Deserialize, Serialize)]
+/// struct Data(#[serde_as(as = "BoolFromInt")] bool);
+///
+/// let data = Data(true);
+/// let j = json!(1);
+/// // Ensure serialization and deserialization produce the expected results
+/// assert_eq!(j, serde_json::to_value(&data).unwrap());
+/// assert_eq!(data, serde_json::from_value(j).unwrap());
+///
+/// // false maps to 0
+/// let data = Data(false);
+/// let j = json!(0);
+/// assert_eq!(j, serde_json::to_value(&data).unwrap());
+/// assert_eq!(data, serde_json::from_value(j).unwrap());
+//
+/// #[serde_as]
+/// # #[derive(Debug, PartialEq)]
+/// #[derive(Deserialize, Serialize)]
+/// struct Flexible(#[serde_as(as = "BoolFromInt<serde_with::formats::Flexible>")] bool);
+///
+/// // Flexible turns any non-zero number into true
+/// let data = Flexible(true);
+/// let j = json!(100);
+/// assert_eq!(data, serde_json::from_value(j).unwrap());
+/// # }
+/// ```
+#[derive(Copy, Clone, Debug, Default)]
+pub struct BoolFromInt<S: formats::Strictness = formats::Strict>(PhantomData<S>);
diff --git a/third_party/rust/serde_with/src/rust.rs b/third_party/rust/serde_with/src/rust.rs
new file mode 100644
index 0000000000..cb64f0da9f
--- /dev/null
+++ b/third_party/rust/serde_with/src/rust.rs
@@ -0,0 +1,1943 @@
+//! De/Serialization for Rust's builtin and std types
+
+use crate::{utils, Separator};
+#[cfg(doc)]
+use alloc::collections::BTreeMap;
+use alloc::{
+    string::{String, ToString},
+    vec::Vec,
+};
+use core::{
+    cmp::Eq,
+    fmt::{self, Display},
+    hash::Hash,
+    iter::FromIterator,
+    marker::PhantomData,
+    str::FromStr,
+};
+use serde::{
+    de::{Deserialize, DeserializeOwned, Deserializer, Error, MapAccess, SeqAccess, Visitor},
+    ser::{Serialize, Serializer},
+};
+#[cfg(doc)]
+use std::collections::HashMap;
+
+/// De/Serialize using [`Display`] and [`FromStr`] implementation
+///
+/// This allows deserializing a string as a number.
+/// It can be very useful for serialization formats like JSON, which do not support integer
+/// numbers and have to resort to strings to represent them.
+///
+/// If you control the type you want to de/serialize, you can instead use the two derive macros, [`SerializeDisplay`] and [`DeserializeFromStr`].
+/// They properly implement the traits [`Serialize`] and [`Deserialize`] such that user of the type no longer have to use the with-attribute.
+///
+/// ## Converting to `serde_as`
+///
+/// The same functionality can be more clearly expressed via [`DisplayFromStr`] and using the [`serde_as`] macro.
+///
+/// ```rust
+/// # #[cfg(feature = "macros")] {
+/// # use serde::Deserialize;
+/// # use serde_with::{serde_as, DisplayFromStr};
+/// #
+/// #[serde_as]
+/// #[derive(Deserialize)]
+/// struct A {
+///     #[serde_as(as = "DisplayFromStr")]
+///     value: mime::Mime,
+/// }
+/// # }
+/// ```
+///
+/// # Examples
+///
+/// ```rust
+/// # use serde::{Deserialize, Serialize};
+/// #
+/// #[derive(Deserialize, Serialize)]
+/// struct A {
+///     #[serde(with = "serde_with::rust::display_fromstr")]
+///     mime: mime::Mime,
+///     #[serde(with = "serde_with::rust::display_fromstr")]
+///     number: u32,
+/// }
+///
+/// let v: A = serde_json::from_str(r#"{
+///     "mime": "text/plain",
+///     "number": "159"
+/// }"#).unwrap();
+/// assert_eq!(mime::TEXT_PLAIN, v.mime);
+/// assert_eq!(159, v.number);
+///
+/// let x = A {
+///     mime: mime::STAR_STAR,
+///     number: 777,
+/// };
+/// assert_eq!(
+///     r#"{"mime":"*/*","number":"777"}"#,
+///     serde_json::to_string(&x).unwrap()
+/// );
+/// ```
+///
+/// [`DeserializeFromStr`]: serde_with_macros::DeserializeFromStr
+/// [`DisplayFromStr`]: crate::DisplayFromStr
+/// [`serde_as`]: crate::guide::serde_as
+/// [`SerializeDisplay`]: serde_with_macros::SerializeDisplay
+pub mod display_fromstr {
+    use super::*;
+
+    /// Deserialize T using [`FromStr`]
+    pub fn deserialize<'de, D, T>(deserializer: D) -> Result<T, D::Error>
+    where
+        D: Deserializer<'de>,
+        T: FromStr,
+        T::Err: Display,
+    {
+        struct Helper<S>(PhantomData<S>);
+
+        impl<'de, S> Visitor<'de> for Helper<S>
+        where
+            S: FromStr,
+            <S as FromStr>::Err: Display,
+        {
+            type Value = S;
+
+            fn expecting(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
+                write!(formatter, "a string")
+            }
+
+            fn visit_str<E>(self, value: &str) -> Result<Self::Value, E>
+            where
+                E: Error,
+            {
+                value.parse::<Self::Value>().map_err(Error::custom)
+            }
+        }
+
+        deserializer.deserialize_str(Helper(PhantomData))
+    }
+
+    /// Serialize T using [Display]
+    pub fn serialize<T, S>(value: &T, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        T: Display,
+        S: Serializer,
+    {
+        serializer.collect_str(&value)
+    }
+}
+
+/// De/Serialize sequences using [`FromIterator`] and [`IntoIterator`] implementation for it and [`Display`] and [`FromStr`] implementation for each element
+///
+/// This allows to serialize and deserialize collections with elements which can be represented as strings.
+///
+/// ## Converting to `serde_as`
+///
+/// The same functionality can be more clearly expressed via [`DisplayFromStr`] and using the [`serde_as`] macro.
+/// Instead of
+///
+/// ```rust,ignore
+/// #[serde(with = "serde_with::rust::seq_display_fromstr")]
+/// addresses: BTreeSet<Ipv4Addr>,
+/// ```
+/// you can write:
+/// ```rust,ignore
+/// #[serde_as(as = "BTreeSet<DisplayFromStr>")]
+/// addresses: BTreeSet<Ipv4Addr>,
+/// ```
+///
+/// This works for any container type, so also for `Vec`:
+/// ```rust,ignore
+/// #[serde_as(as = "Vec<DisplayFromStr>")]
+/// bs: Vec<bool>,
+/// ```
+///
+/// # Examples
+///
+/// ```
+/// # use serde::{Deserialize, Serialize};
+/// #
+/// use std::collections::BTreeSet;
+/// use std::net::Ipv4Addr;
+///
+/// #[derive(Deserialize, Serialize)]
+/// struct A {
+///     #[serde(with = "serde_with::rust::seq_display_fromstr")]
+///     addresses: BTreeSet<Ipv4Addr>,
+///     #[serde(with = "serde_with::rust::seq_display_fromstr")]
+///     bs: Vec<bool>,
+/// }
+///
+/// let v: A = serde_json::from_str(r#"{
+///     "addresses": ["192.168.2.1", "192.168.2.2", "192.168.1.1", "192.168.2.2"],
+///     "bs": ["true", "false"]
+/// }"#).unwrap();
+/// assert_eq!(v.addresses.len(), 3);
+/// assert!(v.addresses.contains(&Ipv4Addr::new(192, 168, 2, 1)));
+/// assert!(v.addresses.contains(&Ipv4Addr::new(192, 168, 2, 2)));
+/// assert!(!v.addresses.contains(&Ipv4Addr::new(192, 168, 1, 2)));
+/// assert_eq!(v.bs.len(), 2);
+/// assert!(v.bs[0]);
+/// assert!(!v.bs[1]);
+///
+/// let x = A {
+///     addresses: vec![
+///         Ipv4Addr::new(127, 53, 0, 1),
+///         Ipv4Addr::new(127, 53, 1, 1),
+///         Ipv4Addr::new(127, 53, 0, 2)
+///     ].into_iter().collect(),
+///     bs: vec![false, true],
+/// };
+/// assert_eq!(
+///     r#"{"addresses":["127.53.0.1","127.53.0.2","127.53.1.1"],"bs":["false","true"]}"#,
+///     serde_json::to_string(&x).unwrap()
+/// );
+/// ```
+///
+/// [`DisplayFromStr`]: crate::DisplayFromStr
+/// [`serde_as`]: crate::guide::serde_as
+pub mod seq_display_fromstr {
+    use super::*;
+
+    /// Deserialize collection T using [FromIterator] and [FromStr] for each element
+    pub fn deserialize<'de, D, T, I>(deserializer: D) -> Result<T, D::Error>
+    where
+        D: Deserializer<'de>,
+        T: FromIterator<I> + Sized,
+        I: FromStr,
+        I::Err: Display,
+    {
+        struct Helper<S>(PhantomData<S>);
+
+        impl<'de, S> Visitor<'de> for Helper<S>
+        where
+            S: FromStr,
+            <S as FromStr>::Err: Display,
+        {
+            type Value = Vec<S>;
+
+            fn expecting(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
+                write!(formatter, "a sequence")
+            }
+
+            fn visit_seq<A>(self, seq: A) -> Result<Self::Value, A::Error>
+            where
+                A: SeqAccess<'de>,
+            {
+                utils::SeqIter::new(seq)
+                    .map(|res| {
+                        res.and_then(|value: &str| value.parse::<S>().map_err(Error::custom))
+                    })
+                    .collect()
+            }
+        }
+
+        deserializer
+            .deserialize_seq(Helper(PhantomData))
+            .map(T::from_iter)
+    }
+
+    /// Serialize collection T using [IntoIterator] and [Display] for each element
+    pub fn serialize<S, T, I>(value: &T, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+        for<'a> &'a T: IntoIterator<Item = &'a I>,
+        I: Display,
+    {
+        struct SerializeString<'a, I>(&'a I);
+
+        impl<'a, I> Serialize for SerializeString<'a, I>
+        where
+            I: Display,
+        {
+            fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+            where
+                S: Serializer,
+            {
+                serializer.collect_str(self.0)
+            }
+        }
+
+        serializer.collect_seq(value.into_iter().map(SerializeString))
+    }
+}
+
+/// De/Serialize a delimited collection using [`Display`] and [`FromStr`] implementation
+///
+/// You can define an arbitrary separator, by specifying a type which implements [`Separator`].
+/// Some common ones, like space and comma are already predefined and you can find them [here][Separator].
+///
+/// An empty string deserializes as an empty collection.
+///
+/// ## Converting to `serde_as`
+///
+/// The same functionality can also be expressed using the [`serde_as`] macro.
+/// The usage is slightly different.
+/// `StringWithSeparator` takes a second type, which needs to implement [`Display`]+[`FromStr`] and constitutes the inner type of the collection.
+///
+/// ```rust
+/// # #[cfg(feature = "macros")] {
+/// # use serde::Deserialize;
+/// # use serde_with::{serde_as, SpaceSeparator, StringWithSeparator};
+/// #
+/// #[serde_as]
+/// #[derive(Deserialize)]
+/// struct A {
+///     #[serde_as(as = "StringWithSeparator::<SpaceSeparator, String>")]
+///     tags: Vec<String>,
+/// }
+/// # }
+/// ```
+///
+/// # Examples
+///
+/// ```
+/// # use serde::{Deserialize, Serialize};
+/// #
+/// use serde_with::{CommaSeparator, SpaceSeparator};
+/// use std::collections::BTreeSet;
+///
+/// #[derive(Deserialize, Serialize)]
+/// struct A {
+///     #[serde(with = "serde_with::rust::StringWithSeparator::<SpaceSeparator>")]
+///     tags: Vec<String>,
+///     #[serde(with = "serde_with::rust::StringWithSeparator::<CommaSeparator>")]
+///     more_tags: BTreeSet<String>,
+/// }
+///
+/// let v: A = serde_json::from_str(r##"{
+///     "tags": "#hello #world",
+///     "more_tags": "foo,bar,bar"
+/// }"##).unwrap();
+/// assert_eq!(vec!["#hello", "#world"], v.tags);
+/// assert_eq!(2, v.more_tags.len());
+///
+/// let x = A {
+///     tags: vec!["1".to_string(), "2".to_string(), "3".to_string()],
+///     more_tags: BTreeSet::new(),
+/// };
+/// assert_eq!(
+///     r#"{"tags":"1 2 3","more_tags":""}"#,
+///     serde_json::to_string(&x).unwrap()
+/// );
+/// ```
+///
+/// [`serde_as`]: crate::guide::serde_as
+#[derive(Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash, Debug, Default)]
+pub struct StringWithSeparator<Sep, T = ()>(PhantomData<(Sep, T)>);
+
+impl<Sep> StringWithSeparator<Sep>
+where
+    Sep: Separator,
+{
+    /// Serialize collection into a string with separator symbol
+    pub fn serialize<S, T, V>(values: T, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+        T: IntoIterator<Item = V>,
+        V: Display,
+    {
+        let mut s = String::new();
+        for v in values {
+            s.push_str(&*v.to_string());
+            s.push_str(Sep::separator());
+        }
+        serializer.serialize_str(if !s.is_empty() {
+            // remove trailing separator if present
+            &s[..s.len() - Sep::separator().len()]
+        } else {
+            &s[..]
+        })
+    }
+
+    /// Deserialize a collection from a string with separator symbol
+    pub fn deserialize<'de, D, T, V>(deserializer: D) -> Result<T, D::Error>
+    where
+        D: Deserializer<'de>,
+        T: FromIterator<V>,
+        V: FromStr,
+        V::Err: Display,
+    {
+        let s = String::deserialize(deserializer)?;
+        if s.is_empty() {
+            Ok(None.into_iter().collect())
+        } else {
+            s.split(Sep::separator())
+                .map(FromStr::from_str)
+                .collect::<Result<_, _>>()
+                .map_err(Error::custom)
+        }
+    }
+}
+
+/// Makes a distinction between a missing, unset, or existing value
+///
+/// Some serialization formats make a distinction between missing fields, fields with a `null`
+/// value, and existing values. One such format is JSON. By default it is not easily possible to
+/// differentiate between a missing value and a field which is `null`, as they deserialize to the
+/// same value. This helper changes it, by using an `Option<Option<T>>` to deserialize into.
+///
+/// * `None`: Represents a missing value.
+/// * `Some(None)`: Represents a `null` value.
+/// * `Some(Some(value))`: Represents an existing value.
+///
+/// # Examples
+///
+/// ```rust
+/// # use serde::{Deserialize, Serialize};
+/// #
+/// # #[derive(Debug, PartialEq, Eq)]
+/// #[derive(Deserialize, Serialize)]
+/// struct Doc {
+///     #[serde(
+///         default,                                    // <- important for deserialization
+///         skip_serializing_if = "Option::is_none",    // <- important for serialization
+///         with = "::serde_with::rust::double_option",
+///     )]
+///     a: Option<Option<u8>>,
+/// }
+/// // Missing Value
+/// let s = r#"{}"#;
+/// assert_eq!(Doc { a: None }, serde_json::from_str(s).unwrap());
+/// assert_eq!(s, serde_json::to_string(&Doc { a: None }).unwrap());
+///
+/// // Unset Value
+/// let s = r#"{"a":null}"#;
+/// assert_eq!(Doc { a: Some(None) }, serde_json::from_str(s).unwrap());
+/// assert_eq!(s, serde_json::to_string(&Doc { a: Some(None) }).unwrap());
+///
+/// // Existing Value
+/// let s = r#"{"a":5}"#;
+/// assert_eq!(Doc { a: Some(Some(5)) }, serde_json::from_str(s).unwrap());
+/// assert_eq!(s, serde_json::to_string(&Doc { a: Some(Some(5)) }).unwrap());
+/// ```
+#[allow(clippy::option_option)]
+pub mod double_option {
+    use super::*;
+
+    /// Deserialize potentially non-existing optional value
+    pub fn deserialize<'de, T, D>(deserializer: D) -> Result<Option<Option<T>>, D::Error>
+    where
+        T: Deserialize<'de>,
+        D: Deserializer<'de>,
+    {
+        Deserialize::deserialize(deserializer).map(Some)
+    }
+
+    /// Serialize optional value
+    pub fn serialize<S, T>(values: &Option<Option<T>>, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+        T: Serialize,
+    {
+        match values {
+            None => serializer.serialize_unit(),
+            Some(None) => serializer.serialize_none(),
+            Some(Some(v)) => serializer.serialize_some(&v),
+        }
+    }
+}
+
+/// Serialize inner value if [`Some`]`(T)`. If [`None`], serialize the unit struct `()`.
+///
+/// When used in conjunction with `skip_serializing_if = "Option::is_none"` and
+/// `default`, you can build an optional value by skipping if it is [`None`], or serializing its
+/// inner value if [`Some`]`(T)`.
+///
+/// Not all serialization formats easily support optional values.
+/// While JSON uses the [`Option`] type to represent optional values and only serializes the inner
+/// part of the [`Some`]`()`, other serialization formats, such as [RON][], choose to serialize the
+/// [`Some`] around a value.
+/// This helper helps building a truly optional value for such serializers.
+///
+/// [RON]: https://github.com/ron-rs/ron
+///
+/// # Example
+///
+/// ```rust
+/// # use serde::{Deserialize, Serialize};
+/// #
+/// # #[derive(Debug, Eq, PartialEq)]
+/// #[derive(Deserialize, Serialize)]
+/// struct Doc {
+///     mandatory: usize,
+///     #[serde(
+///         default,                                    // <- important for deserialization
+///         skip_serializing_if = "Option::is_none",    // <- important for serialization
+///         with = "::serde_with::rust::unwrap_or_skip",
+///     )]
+///     optional: Option<usize>,
+/// }
+///
+/// // Transparently add/remove Some() wrapper
+/// # let pretty_config = ron::ser::PrettyConfig::new()
+/// #     .new_line("\n".into());
+/// let s = r#"(
+///     mandatory: 1,
+///     optional: 2,
+/// )"#;
+/// let v = Doc {
+///     mandatory: 1,
+///     optional: Some(2),
+/// };
+/// assert_eq!(v, ron::de::from_str(s).unwrap());
+/// assert_eq!(s, ron::ser::to_string_pretty(&v, pretty_config).unwrap());
+///
+/// // Missing values are deserialized as `None`
+/// // while `None` values are skipped during serialization.
+/// # let pretty_config = ron::ser::PrettyConfig::new()
+/// #     .new_line("\n".into());
+/// let s = r#"(
+///     mandatory: 1,
+/// )"#;
+/// let v = Doc {
+///     mandatory: 1,
+///     optional: None,
+/// };
+/// assert_eq!(v, ron::de::from_str(s).unwrap());
+/// assert_eq!(s, ron::ser::to_string_pretty(&v, pretty_config).unwrap());
+/// ```
+pub mod unwrap_or_skip {
+    use super::*;
+
+    /// Deserialize value wrapped in Some(T)
+    pub fn deserialize<'de, D, T>(deserializer: D) -> Result<Option<T>, D::Error>
+    where
+        D: Deserializer<'de>,
+        T: DeserializeOwned,
+    {
+        T::deserialize(deserializer).map(Some)
+    }
+
+    /// Serialize value if Some(T), unit struct if None
+    pub fn serialize<T, S>(option: &Option<T>, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        T: Serialize,
+        S: Serializer,
+    {
+        if let Some(value) = option {
+            value.serialize(serializer)
+        } else {
+            ().serialize(serializer)
+        }
+    }
+}
+
+/// Ensure no duplicate values exist in a set.
+///
+/// By default serde has a last-value-wins implementation, if duplicate values for a set exist.
+/// Sometimes it is desirable to know when such an event happens, as the first value is overwritten
+/// and it can indicate an error in the serialized data.
+///
+/// This helper returns an error if two identical values exist in a set.
+///
+/// The implementation supports both the [`HashSet`] and the [`BTreeSet`] from the standard library.
+///
+/// [`HashSet`]: std::collections::HashSet
+/// [`BTreeSet`]: std::collections::HashSet
+///
+/// # Example
+///
+/// ```rust
+/// # use std::{collections::HashSet, iter::FromIterator};
+/// # use serde::Deserialize;
+/// #
+/// # #[derive(Debug, Eq, PartialEq)]
+/// #[derive(Deserialize)]
+/// struct Doc {
+///     #[serde(with = "::serde_with::rust::sets_duplicate_value_is_error")]
+///     set: HashSet<usize>,
+/// }
+///
+/// // Sets are serialized normally,
+/// let s = r#"{"set": [1, 2, 3, 4]}"#;
+/// let v = Doc {
+///     set: HashSet::from_iter(vec![1, 2, 3, 4]),
+/// };
+/// assert_eq!(v, serde_json::from_str(s).unwrap());
+///
+/// // but create an error if duplicate values, like the `1`, exist.
+/// let s = r#"{"set": [1, 2, 3, 4, 1]}"#;
+/// let res: Result<Doc, _> = serde_json::from_str(s);
+/// assert!(res.is_err());
+/// ```
+pub mod sets_duplicate_value_is_error {
+    use super::*;
+    use crate::duplicate_key_impls::PreventDuplicateInsertsSet;
+
+    /// Deserialize a set and return an error on duplicate values
+    pub fn deserialize<'de, D, T, V>(deserializer: D) -> Result<T, D::Error>
+    where
+        T: PreventDuplicateInsertsSet<V>,
+        V: Deserialize<'de>,
+        D: Deserializer<'de>,
+    {
+        struct SeqVisitor<T, V> {
+            marker: PhantomData<T>,
+            set_item_type: PhantomData<V>,
+        }
+
+        impl<'de, T, V> Visitor<'de> for SeqVisitor<T, V>
+        where
+            T: PreventDuplicateInsertsSet<V>,
+            V: Deserialize<'de>,
+        {
+            type Value = T;
+
+            fn expecting(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
+                formatter.write_str("a sequence")
+            }
+
+            #[inline]
+            fn visit_seq<A>(self, mut access: A) -> Result<Self::Value, A::Error>
+            where
+                A: SeqAccess<'de>,
+            {
+                let mut values = Self::Value::new(access.size_hint());
+
+                while let Some(value) = access.next_element()? {
+                    if !values.insert(value) {
+                        return Err(Error::custom("invalid entry: found duplicate value"));
+                    };
+                }
+
+                Ok(values)
+            }
+        }
+
+        let visitor = SeqVisitor {
+            marker: PhantomData,
+            set_item_type: PhantomData,
+        };
+        deserializer.deserialize_seq(visitor)
+    }
+
+    /// Serialize the set with the default serializer
+    pub fn serialize<T, S>(value: &T, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        T: Serialize,
+        S: Serializer,
+    {
+        value.serialize(serializer)
+    }
+}
+
+/// Ensure no duplicate keys exist in a map.
+///
+/// By default serde has a last-value-wins implementation, if duplicate keys for a map exist.
+/// Sometimes it is desirable to know when such an event happens, as the first value is overwritten
+/// and it can indicate an error in the serialized data.
+///
+/// This helper returns an error if two identical keys exist in a map.
+///
+/// The implementation supports both the [`HashMap`] and the [`BTreeMap`] from the standard library.
+///
+/// [`HashMap`]: std::collections::HashMap
+/// [`BTreeMap`]: std::collections::HashMap
+///
+/// # Example
+///
+/// ```rust
+/// # use serde::Deserialize;
+/// # use std::collections::HashMap;
+/// #
+/// # #[derive(Debug, Eq, PartialEq)]
+/// #[derive(Deserialize)]
+/// struct Doc {
+///     #[serde(with = "::serde_with::rust::maps_duplicate_key_is_error")]
+///     map: HashMap<usize, usize>,
+/// }
+///
+/// // Maps are serialized normally,
+/// let s = r#"{"map": {"1": 1, "2": 2, "3": 3}}"#;
+/// let mut v = Doc {
+///     map: HashMap::new(),
+/// };
+/// v.map.insert(1, 1);
+/// v.map.insert(2, 2);
+/// v.map.insert(3, 3);
+/// assert_eq!(v, serde_json::from_str(s).unwrap());
+///
+/// // but create an error if duplicate keys, like the `1`, exist.
+/// let s = r#"{"map": {"1": 1, "2": 2, "1": 3}}"#;
+/// let res: Result<Doc, _> = serde_json::from_str(s);
+/// assert!(res.is_err());
+/// ```
+pub mod maps_duplicate_key_is_error {
+    use super::*;
+    use crate::duplicate_key_impls::PreventDuplicateInsertsMap;
+
+    /// Deserialize a map and return an error on duplicate keys
+    pub fn deserialize<'de, D, T, K, V>(deserializer: D) -> Result<T, D::Error>
+    where
+        T: PreventDuplicateInsertsMap<K, V>,
+        K: Deserialize<'de>,
+        V: Deserialize<'de>,
+        D: Deserializer<'de>,
+    {
+        struct MapVisitor<T, K, V> {
+            marker: PhantomData<T>,
+            map_key_type: PhantomData<K>,
+            map_value_type: PhantomData<V>,
+        }
+
+        impl<'de, T, K, V> Visitor<'de> for MapVisitor<T, K, V>
+        where
+            T: PreventDuplicateInsertsMap<K, V>,
+            K: Deserialize<'de>,
+            V: Deserialize<'de>,
+        {
+            type Value = T;
+
+            fn expecting(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
+                formatter.write_str("a map")
+            }
+
+            #[inline]
+            fn visit_map<A>(self, mut access: A) -> Result<Self::Value, A::Error>
+            where
+                A: MapAccess<'de>,
+            {
+                let mut values = Self::Value::new(access.size_hint());
+
+                while let Some((key, value)) = access.next_entry()? {
+                    if !values.insert(key, value) {
+                        return Err(Error::custom("invalid entry: found duplicate key"));
+                    };
+                }
+
+                Ok(values)
+            }
+        }
+
+        let visitor = MapVisitor {
+            marker: PhantomData,
+            map_key_type: PhantomData,
+            map_value_type: PhantomData,
+        };
+        deserializer.deserialize_map(visitor)
+    }
+
+    /// Serialize the map with the default serializer
+    pub fn serialize<T, S>(value: &T, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        T: Serialize,
+        S: Serializer,
+    {
+        value.serialize(serializer)
+    }
+}
+
+/// *DEPRECATED* Ensure that the first value is taken, if duplicate values exist
+///
+/// This module implements the default behavior in serde.
+#[deprecated = "This module does nothing. Remove the attribute. Serde's default behavior is to use the first value when deserializing a set."]
+#[allow(deprecated)]
+pub mod sets_first_value_wins {
+    use super::*;
+    use crate::duplicate_key_impls::DuplicateInsertsFirstWinsSet;
+
+    /// Deserialize a set and keep the first of equal values
+    #[deprecated = "This function does nothing. Remove the attribute. Serde's default behavior is to use the first value when deserializing a set."]
+    pub fn deserialize<'de, D, T, V>(deserializer: D) -> Result<T, D::Error>
+    where
+        T: DuplicateInsertsFirstWinsSet<V>,
+        V: Deserialize<'de>,
+        D: Deserializer<'de>,
+    {
+        struct SeqVisitor<T, V> {
+            marker: PhantomData<T>,
+            set_item_type: PhantomData<V>,
+        }
+
+        impl<'de, T, V> Visitor<'de> for SeqVisitor<T, V>
+        where
+            T: DuplicateInsertsFirstWinsSet<V>,
+            V: Deserialize<'de>,
+        {
+            type Value = T;
+
+            fn expecting(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
+                formatter.write_str("a sequence")
+            }
+
+            #[inline]
+            fn visit_seq<A>(self, mut access: A) -> Result<Self::Value, A::Error>
+            where
+                A: SeqAccess<'de>,
+            {
+                let mut values = Self::Value::new(access.size_hint());
+
+                while let Some(value) = access.next_element()? {
+                    values.insert(value);
+                }
+
+                Ok(values)
+            }
+        }
+
+        let visitor = SeqVisitor {
+            marker: PhantomData,
+            set_item_type: PhantomData,
+        };
+        deserializer.deserialize_seq(visitor)
+    }
+
+    /// Serialize the set with the default serializer
+    #[deprecated = "This function does nothing. Remove the attribute. Serde's default behavior is to use the first value when deserializing a set."]
+    pub fn serialize<T, S>(value: &T, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        T: Serialize,
+        S: Serializer,
+    {
+        value.serialize(serializer)
+    }
+}
+
+/// Ensure that the last value is taken, if duplicate values exist
+///
+/// By default serde has a first-value-wins implementation, if duplicate keys for a set exist.
+/// Sometimes the opposite strategy is desired. This helper implements a first-value-wins strategy.
+///
+/// The implementation supports both the [`HashSet`] and the [`BTreeSet`] from the standard library.
+///
+/// [`HashSet`]: std::collections::HashSet
+/// [`BTreeSet`]: std::collections::HashSet
+pub mod sets_last_value_wins {
+    use super::*;
+    use crate::duplicate_key_impls::DuplicateInsertsLastWinsSet;
+
+    /// Deserialize a set and keep the last of equal values
+    pub fn deserialize<'de, D, T, V>(deserializer: D) -> Result<T, D::Error>
+    where
+        T: DuplicateInsertsLastWinsSet<V>,
+        V: Deserialize<'de>,
+        D: Deserializer<'de>,
+    {
+        struct SeqVisitor<T, V> {
+            marker: PhantomData<T>,
+            set_item_type: PhantomData<V>,
+        }
+
+        impl<'de, T, V> Visitor<'de> for SeqVisitor<T, V>
+        where
+            T: DuplicateInsertsLastWinsSet<V>,
+            V: Deserialize<'de>,
+        {
+            type Value = T;
+
+            fn expecting(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
+                formatter.write_str("a sequence")
+            }
+
+            #[inline]
+            fn visit_seq<A>(self, mut access: A) -> Result<Self::Value, A::Error>
+            where
+                A: SeqAccess<'de>,
+            {
+                let mut values = Self::Value::new(access.size_hint());
+
+                while let Some(value) = access.next_element()? {
+                    values.replace(value);
+                }
+
+                Ok(values)
+            }
+        }
+
+        let visitor = SeqVisitor {
+            marker: PhantomData,
+            set_item_type: PhantomData,
+        };
+        deserializer.deserialize_seq(visitor)
+    }
+
+    /// Serialize the set with the default serializer
+    pub fn serialize<T, S>(value: &T, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        T: Serialize,
+        S: Serializer,
+    {
+        value.serialize(serializer)
+    }
+}
+
+/// Ensure that the first key is taken, if duplicate keys exist
+///
+/// By default serde has a last-key-wins implementation, if duplicate keys for a map exist.
+/// Sometimes the opposite strategy is desired. This helper implements a first-key-wins strategy.
+///
+/// The implementation supports both the [`HashMap`] and the [`BTreeMap`] from the standard library.
+///
+/// [`HashMap`]: std::collections::HashMap
+/// [`BTreeMap`]: std::collections::HashMap
+///
+/// # Example
+///
+/// ```rust
+/// # use serde::Deserialize;
+/// # use std::collections::HashMap;
+/// #
+/// # #[derive(Debug, Eq, PartialEq)]
+/// #[derive(Deserialize)]
+/// struct Doc {
+///     #[serde(with = "::serde_with::rust::maps_first_key_wins")]
+///     map: HashMap<usize, usize>,
+/// }
+///
+/// // Maps are serialized normally,
+/// let s = r#"{"map": {"1": 1, "2": 2, "3": 3}}"#;
+/// let mut v = Doc {
+///     map: HashMap::new(),
+/// };
+/// v.map.insert(1, 1);
+/// v.map.insert(2, 2);
+/// v.map.insert(3, 3);
+/// assert_eq!(v, serde_json::from_str(s).unwrap());
+///
+/// // but create an error if duplicate keys, like the `1`, exist.
+/// let s = r#"{"map": {"1": 1, "2": 2, "1": 3}}"#;
+/// let mut v = Doc {
+///     map: HashMap::new(),
+/// };
+/// v.map.insert(1, 1);
+/// v.map.insert(2, 2);
+/// assert_eq!(v, serde_json::from_str(s).unwrap());
+/// ```
+pub mod maps_first_key_wins {
+    use super::*;
+    use crate::duplicate_key_impls::DuplicateInsertsFirstWinsMap;
+
+    /// Deserialize a map and return an error on duplicate keys
+    pub fn deserialize<'de, D, T, K, V>(deserializer: D) -> Result<T, D::Error>
+    where
+        T: DuplicateInsertsFirstWinsMap<K, V>,
+        K: Deserialize<'de>,
+        V: Deserialize<'de>,
+        D: Deserializer<'de>,
+    {
+        struct MapVisitor<T, K, V> {
+            marker: PhantomData<T>,
+            map_key_type: PhantomData<K>,
+            map_value_type: PhantomData<V>,
+        }
+
+        impl<'de, T, K, V> Visitor<'de> for MapVisitor<T, K, V>
+        where
+            T: DuplicateInsertsFirstWinsMap<K, V>,
+            K: Deserialize<'de>,
+            V: Deserialize<'de>,
+        {
+            type Value = T;
+
+            fn expecting(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
+                formatter.write_str("a map")
+            }
+
+            #[inline]
+            fn visit_map<A>(self, mut access: A) -> Result<Self::Value, A::Error>
+            where
+                A: MapAccess<'de>,
+            {
+                let mut values = Self::Value::new(access.size_hint());
+
+                while let Some((key, value)) = access.next_entry()? {
+                    values.insert(key, value);
+                }
+
+                Ok(values)
+            }
+        }
+
+        let visitor = MapVisitor {
+            marker: PhantomData,
+            map_key_type: PhantomData,
+            map_value_type: PhantomData,
+        };
+        deserializer.deserialize_map(visitor)
+    }
+
+    /// Serialize the map with the default serializer
+    pub fn serialize<T, S>(value: &T, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        T: Serialize,
+        S: Serializer,
+    {
+        value.serialize(serializer)
+    }
+}
+
+/// De/Serialize a [`Option<String>`] type while transforming the empty string to [`None`]
+///
+/// Convert an [`Option<T>`] from/to string using [`FromStr`] and [`AsRef<str>`] implementations.
+/// An empty string is deserialized as [`None`] and a [`None`] vice versa.
+///
+/// ## Converting to `serde_as`
+///
+/// The same functionality can be more clearly expressed via [`NoneAsEmptyString`] and using the [`serde_as`] macro.
+///
+/// ```rust
+/// # #[cfg(feature = "macros")] {
+/// # use serde::Deserialize;
+/// # use serde_with::{serde_as, NoneAsEmptyString};
+/// #
+/// #[serde_as]
+/// #[derive(Deserialize)]
+/// struct A {
+///     #[serde_as(as = "NoneAsEmptyString")]
+///     value: Option<String>,
+/// }
+/// # }
+/// ```
+///
+/// # Examples
+///
+/// ```
+/// # use serde::{Deserialize, Serialize};
+/// # use serde_json::json;
+/// # use serde_with::rust::string_empty_as_none;
+/// #
+/// #[derive(Deserialize, Serialize)]
+/// struct A {
+///     #[serde(with = "string_empty_as_none")]
+///     tags: Option<String>,
+/// }
+///
+/// let v: A = serde_json::from_value(json!({ "tags": "" })).unwrap();
+/// assert_eq!(None, v.tags);
+///
+/// let v: A = serde_json::from_value(json!({ "tags": "Hi" })).unwrap();
+/// assert_eq!(Some("Hi".to_string()), v.tags);
+///
+/// let x = A {
+///     tags: Some("This is text".to_string()),
+/// };
+/// assert_eq!(json!({ "tags": "This is text" }), serde_json::to_value(&x).unwrap());
+///
+/// let x = A {
+///     tags: None,
+/// };
+/// assert_eq!(json!({ "tags": "" }), serde_json::to_value(&x).unwrap());
+/// ```
+///
+/// [`NoneAsEmptyString`]: crate::NoneAsEmptyString
+/// [`serde_as`]: crate::guide::serde_as
+pub mod string_empty_as_none {
+    use super::*;
+
+    /// Deserialize an `Option<T>` from a string using `FromStr`
+    pub fn deserialize<'de, D, S>(deserializer: D) -> Result<Option<S>, D::Error>
+    where
+        D: Deserializer<'de>,
+        S: FromStr,
+        S::Err: Display,
+    {
+        struct OptionStringEmptyNone<S>(PhantomData<S>);
+        impl<'de, S> Visitor<'de> for OptionStringEmptyNone<S>
+        where
+            S: FromStr,
+            S::Err: Display,
+        {
+            type Value = Option<S>;
+
+            fn expecting(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
+                formatter.write_str("any string")
+            }
+
+            fn visit_str<E>(self, value: &str) -> Result<Self::Value, E>
+            where
+                E: Error,
+            {
+                match value {
+                    "" => Ok(None),
+                    v => S::from_str(v).map(Some).map_err(Error::custom),
+                }
+            }
+
+            fn visit_string<E>(self, value: String) -> Result<Self::Value, E>
+            where
+                E: Error,
+            {
+                match &*value {
+                    "" => Ok(None),
+                    v => S::from_str(v).map(Some).map_err(Error::custom),
+                }
+            }
+
+            // handles the `null` case
+            fn visit_unit<E>(self) -> Result<Self::Value, E>
+            where
+                E: Error,
+            {
+                Ok(None)
+            }
+        }
+
+        deserializer.deserialize_any(OptionStringEmptyNone(PhantomData))
+    }
+
+    /// Serialize a string from `Option<T>` using `AsRef<str>` or using the empty string if `None`.
+    pub fn serialize<T, S>(option: &Option<T>, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        T: AsRef<str>,
+        S: Serializer,
+    {
+        if let Some(value) = option {
+            value.as_ref().serialize(serializer)
+        } else {
+            "".serialize(serializer)
+        }
+    }
+}
+
+/// De/Serialize a Map into a list of tuples
+///
+/// Some formats, like JSON, have limitations on the type of keys for maps.
+/// In case of JSON, keys are restricted to strings.
+/// Rust features more powerful keys, for example tuple, which can not be serialized to JSON.
+///
+/// This helper serializes the Map into a list of tuples, which does not have the same type restrictions.
+/// The module can be applied on any type implementing `IntoIterator<Item = (&'a K, &'a V)>` and `FromIterator<(K, V)>`, with `K` and `V` being the key and value types.
+/// From the standard library both [`HashMap`] and [`BTreeMap`] fullfil the condition and can be used here.
+///
+/// ## Converting to `serde_as`
+///
+/// If the map is of type [`HashMap`] or [`BTreeMap`] the same functionality can be expressed more clearly using the [`serde_as`] macro.
+/// The `_` is a placeholder which works for any type which implements [`Serialize`]/[`Deserialize`], such as the tuple and `u32` type.
+///
+/// ```rust
+/// # #[cfg(feature = "macros")] {
+/// # use serde::{Deserialize, Serialize};
+/// # use serde_with::serde_as;
+/// # use std::collections::{BTreeMap, HashMap};
+/// #
+/// #[serde_as]
+/// #[derive(Deserialize, Serialize)]
+/// struct A {
+///     #[serde_as(as = "Vec<(_, _)>")]
+///     hashmap: HashMap<(String, u32), u32>,
+///     #[serde_as(as = "Vec<(_, _)>")]
+///     btreemap: BTreeMap<(String, u32), u32>,
+/// }
+/// # }
+/// ```
+///
+/// # Examples
+///
+/// ```
+/// # use serde::{Deserialize, Serialize};
+/// # use serde_json::json;
+/// # use std::collections::BTreeMap;
+/// #
+/// #[derive(Deserialize, Serialize)]
+/// struct A {
+///     #[serde(with = "serde_with::rust::map_as_tuple_list")]
+///     s: BTreeMap<(String, u32), u32>,
+/// }
+///
+/// let v: A = serde_json::from_value(json!({
+///     "s": [
+///         [["Hello", 123], 0],
+///         [["World", 456], 1]
+///     ]
+/// })).unwrap();
+///
+/// assert_eq!(2, v.s.len());
+/// assert_eq!(1, v.s[&("World".to_string(), 456)]);
+/// ```
+///
+/// The helper is generic over the hasher type of the [`HashMap`] and works with different variants, such as `FnvHashMap`.
+///
+/// ```
+/// # use serde::{Deserialize, Serialize};
+/// # use serde_json::json;
+/// #
+/// use fnv::FnvHashMap;
+///
+/// #[derive(Deserialize, Serialize)]
+/// struct A {
+///     #[serde(with = "serde_with::rust::map_as_tuple_list")]
+///     s: FnvHashMap<u32, bool>,
+/// }
+///
+/// let v: A = serde_json::from_value(json!({
+///     "s": [
+///         [0, false],
+///         [1, true]
+///     ]
+/// })).unwrap();
+///
+/// assert_eq!(2, v.s.len());
+/// assert_eq!(true, v.s[&1]);
+/// ```
+///
+/// [`serde_as`]: crate::guide::serde_as
+pub mod map_as_tuple_list {
+    // Trait bounds based on this answer: https://stackoverflow.com/a/66600486/15470286
+    use super::*;
+
+    /// Serialize the map as a list of tuples
+    pub fn serialize<'a, T, K, V, S>(map: T, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+        T: IntoIterator<Item = (&'a K, &'a V)>,
+        T::IntoIter: ExactSizeIterator,
+        K: Serialize + 'a,
+        V: Serialize + 'a,
+    {
+        serializer.collect_seq(map)
+    }
+
+    /// Deserialize a map from a list of tuples
+    pub fn deserialize<'de, T, K, V, D>(deserializer: D) -> Result<T, D::Error>
+    where
+        D: Deserializer<'de>,
+        T: FromIterator<(K, V)>,
+        K: Deserialize<'de>,
+        V: Deserialize<'de>,
+    {
+        struct SeqVisitor<T, K, V>(PhantomData<(T, K, V)>);
+
+        impl<'de, T, K, V> Visitor<'de> for SeqVisitor<T, K, V>
+        where
+            T: FromIterator<(K, V)>,
+            K: Deserialize<'de>,
+            V: Deserialize<'de>,
+        {
+            type Value = T;
+
+            fn expecting(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
+                formatter.write_str("a list of key-value pairs")
+            }
+
+            fn visit_seq<A>(self, seq: A) -> Result<Self::Value, A::Error>
+            where
+                A: SeqAccess<'de>,
+            {
+                utils::SeqIter::new(seq).collect()
+            }
+        }
+
+        deserializer.deserialize_seq(SeqVisitor(PhantomData))
+    }
+}
+
+/// DEPRECATED De/Serialize a [`HashMap`] into a list of tuples
+///
+/// Use the [`map_as_tuple_list`] module which is more general than this.
+/// It should work with everything convertible to and from an `Iterator` including [`BTreeMap`] and [`HashMap`].
+///
+/// ---
+///
+/// Some formats, like JSON, have limitations on the type of keys for maps.
+/// In case of JSON, keys are restricted to strings.
+/// Rust features more powerful keys, for example tuple, which can not be serialized to JSON.
+///
+/// This helper serializes the [`HashMap`] into a list of tuples, which does not have the same type restrictions.
+///
+/// If you need to de/serialize a [`BTreeMap`] then use [`btreemap_as_tuple_list`].
+///
+/// ## Converting to `serde_as`
+///
+/// The same functionality can be more clearly expressed using the [`serde_as`] macro.
+/// The `_` is a placeholder which works for any type which implements [`Serialize`]/[`Deserialize`], such as the tuple and `u32` type.
+///
+/// ```rust
+/// # #[cfg(feature = "macros")] {
+/// # use serde::{Deserialize, Serialize};
+/// # use serde_with::serde_as;
+/// # use std::collections::HashMap;
+/// #
+/// #[serde_as]
+/// #[derive(Deserialize, Serialize)]
+/// struct A {
+///     #[serde_as(as = "Vec<(_, _)>")]
+///     s: HashMap<(String, u32), u32>,
+/// }
+/// # }
+/// ```
+///
+/// # Examples
+///
+/// ```
+/// # use serde::{Deserialize, Serialize};
+/// # use serde_json::json;
+/// # use std::collections::HashMap;
+/// #
+/// #[derive(Deserialize, Serialize)]
+/// struct A {
+///     #[serde(with = "serde_with::rust::hashmap_as_tuple_list")]
+///     s: HashMap<(String, u32), u32>,
+/// }
+///
+/// let v: A = serde_json::from_value(json!({
+///     "s": [
+///         [["Hello", 123], 0],
+///         [["World", 456], 1]
+///     ]
+/// })).unwrap();
+///
+/// assert_eq!(2, v.s.len());
+/// assert_eq!(1, v.s[&("World".to_string(), 456)]);
+/// ```
+///
+/// The helper is generic over the hasher type of the [`HashMap`] and works with different variants, such as `FnvHashMap`.
+///
+/// ```
+/// # use serde::{Deserialize, Serialize};
+/// # use serde_json::json;
+/// #
+/// use fnv::FnvHashMap;
+///
+/// #[derive(Deserialize, Serialize)]
+/// struct A {
+///     #[serde(with = "serde_with::rust::hashmap_as_tuple_list")]
+///     s: FnvHashMap<u32, bool>,
+/// }
+///
+/// let v: A = serde_json::from_value(json!({
+///     "s": [
+///         [0, false],
+///         [1, true]
+///     ]
+/// })).unwrap();
+///
+/// assert_eq!(2, v.s.len());
+/// assert_eq!(true, v.s[&1]);
+/// ```
+///
+/// [`serde_as`]: crate::guide::serde_as
+#[deprecated(
+    since = "1.8.0",
+    note = "Use the more general map_as_tuple_list module."
+)]
+pub mod hashmap_as_tuple_list {
+    #[doc(inline)]
+    #[deprecated(
+        since = "1.8.0",
+        note = "Use the more general map_as_tuple_list::deserialize function."
+    )]
+    pub use super::map_as_tuple_list::deserialize;
+    #[doc(inline)]
+    #[deprecated(
+        since = "1.8.0",
+        note = "Use the more general map_as_tuple_list::serialize function."
+    )]
+    pub use super::map_as_tuple_list::serialize;
+}
+
+/// DEPRECATED De/Serialize a [`BTreeMap`] into a list of tuples
+///
+/// Use the [`map_as_tuple_list`] module which is more general than this.
+/// It should work with everything convertible to and from an `Iterator` including [`BTreeMap`] and [`HashMap`].
+///
+/// ---
+///
+/// Some formats, like JSON, have limitations on the type of keys for maps.
+/// In case of JSON, keys are restricted to strings.
+/// Rust features more powerful keys, for example tuple, which can not be serialized to JSON.
+///
+/// This helper serializes the [`BTreeMap`] into a list of tuples, which does not have the same type restrictions.
+///
+/// If you need to de/serialize a [`HashMap`] then use [`hashmap_as_tuple_list`].
+///
+/// ## Converting to `serde_as`
+///
+/// The same functionality can be more clearly expressed using the [`serde_as`] macro.
+/// The `_` is a placeholder which works for any type which implements [`Serialize`]/[`Deserialize`], such as the tuple and `u32` type.
+///
+/// ```rust
+/// # #[cfg(feature = "macros")] {
+/// # use serde::{Deserialize, Serialize};
+/// # use serde_with::serde_as;
+/// # use std::collections::BTreeMap;
+/// #
+/// #[serde_as]
+/// #[derive(Deserialize, Serialize)]
+/// struct A {
+///     #[serde_as(as = "Vec<(_, _)>")]
+///     s: BTreeMap<(String, u32), u32>,
+/// }
+/// # }
+/// ```
+///
+/// # Examples
+///
+/// ```
+/// # use serde::{Deserialize, Serialize};
+/// # use serde_json::json;
+/// # use std::collections::BTreeMap;
+/// #
+/// #[derive(Deserialize, Serialize)]
+/// struct A {
+///     #[serde(with = "serde_with::rust::btreemap_as_tuple_list")]
+///     s: BTreeMap<(String, u32), u32>,
+/// }
+///
+/// let v: A = serde_json::from_value(json!({
+///     "s": [
+///         [["Hello", 123], 0],
+///         [["World", 456], 1]
+///     ]
+/// })).unwrap();
+///
+/// assert_eq!(2, v.s.len());
+/// assert_eq!(1, v.s[&("World".to_string(), 456)]);
+/// ```
+///
+/// [`serde_as`]: crate::guide::serde_as
+#[deprecated(
+    since = "1.8.0",
+    note = "Use the more general map_as_tuple_list module."
+)]
+pub mod btreemap_as_tuple_list {
+    #[doc(inline)]
+    #[deprecated(
+        since = "1.8.0",
+        note = "Use the more general map_as_tuple_list::deserialize function."
+    )]
+    pub use super::map_as_tuple_list::deserialize;
+    #[doc(inline)]
+    #[deprecated(
+        since = "1.8.0",
+        note = "Use the more general map_as_tuple_list::serialize function."
+    )]
+    pub use super::map_as_tuple_list::serialize;
+}
+
+/// This serializes a list of tuples into a map and back
+///
+/// Normally, you want to use a [`HashMap`] or a [`BTreeMap`] when deserializing a map.
+/// However, sometimes this is not possible due to type contains, e.g., if the type implements neither [`Hash`] nor [`Ord`].
+/// Another use case is deserializing a map with duplicate keys.
+///
+/// The implementation is generic using the [`FromIterator`] and [`IntoIterator`] traits.
+/// Therefore, all of [`Vec`], [`VecDeque`](std::collections::VecDeque), and [`LinkedList`](std::collections::LinkedList) and anything which implements those are supported.
+///
+/// ## Converting to `serde_as`
+///
+/// The same functionality can be more clearly expressed using the [`serde_as`] macro.
+/// The `_` is a placeholder which works for any type which implements [`Serialize`]/[`Deserialize`], such as the tuple and `u32` type.
+///
+/// ```rust
+/// # #[cfg(feature = "macros")] {
+/// # use serde::{Deserialize, Serialize};
+/// # use serde_with::serde_as;
+/// # use std::collections::BTreeMap;
+/// #
+/// #[serde_as]
+/// #[derive(Deserialize, Serialize)]
+/// struct S {
+///     #[serde_as(as = "BTreeMap<_, _>")] // HashMap will also work
+///     s: Vec<(i32, String)>,
+/// }
+/// # }
+/// ```
+///
+/// # Examples
+///
+/// `Wrapper` does not implement [`Hash`] nor [`Ord`], thus prohibiting the use [`HashMap`] or [`BTreeMap`].
+///
+/// ```
+/// # use serde::{Deserialize, Serialize};
+/// #
+/// #[derive(Debug, Deserialize, Serialize, Default)]
+/// struct S {
+///     #[serde(with = "serde_with::rust::tuple_list_as_map")]
+///     s: Vec<(Wrapper<i32>, Wrapper<String>)>,
+/// }
+///
+/// #[derive(Clone, Debug, Serialize, Deserialize)]
+/// #[serde(transparent)]
+/// struct Wrapper<T>(T);
+///
+/// let from = r#"{
+///   "s": {
+///     "1": "Hi",
+///     "2": "Cake",
+///     "99": "Lie"
+///   }
+/// }"#;
+/// let mut expected = S::default();
+/// expected.s.push((Wrapper(1), Wrapper("Hi".into())));
+/// expected.s.push((Wrapper(2), Wrapper("Cake".into())));
+/// expected.s.push((Wrapper(99), Wrapper("Lie".into())));
+///
+/// let res: S = serde_json::from_str(from).unwrap();
+/// for ((exp_k, exp_v), (res_k, res_v)) in expected.s.iter().zip(&res.s) {
+///     assert_eq!(exp_k.0, res_k.0);
+///     assert_eq!(exp_v.0, res_v.0);
+/// }
+/// assert_eq!(from, serde_json::to_string_pretty(&expected).unwrap());
+/// ```
+///
+/// In this example, the serialized format contains duplicate keys, which is not supported with [`HashMap`] or [`BTreeMap`].
+///
+/// ```
+/// # use serde::{Deserialize, Serialize};
+/// #
+/// #[derive(Debug, Deserialize, Serialize, PartialEq, Default)]
+/// struct S {
+///     #[serde(with = "serde_with::rust::tuple_list_as_map")]
+///     s: Vec<(i32, String)>,
+/// }
+///
+/// let from = r#"{
+///   "s": {
+///     "1": "Hi",
+///     "1": "Cake",
+///     "1": "Lie"
+///   }
+/// }"#;
+/// let mut expected = S::default();
+/// expected.s.push((1, "Hi".into()));
+/// expected.s.push((1, "Cake".into()));
+/// expected.s.push((1, "Lie".into()));
+///
+/// let res: S = serde_json::from_str(from).unwrap();
+/// assert_eq!(3, res.s.len());
+/// assert_eq!(expected, res);
+/// assert_eq!(from, serde_json::to_string_pretty(&expected).unwrap());
+/// ```
+///
+/// [`serde_as`]: crate::guide::serde_as
+pub mod tuple_list_as_map {
+    use super::*;
+
+    /// Serialize any iteration of tuples into a map.
+    pub fn serialize<'a, I, K, V, S>(iter: I, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        I: IntoIterator<Item = &'a (K, V)>,
+        I::IntoIter: ExactSizeIterator,
+        K: Serialize + 'a,
+        V: Serialize + 'a,
+        S: Serializer,
+    {
+        // Convert &(K, V) to (&K, &V) for collect_map.
+        let iter = iter.into_iter().map(|(k, v)| (k, v));
+        serializer.collect_map(iter)
+    }
+
+    /// Deserialize a map into an iterator of tuples.
+    pub fn deserialize<'de, I, K, V, D>(deserializer: D) -> Result<I, D::Error>
+    where
+        I: FromIterator<(K, V)>,
+        K: Deserialize<'de>,
+        V: Deserialize<'de>,
+        D: Deserializer<'de>,
+    {
+        deserializer.deserialize_map(MapVisitor(PhantomData))
+    }
+
+    #[allow(clippy::type_complexity)]
+    struct MapVisitor<I, K, V>(PhantomData<fn() -> (I, K, V)>);
+
+    impl<'de, I, K, V> Visitor<'de> for MapVisitor<I, K, V>
+    where
+        I: FromIterator<(K, V)>,
+        K: Deserialize<'de>,
+        V: Deserialize<'de>,
+    {
+        type Value = I;
+
+        fn expecting(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
+            formatter.write_str("a map")
+        }
+
+        fn visit_map<A>(self, map: A) -> Result<Self::Value, A::Error>
+        where
+            A: MapAccess<'de>,
+        {
+            utils::MapIter::new(map).collect()
+        }
+    }
+}
+
+/// Deserialize from bytes or string
+///
+/// Any Rust [`String`] can be converted into bytes, i.e., `Vec<u8>`.
+/// Accepting both as formats while deserializing can be helpful while interacting with language
+/// which have a looser definition of string than Rust.
+///
+/// ## Converting to `serde_as`
+///
+/// The same functionality can be more clearly expressed via [`BytesOrString`] and using the [`serde_as`] macro.
+///
+/// ```rust
+/// # #[cfg(feature = "macros")] {
+/// # use serde::Deserialize;
+/// # use serde_with::{serde_as, BytesOrString};
+/// #
+/// #[serde_as]
+/// #[derive(Deserialize)]
+/// struct A {
+///     #[serde_as(as = "BytesOrString")]
+///     bos: Vec<u8>,
+/// }
+/// # }
+/// ```
+///
+/// # Example
+/// ```rust
+/// # use serde::{Deserialize, Serialize};
+/// #
+/// #[derive(Debug, Deserialize, Serialize, PartialEq, Default)]
+/// struct S {
+///     #[serde(deserialize_with = "serde_with::rust::bytes_or_string::deserialize")]
+///     bos: Vec<u8>,
+/// }
+///
+/// // Here we deserialize from a byte array ...
+/// let from = r#"{
+///   "bos": [
+///     0,
+///     1,
+///     2,
+///     3
+///   ]
+/// }"#;
+/// let expected = S {
+///     bos: vec![0, 1, 2, 3],
+/// };
+///
+/// let res: S = serde_json::from_str(from).unwrap();
+/// assert_eq!(expected, res);
+///
+/// // and serialization works too.
+/// assert_eq!(from, serde_json::to_string_pretty(&expected).unwrap());
+///
+/// // But we also support deserializing from a String
+/// let from = r#"{
+///   "bos": "✨Works!"
+/// }"#;
+/// let expected = S {
+///     bos: "✨Works!".as_bytes().to_vec(),
+/// };
+///
+/// let res: S = serde_json::from_str(from).unwrap();
+/// assert_eq!(expected, res);
+/// ```
+///
+/// [`BytesOrString`]: crate::BytesOrString
+/// [`serde_as`]: crate::guide::serde_as
+pub mod bytes_or_string {
+    use super::*;
+
+    /// Deserialize a [`Vec<u8>`] from either bytes or string
+    pub fn deserialize<'de, D>(deserializer: D) -> Result<Vec<u8>, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        deserializer.deserialize_any(BytesOrStringVisitor)
+    }
+
+    struct BytesOrStringVisitor;
+
+    impl<'de> Visitor<'de> for BytesOrStringVisitor {
+        type Value = Vec<u8>;
+
+        fn expecting(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
+            formatter.write_str("a list of bytes or a string")
+        }
+
+        fn visit_bytes<E>(self, v: &[u8]) -> Result<Self::Value, E> {
+            Ok(v.to_vec())
+        }
+
+        fn visit_byte_buf<E>(self, v: Vec<u8>) -> Result<Self::Value, E> {
+            Ok(v)
+        }
+
+        fn visit_str<E>(self, v: &str) -> Result<Self::Value, E> {
+            Ok(v.as_bytes().to_vec())
+        }
+
+        fn visit_string<E>(self, v: String) -> Result<Self::Value, E> {
+            Ok(v.into_bytes())
+        }
+
+        fn visit_seq<A>(self, seq: A) -> Result<Self::Value, A::Error>
+        where
+            A: SeqAccess<'de>,
+        {
+            utils::SeqIter::new(seq).collect()
+        }
+    }
+}
+
+/// Deserialize value and return [`Default`] on error
+///
+/// The main use case is ignoring error while deserializing.
+/// Instead of erroring, it simply deserializes the [`Default`] variant of the type.
+/// It is not possible to find the error location, i.e., which field had a deserialization error, with this method.
+///
+/// ## Converting to `serde_as`
+///
+/// The same functionality can be more clearly expressed via [`DefaultOnError`] and using the [`serde_as`] macro.
+/// It can be combined with other converts as shown.
+///
+/// ```rust
+/// # #[cfg(feature = "macros")] {
+/// # use serde::Deserialize;
+/// # use serde_with::{serde_as, DefaultOnError, DisplayFromStr};
+/// #
+/// #[serde_as]
+/// #[derive(Deserialize)]
+/// struct A {
+///     #[serde_as(as = "DefaultOnError")]
+///     value: u32,
+///     #[serde_as(as = "DefaultOnError<DisplayFromStr>")]
+///     value2: u32,
+/// }
+/// # }
+/// ```
+///
+/// [`DefaultOnError`]: crate::DefaultOnError
+/// [`serde_as`]: crate::guide::serde_as
+///
+/// # Examples
+///
+/// ```
+/// # use serde::Deserialize;
+/// #
+/// #[derive(Deserialize)]
+/// struct A {
+///     #[serde(deserialize_with = "serde_with::rust::default_on_error::deserialize")]
+///     value: u32,
+/// }
+///
+/// let a: A = serde_json::from_str(r#"{"value": 123}"#).unwrap();
+/// assert_eq!(123, a.value);
+///
+/// // null is of invalid type
+/// let a: A = serde_json::from_str(r#"{"value": null}"#).unwrap();
+/// assert_eq!(0, a.value);
+///
+/// // String is of invalid type
+/// let a: A = serde_json::from_str(r#"{"value": "123"}"#).unwrap();
+/// assert_eq!(0, a.value);
+///
+/// // Map is of invalid type
+/// let a: A = serde_json::from_str(r#"{"value": {}}"#).unwrap();
+/// assert_eq!(0, a.value);
+///
+/// // Missing entries still cause errors
+/// assert!(serde_json::from_str::<A>(r#"{  }"#).is_err());
+/// ```
+///
+/// Deserializing missing values can be supported by adding the `default` field attribute:
+///
+/// ```
+/// # use serde::Deserialize;
+/// #
+/// #[derive(Deserialize)]
+/// struct B {
+///     #[serde(default, deserialize_with = "serde_with::rust::default_on_error::deserialize")]
+///     value: u32,
+/// }
+///
+/// let b: B = serde_json::from_str(r#"{  }"#).unwrap();
+/// assert_eq!(0, b.value);
+/// ```
+pub mod default_on_error {
+    use super::*;
+
+    /// Deserialize T and return the [`Default`] value on error
+    pub fn deserialize<'de, D, T>(deserializer: D) -> Result<T, D::Error>
+    where
+        D: Deserializer<'de>,
+        T: Deserialize<'de> + Default,
+    {
+        #[derive(Debug, serde::Deserialize)]
+        #[serde(untagged)]
+        enum GoodOrError<T> {
+            Good(T),
+            // This consumes one "item" when `T` errors while deserializing.
+            // This is necessary to make this work, when instead of having a direct value
+            // like integer or string, the deserializer sees a list or map.
+            Error(serde::de::IgnoredAny),
+        }
+
+        Ok(match Deserialize::deserialize(deserializer) {
+            Ok(GoodOrError::Good(res)) => res,
+            _ => Default::default(),
+        })
+    }
+
+    /// Serialize value with the default serializer
+    pub fn serialize<T, S>(value: &T, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        T: Serialize,
+        S: Serializer,
+    {
+        value.serialize(serializer)
+    }
+}
+
+/// Deserialize default value if encountering `null`.
+///
+/// One use case are JSON APIs in which the `null` value represents some default state.
+/// This adapter allows to turn the `null` directly into the [`Default`] value of the type.
+///
+/// ## Converting to `serde_as`
+///
+/// The same functionality can be more clearly expressed via [`DefaultOnNull`] and using the [`serde_as`] macro.
+/// It can be combined with other convertes as shown.
+///
+/// ```rust
+/// # #[cfg(feature = "macros")] {
+/// # use serde::Deserialize;
+/// # use serde_with::{serde_as, DefaultOnNull, DisplayFromStr};
+/// #
+/// #[serde_as]
+/// #[derive(Deserialize)]
+/// struct A {
+///     #[serde_as(as = "DefaultOnNull")]
+///     value: u32,
+///     #[serde_as(as = "DefaultOnNull<DisplayFromStr>")]
+///     value2: u32,
+/// }
+/// # }
+/// ```
+///
+/// [`DefaultOnNull`]: crate::DefaultOnNull
+/// [`serde_as`]: crate::guide::serde_as
+///
+/// # Examples
+///
+/// ```
+/// # use serde::Deserialize;
+/// #
+/// #[derive(Deserialize)]
+/// struct A {
+///     #[serde(deserialize_with = "serde_with::rust::default_on_null::deserialize")]
+///     value: u32,
+/// }
+///
+/// let a: A = serde_json::from_str(r#"{"value": 123}"#).unwrap();
+/// assert_eq!(123, a.value);
+///
+/// let a: A = serde_json::from_str(r#"{"value": null}"#).unwrap();
+/// assert_eq!(0, a.value);
+///
+/// // String is invalid type
+/// assert!(serde_json::from_str::<A>(r#"{"value": "123"}"#).is_err());
+/// ```
+pub mod default_on_null {
+    use super::*;
+
+    /// Deserialize T and return the [`Default`] value if original value is `null`
+    pub fn deserialize<'de, D, T>(deserializer: D) -> Result<T, D::Error>
+    where
+        D: Deserializer<'de>,
+        T: Deserialize<'de> + Default,
+    {
+        Ok(Option::deserialize(deserializer)?.unwrap_or_default())
+    }
+
+    /// Serialize value with the default serializer
+    pub fn serialize<T, S>(value: &T, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        T: Serialize,
+        S: Serializer,
+    {
+        value.serialize(serializer)
+    }
+}
+
+/// Deserialize any value, ignore it, and return the default value for the type being deserialized.
+///
+/// This function can be used in two different ways:
+///
+/// 1. It is useful for instance to create an enum with a catch-all variant that will accept any incoming data.
+/// 2. [`untagged`] enum representations do not allow the `other` annotation as the fallback enum variant.
+///     With this function you can emulate an `other` variant, which can deserialize any data carrying enum.
+///
+/// **Note:** Using this function will prevent deserializing data-less enum variants.
+/// If this is a problem depends on the data format.
+/// For example, deserializing `"Bar"` as an enum in JSON would fail, since it carries no data.
+///
+/// # Examples
+///
+/// ## Deserializing a heterogeneous collection of XML nodes
+///
+/// When [`serde-xml-rs`] deserializes an XML tag to an enum, it always maps the tag
+/// name to the enum variant name, and the tag attributes and children to the enum contents.
+/// This means that in order for an enum variant to accept any XML tag, it both has to use
+/// `#[serde(other)]` to accept any tag name, and `#[serde(deserialize_with = "deserialize_ignore_any")]`
+/// to accept any attributes and children.
+///
+/// ```rust
+/// # use serde::Deserialize;
+/// use serde_with::rust::deserialize_ignore_any;
+///
+/// # #[derive(Debug, PartialEq)]
+/// #[derive(Deserialize)]
+/// #[serde(rename_all = "lowercase")]
+/// enum Item {
+///     Foo(String),
+///     Bar(String),
+///     #[serde(other, deserialize_with = "deserialize_ignore_any")]
+///     Other,
+/// }
+///
+/// // Deserialize this XML
+/// # let items: Vec<Item> = serde_xml_rs::from_str(
+/// r"
+/// <foo>a</foo>
+/// <bar>b</bar>
+/// <foo>c</foo>
+/// <unknown>d</unknown>
+/// "
+/// # ).unwrap();
+///
+/// // into these Items
+/// # let expected =
+/// vec![
+///     Item::Foo(String::from("a")),
+///     Item::Bar(String::from("b")),
+///     Item::Foo(String::from("c")),
+///     Item::Other,
+/// ]
+/// # ;
+/// # assert_eq!(expected, items);
+/// ```
+///
+/// ## Simulating an `other` enum variant in an `untagged` enum
+///
+/// ```rust
+/// # use serde::Deserialize;
+/// # use serde_json::json;
+/// use serde_with::rust::deserialize_ignore_any;
+///
+/// # #[derive(Debug, PartialEq)]
+/// #[derive(Deserialize)]
+/// #[serde(untagged)]
+/// enum Item {
+///     Foo{x: u8},
+///     #[serde(deserialize_with = "deserialize_ignore_any")]
+///     Other,
+/// }
+///
+/// // Deserialize this JSON
+/// # let items: Vec<Item> = serde_json::from_value(
+/// json!([
+///     {"y": 1},
+///     {"x": 1},
+/// ])
+/// # ).unwrap();
+///
+/// // into these Items
+/// # let expected =
+/// vec![Item::Other, Item::Foo{x: 1}]
+/// # ;
+/// # assert_eq!(expected, items);
+/// ```
+///
+/// [`serde-xml-rs`]: https://docs.rs/serde-xml-rs
+/// [`untagged`]: https://serde.rs/enum-representations.html#untagged
+pub fn deserialize_ignore_any<'de, D: Deserializer<'de>, T: Default>(
+    deserializer: D,
+) -> Result<T, D::Error> {
+    serde::de::IgnoredAny::deserialize(deserializer).map(|_| T::default())
+}
diff --git a/third_party/rust/serde_with/src/ser/const_arrays.rs b/third_party/rust/serde_with/src/ser/const_arrays.rs
new file mode 100644
index 0000000000..b864f2b7e5
--- /dev/null
+++ b/third_party/rust/serde_with/src/ser/const_arrays.rs
@@ -0,0 +1,90 @@
+use super::*;
+use alloc::{borrow::Cow, boxed::Box, collections::BTreeMap};
+use std::collections::HashMap;
+
+impl<T, As, const N: usize> SerializeAs<[T; N]> for [As; N]
+where
+    As: SerializeAs<T>,
+{
+    fn serialize_as<S>(array: &[T; N], serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        use serde::ser::SerializeTuple;
+        let mut arr = serializer.serialize_tuple(N)?;
+        for elem in array {
+            arr.serialize_element(&SerializeAsWrap::<T, As>::new(elem))?;
+        }
+        arr.end()
+    }
+}
+
+macro_rules! tuple_seq_as_map_impl_intern {
+    ($tyorig:ty, $ty:ident <K, V>) => {
+        #[allow(clippy::implicit_hasher)]
+        impl<K, KAs, V, VAs, const N: usize> SerializeAs<$tyorig> for $ty<KAs, VAs>
+        where
+            KAs: SerializeAs<K>,
+            VAs: SerializeAs<V>,
+        {
+            fn serialize_as<S>(source: &$tyorig, serializer: S) -> Result<S::Ok, S::Error>
+            where
+                S: Serializer,
+            {
+                serializer.collect_map(source.iter().map(|(k, v)| {
+                    (
+                        SerializeAsWrap::<K, KAs>::new(k),
+                        SerializeAsWrap::<V, VAs>::new(v),
+                    )
+                }))
+            }
+        }
+    };
+}
+tuple_seq_as_map_impl_intern!([(K, V); N], BTreeMap<K, V>);
+tuple_seq_as_map_impl_intern!([(K, V); N], HashMap<K, V>);
+
+impl<const N: usize> SerializeAs<[u8; N]> for Bytes {
+    fn serialize_as<S>(bytes: &[u8; N], serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        serializer.serialize_bytes(bytes)
+    }
+}
+
+impl<const N: usize> SerializeAs<&[u8; N]> for Bytes {
+    fn serialize_as<S>(bytes: &&[u8; N], serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        serializer.serialize_bytes(*bytes)
+    }
+}
+
+impl<const N: usize> SerializeAs<Box<[u8; N]>> for Bytes {
+    fn serialize_as<S>(bytes: &Box<[u8; N]>, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        serializer.serialize_bytes(&**bytes)
+    }
+}
+
+impl<'a, const N: usize> SerializeAs<Cow<'a, [u8; N]>> for Bytes {
+    fn serialize_as<S>(bytes: &Cow<'a, [u8; N]>, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        serializer.serialize_bytes(bytes.as_ref())
+    }
+}
+
+impl<'a, const N: usize> SerializeAs<Cow<'a, [u8; N]>> for BorrowCow {
+    fn serialize_as<S>(value: &Cow<'a, [u8; N]>, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        serializer.collect_seq(value.iter())
+    }
+}
diff --git a/third_party/rust/serde_with/src/ser/impls.rs b/third_party/rust/serde_with/src/ser/impls.rs
new file mode 100644
index 0000000000..16a8fb913c
--- /dev/null
+++ b/third_party/rust/serde_with/src/ser/impls.rs
@@ -0,0 +1,739 @@
+use super::*;
+use crate::{
+    formats::Strictness, rust::StringWithSeparator, utils::duration::DurationSigned, Separator,
+};
+use alloc::{
+    borrow::Cow,
+    boxed::Box,
+    collections::{BTreeMap, BTreeSet, BinaryHeap, LinkedList, VecDeque},
+    rc::{Rc, Weak as RcWeak},
+    string::{String, ToString},
+    sync::{Arc, Weak as ArcWeak},
+    vec::Vec,
+};
+use core::{
+    cell::{Cell, RefCell},
+    convert::TryInto,
+    fmt::Display,
+    time::Duration,
+};
+#[cfg(feature = "indexmap")]
+use indexmap_crate::{IndexMap, IndexSet};
+use serde::ser::Error;
+use std::{
+    collections::{HashMap, HashSet},
+    sync::{Mutex, RwLock},
+    time::SystemTime,
+};
+
+///////////////////////////////////////////////////////////////////////////////
+// region: Simple Wrapper types (e.g., Box, Option)
+
+impl<'a, T, U> SerializeAs<&'a T> for &'a U
+where
+    U: SerializeAs<T>,
+    T: ?Sized,
+    U: ?Sized,
+{
+    fn serialize_as<S>(source: &&'a T, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        SerializeAsWrap::<T, U>::new(source).serialize(serializer)
+    }
+}
+
+impl<'a, T, U> SerializeAs<&'a mut T> for &'a mut U
+where
+    U: SerializeAs<T>,
+    T: ?Sized,
+    U: ?Sized,
+{
+    fn serialize_as<S>(source: &&'a mut T, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        SerializeAsWrap::<T, U>::new(source).serialize(serializer)
+    }
+}
+
+impl<T, U> SerializeAs<Box<T>> for Box<U>
+where
+    U: SerializeAs<T>,
+{
+    fn serialize_as<S>(source: &Box<T>, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        SerializeAsWrap::<T, U>::new(source).serialize(serializer)
+    }
+}
+
+impl<T, U> SerializeAs<Option<T>> for Option<U>
+where
+    U: SerializeAs<T>,
+{
+    fn serialize_as<S>(source: &Option<T>, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        match *source {
+            Some(ref value) => serializer.serialize_some(&SerializeAsWrap::<T, U>::new(value)),
+            None => serializer.serialize_none(),
+        }
+    }
+}
+
+impl<T, U> SerializeAs<Rc<T>> for Rc<U>
+where
+    U: SerializeAs<T>,
+{
+    fn serialize_as<S>(source: &Rc<T>, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        SerializeAsWrap::<T, U>::new(source).serialize(serializer)
+    }
+}
+
+impl<T, U> SerializeAs<RcWeak<T>> for RcWeak<U>
+where
+    U: SerializeAs<T>,
+{
+    fn serialize_as<S>(source: &RcWeak<T>, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        SerializeAsWrap::<Option<Rc<T>>, Option<Rc<U>>>::new(&source.upgrade())
+            .serialize(serializer)
+    }
+}
+
+impl<T, U> SerializeAs<Arc<T>> for Arc<U>
+where
+    U: SerializeAs<T>,
+{
+    fn serialize_as<S>(source: &Arc<T>, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        SerializeAsWrap::<T, U>::new(source).serialize(serializer)
+    }
+}
+
+impl<T, U> SerializeAs<ArcWeak<T>> for ArcWeak<U>
+where
+    U: SerializeAs<T>,
+{
+    fn serialize_as<S>(source: &ArcWeak<T>, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        SerializeAsWrap::<Option<Arc<T>>, Option<Arc<U>>>::new(&source.upgrade())
+            .serialize(serializer)
+    }
+}
+
+impl<T, U> SerializeAs<Cell<T>> for Cell<U>
+where
+    U: SerializeAs<T>,
+    T: Copy,
+{
+    fn serialize_as<S>(source: &Cell<T>, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        SerializeAsWrap::<T, U>::new(&source.get()).serialize(serializer)
+    }
+}
+
+impl<T, U> SerializeAs<RefCell<T>> for RefCell<U>
+where
+    U: SerializeAs<T>,
+{
+    fn serialize_as<S>(source: &RefCell<T>, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        match source.try_borrow() {
+            Ok(source) => SerializeAsWrap::<T, U>::new(&*source).serialize(serializer),
+            Err(_) => Err(S::Error::custom("already mutably borrowed")),
+        }
+    }
+}
+
+impl<T, U> SerializeAs<Mutex<T>> for Mutex<U>
+where
+    U: SerializeAs<T>,
+{
+    fn serialize_as<S>(source: &Mutex<T>, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        match source.lock() {
+            Ok(source) => SerializeAsWrap::<T, U>::new(&*source).serialize(serializer),
+            Err(_) => Err(S::Error::custom("lock poison error while serializing")),
+        }
+    }
+}
+
+impl<T, U> SerializeAs<RwLock<T>> for RwLock<U>
+where
+    U: SerializeAs<T>,
+{
+    fn serialize_as<S>(source: &RwLock<T>, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        match source.read() {
+            Ok(source) => SerializeAsWrap::<T, U>::new(&*source).serialize(serializer),
+            Err(_) => Err(S::Error::custom("lock poison error while serializing")),
+        }
+    }
+}
+
+impl<T, TAs, E, EAs> SerializeAs<Result<T, E>> for Result<TAs, EAs>
+where
+    TAs: SerializeAs<T>,
+    EAs: SerializeAs<E>,
+{
+    fn serialize_as<S>(source: &Result<T, E>, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        source
+            .as_ref()
+            .map(SerializeAsWrap::<T, TAs>::new)
+            .map_err(SerializeAsWrap::<E, EAs>::new)
+            .serialize(serializer)
+    }
+}
+
+// endregion
+///////////////////////////////////////////////////////////////////////////////
+// region: Collection Types (e.g., Maps, Sets, Vec)
+
+macro_rules! seq_impl {
+    ($ty:ident < T $(: $tbound1:ident $(+ $tbound2:ident)*)* $(, $typaram:ident : $bound:ident )* >) => {
+        impl<T, U $(, $typaram)*> SerializeAs<$ty<T $(, $typaram)*>> for $ty<U $(, $typaram)*>
+        where
+            U: SerializeAs<T>,
+            $(T: ?Sized + $tbound1 $(+ $tbound2)*,)*
+            $($typaram: ?Sized + $bound,)*
+        {
+            fn serialize_as<S>(source: &$ty<T $(, $typaram)*>, serializer: S) -> Result<S::Ok, S::Error>
+            where
+                S: Serializer,
+            {
+                serializer.collect_seq(source.iter().map(|item| SerializeAsWrap::<T, U>::new(item)))
+            }
+        }
+    }
+}
+
+type BoxedSlice<T> = Box<[T]>;
+type Slice<T> = [T];
+seq_impl!(BinaryHeap<T>);
+seq_impl!(BoxedSlice<T>);
+seq_impl!(BTreeSet<T>);
+seq_impl!(HashSet<T, H: Sized>);
+seq_impl!(LinkedList<T>);
+seq_impl!(Slice<T>);
+seq_impl!(Vec<T>);
+seq_impl!(VecDeque<T>);
+#[cfg(feature = "indexmap")]
+seq_impl!(IndexSet<T, H: Sized>);
+
+macro_rules! map_impl {
+    ($ty:ident < K $(: $kbound1:ident $(+ $kbound2:ident)*)*, V $(, $typaram:ident : $bound:ident)* >) => {
+        impl<K, KU, V, VU $(, $typaram)*> SerializeAs<$ty<K, V $(, $typaram)*>> for $ty<KU, VU $(, $typaram)*>
+        where
+            KU: SerializeAs<K>,
+            VU: SerializeAs<V>,
+            $(K: ?Sized + $kbound1 $(+ $kbound2)*,)*
+            $($typaram: ?Sized + $bound,)*
+        {
+            fn serialize_as<S>(source: &$ty<K, V $(, $typaram)*>, serializer: S) -> Result<S::Ok, S::Error>
+            where
+                S: Serializer,
+            {
+                serializer.collect_map(source.iter().map(|(k, v)| (SerializeAsWrap::<K, KU>::new(k), SerializeAsWrap::<V, VU>::new(v))))
+            }
+        }
+    }
+}
+
+map_impl!(BTreeMap<K, V>);
+map_impl!(HashMap<K, V, H: Sized>);
+#[cfg(feature = "indexmap")]
+map_impl!(IndexMap<K, V, H: Sized>);
+
+macro_rules! tuple_impl {
+    ($len:literal $($n:tt $t:ident $tas:ident)+) => {
+        impl<$($t, $tas,)+> SerializeAs<($($t,)+)> for ($($tas,)+)
+        where
+            $($tas: SerializeAs<$t>,)+
+        {
+            fn serialize_as<S>(tuple: &($($t,)+), serializer: S) -> Result<S::Ok, S::Error>
+            where
+                S: Serializer,
+            {
+                use serde::ser::SerializeTuple;
+                let mut tup = serializer.serialize_tuple($len)?;
+                $(
+                    tup.serialize_element(&SerializeAsWrap::<$t, $tas>::new(&tuple.$n))?;
+                )+
+                tup.end()
+            }
+        }
+    };
+}
+
+tuple_impl!(1 0 T0 As0);
+tuple_impl!(2 0 T0 As0 1 T1 As1);
+tuple_impl!(3 0 T0 As0 1 T1 As1 2 T2 As2);
+tuple_impl!(4 0 T0 As0 1 T1 As1 2 T2 As2 3 T3 As3);
+tuple_impl!(5 0 T0 As0 1 T1 As1 2 T2 As2 3 T3 As3 4 T4 As4);
+tuple_impl!(6 0 T0 As0 1 T1 As1 2 T2 As2 3 T3 As3 4 T4 As4 5 T5 As5);
+tuple_impl!(7 0 T0 As0 1 T1 As1 2 T2 As2 3 T3 As3 4 T4 As4 5 T5 As5 6 T6 As6);
+tuple_impl!(8 0 T0 As0 1 T1 As1 2 T2 As2 3 T3 As3 4 T4 As4 5 T5 As5 6 T6 As6 7 T7 As7);
+tuple_impl!(9 0 T0 As0 1 T1 As1 2 T2 As2 3 T3 As3 4 T4 As4 5 T5 As5 6 T6 As6 7 T7 As7 8 T8 As8);
+tuple_impl!(10 0 T0 As0 1 T1 As1 2 T2 As2 3 T3 As3 4 T4 As4 5 T5 As5 6 T6 As6 7 T7 As7 8 T8 As8 9 T9 As9);
+tuple_impl!(11 0 T0 As0 1 T1 As1 2 T2 As2 3 T3 As3 4 T4 As4 5 T5 As5 6 T6 As6 7 T7 As7 8 T8 As8 9 T9 As9 10 T10 As10);
+tuple_impl!(12 0 T0 As0 1 T1 As1 2 T2 As2 3 T3 As3 4 T4 As4 5 T5 As5 6 T6 As6 7 T7 As7 8 T8 As8 9 T9 As9 10 T10 As10 11 T11 As11);
+tuple_impl!(13 0 T0 As0 1 T1 As1 2 T2 As2 3 T3 As3 4 T4 As4 5 T5 As5 6 T6 As6 7 T7 As7 8 T8 As8 9 T9 As9 10 T10 As10 11 T11 As11 12 T12 As12);
+tuple_impl!(14 0 T0 As0 1 T1 As1 2 T2 As2 3 T3 As3 4 T4 As4 5 T5 As5 6 T6 As6 7 T7 As7 8 T8 As8 9 T9 As9 10 T10 As10 11 T11 As11 12 T12 As12 13 T13 As13);
+tuple_impl!(15 0 T0 As0 1 T1 As1 2 T2 As2 3 T3 As3 4 T4 As4 5 T5 As5 6 T6 As6 7 T7 As7 8 T8 As8 9 T9 As9 10 T10 As10 11 T11 As11 12 T12 As12 13 T13 As13 14 T14 As14);
+tuple_impl!(16 0 T0 As0 1 T1 As1 2 T2 As2 3 T3 As3 4 T4 As4 5 T5 As5 6 T6 As6 7 T7 As7 8 T8 As8 9 T9 As9 10 T10 As10 11 T11 As11 12 T12 As12 13 T13 As13 14 T14 As14 15 T15 As15);
+
+macro_rules! map_as_tuple_seq {
+    ($ty:ident < K $(: $kbound1:ident $(+ $kbound2:ident)*)*, V >) => {
+        impl<K, KAs, V, VAs> SerializeAs<$ty<K, V>> for Vec<(KAs, VAs)>
+        where
+            KAs: SerializeAs<K>,
+            VAs: SerializeAs<V>,
+        {
+            fn serialize_as<S>(source: &$ty<K, V>, serializer: S) -> Result<S::Ok, S::Error>
+            where
+                S: Serializer,
+            {
+                serializer.collect_seq(source.iter().map(|(k, v)| {
+                    (
+                        SerializeAsWrap::<K, KAs>::new(k),
+                        SerializeAsWrap::<V, VAs>::new(v),
+                    )
+                }))
+            }
+        }
+    };
+}
+map_as_tuple_seq!(BTreeMap<K, V>);
+// TODO HashMap with a custom hasher support would be better, but results in "unconstrained type parameter"
+map_as_tuple_seq!(HashMap<K, V>);
+#[cfg(feature = "indexmap")]
+map_as_tuple_seq!(IndexMap<K, V>);
+
+// endregion
+///////////////////////////////////////////////////////////////////////////////
+// region: Conversion types which cause different serialization behavior
+
+impl<T> SerializeAs<T> for Same
+where
+    T: Serialize + ?Sized,
+{
+    fn serialize_as<S>(source: &T, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        source.serialize(serializer)
+    }
+}
+
+impl<T> SerializeAs<T> for DisplayFromStr
+where
+    T: Display,
+{
+    fn serialize_as<S>(source: &T, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        crate::rust::display_fromstr::serialize(source, serializer)
+    }
+}
+
+impl<T, U> SerializeAs<Vec<T>> for VecSkipError<U>
+where
+    U: SerializeAs<T>,
+{
+    fn serialize_as<S>(source: &Vec<T>, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        Vec::<U>::serialize_as(source, serializer)
+    }
+}
+
+impl<AsRefStr> SerializeAs<Option<AsRefStr>> for NoneAsEmptyString
+where
+    AsRefStr: AsRef<str>,
+{
+    fn serialize_as<S>(source: &Option<AsRefStr>, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        crate::rust::string_empty_as_none::serialize(source, serializer)
+    }
+}
+
+macro_rules! tuple_seq_as_map_impl_intern {
+    ($tyorig:ty, $ty:ident <K, V>) => {
+        #[allow(clippy::implicit_hasher)]
+        impl<K, KAs, V, VAs> SerializeAs<$tyorig> for $ty<KAs, VAs>
+        where
+            KAs: SerializeAs<K>,
+            VAs: SerializeAs<V>,
+        {
+            fn serialize_as<S>(source: &$tyorig, serializer: S) -> Result<S::Ok, S::Error>
+            where
+                S: Serializer,
+            {
+                serializer.collect_map(source.iter().map(|(k, v)| {
+                    (
+                        SerializeAsWrap::<K, KAs>::new(k),
+                        SerializeAsWrap::<V, VAs>::new(v),
+                    )
+                }))
+            }
+        }
+    };
+}
+macro_rules! tuple_seq_as_map_impl {
+    ($($ty:ty $(,)?)+) => {$(
+        tuple_seq_as_map_impl_intern!($ty, BTreeMap<K, V>);
+        tuple_seq_as_map_impl_intern!($ty, HashMap<K, V>);
+    )+}
+}
+
+tuple_seq_as_map_impl! {
+    BinaryHeap<(K, V)>,
+    BTreeSet<(K, V)>,
+    LinkedList<(K, V)>,
+    Option<(K, V)>,
+    Vec<(K, V)>,
+    VecDeque<(K, V)>,
+}
+tuple_seq_as_map_impl!(HashSet<(K, V)>);
+#[cfg(feature = "indexmap")]
+tuple_seq_as_map_impl!(IndexSet<(K, V)>);
+
+impl<T, TAs> SerializeAs<T> for DefaultOnError<TAs>
+where
+    TAs: SerializeAs<T>,
+{
+    fn serialize_as<S>(source: &T, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        TAs::serialize_as(source, serializer)
+    }
+}
+
+impl SerializeAs<Vec<u8>> for BytesOrString {
+    fn serialize_as<S>(source: &Vec<u8>, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        source.serialize(serializer)
+    }
+}
+
+impl<SEPARATOR, I, T> SerializeAs<I> for StringWithSeparator<SEPARATOR, T>
+where
+    SEPARATOR: Separator,
+    for<'a> &'a I: IntoIterator<Item = &'a T>,
+    T: ToString,
+{
+    fn serialize_as<S>(source: &I, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        let mut s = String::new();
+        for v in source {
+            s.push_str(&*v.to_string());
+            s.push_str(SEPARATOR::separator());
+        }
+        serializer.serialize_str(if !s.is_empty() {
+            // remove trailing separator if present
+            &s[..s.len() - SEPARATOR::separator().len()]
+        } else {
+            &s[..]
+        })
+    }
+}
+
+macro_rules! use_signed_duration {
+    (
+        $main_trait:ident $internal_trait:ident =>
+        {
+            $ty:ty =>
+            $({
+                $format:ty, $strictness:ty =>
+                $($tbound:ident: $bound:ident $(,)?)*
+            })*
+        }
+    ) => {
+        $(
+            impl<$($tbound,)*> SerializeAs<$ty> for $main_trait<$format, $strictness>
+            where
+                $($tbound: $bound,)*
+            {
+                fn serialize_as<S>(source: &$ty, serializer: S) -> Result<S::Ok, S::Error>
+                where
+                    S: Serializer,
+                {
+                    $internal_trait::<$format, $strictness>::serialize_as(
+                        &DurationSigned::from(source),
+                        serializer,
+                    )
+                }
+            }
+        )*
+    };
+    (
+        $( $main_trait:ident $internal_trait:ident, )+ => $rest:tt
+    ) => {
+        $( use_signed_duration!($main_trait $internal_trait => $rest); )+
+    };
+}
+
+use_signed_duration!(
+    DurationSeconds DurationSeconds,
+    DurationMilliSeconds DurationMilliSeconds,
+    DurationMicroSeconds DurationMicroSeconds,
+    DurationNanoSeconds DurationNanoSeconds,
+    => {
+        Duration =>
+        {u64, STRICTNESS => STRICTNESS: Strictness}
+        {f64, STRICTNESS => STRICTNESS: Strictness}
+        {String, STRICTNESS => STRICTNESS: Strictness}
+    }
+);
+use_signed_duration!(
+    DurationSecondsWithFrac DurationSecondsWithFrac,
+    DurationMilliSecondsWithFrac DurationMilliSecondsWithFrac,
+    DurationMicroSecondsWithFrac DurationMicroSecondsWithFrac,
+    DurationNanoSecondsWithFrac DurationNanoSecondsWithFrac,
+    => {
+        Duration =>
+        {f64, STRICTNESS => STRICTNESS: Strictness}
+        {String, STRICTNESS => STRICTNESS: Strictness}
+    }
+);
+
+use_signed_duration!(
+    TimestampSeconds DurationSeconds,
+    TimestampMilliSeconds DurationMilliSeconds,
+    TimestampMicroSeconds DurationMicroSeconds,
+    TimestampNanoSeconds DurationNanoSeconds,
+    => {
+        SystemTime =>
+        {i64, STRICTNESS => STRICTNESS: Strictness}
+        {f64, STRICTNESS => STRICTNESS: Strictness}
+        {String, STRICTNESS => STRICTNESS: Strictness}
+    }
+);
+use_signed_duration!(
+    TimestampSecondsWithFrac DurationSecondsWithFrac,
+    TimestampMilliSecondsWithFrac DurationMilliSecondsWithFrac,
+    TimestampMicroSecondsWithFrac DurationMicroSecondsWithFrac,
+    TimestampNanoSecondsWithFrac DurationNanoSecondsWithFrac,
+    => {
+        SystemTime =>
+        {f64, STRICTNESS => STRICTNESS: Strictness}
+        {String, STRICTNESS => STRICTNESS: Strictness}
+    }
+);
+
+impl<T, U> SerializeAs<T> for DefaultOnNull<U>
+where
+    U: SerializeAs<T>,
+{
+    fn serialize_as<S>(source: &T, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        serializer.serialize_some(&SerializeAsWrap::<T, U>::new(source))
+    }
+}
+
+impl SerializeAs<&[u8]> for Bytes {
+    fn serialize_as<S>(bytes: &&[u8], serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        serializer.serialize_bytes(bytes)
+    }
+}
+
+impl SerializeAs<Vec<u8>> for Bytes {
+    fn serialize_as<S>(bytes: &Vec<u8>, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        serializer.serialize_bytes(bytes)
+    }
+}
+
+impl SerializeAs<Box<[u8]>> for Bytes {
+    fn serialize_as<S>(bytes: &Box<[u8]>, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        serializer.serialize_bytes(bytes)
+    }
+}
+
+impl<'a> SerializeAs<Cow<'a, [u8]>> for Bytes {
+    fn serialize_as<S>(bytes: &Cow<'a, [u8]>, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        serializer.serialize_bytes(bytes)
+    }
+}
+
+impl<T, U> SerializeAs<Vec<T>> for OneOrMany<U, formats::PreferOne>
+where
+    U: SerializeAs<T>,
+{
+    fn serialize_as<S>(source: &Vec<T>, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        match source.len() {
+            1 => SerializeAsWrap::<T, U>::new(source.iter().next().expect("Cannot be empty"))
+                .serialize(serializer),
+            _ => SerializeAsWrap::<Vec<T>, Vec<U>>::new(source).serialize(serializer),
+        }
+    }
+}
+
+impl<T, U> SerializeAs<Vec<T>> for OneOrMany<U, formats::PreferMany>
+where
+    U: SerializeAs<T>,
+{
+    fn serialize_as<S>(source: &Vec<T>, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        SerializeAsWrap::<Vec<T>, Vec<U>>::new(source).serialize(serializer)
+    }
+}
+
+impl<T, TAs1> SerializeAs<T> for PickFirst<(TAs1,)>
+where
+    TAs1: SerializeAs<T>,
+{
+    fn serialize_as<S>(source: &T, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        SerializeAsWrap::<T, TAs1>::new(source).serialize(serializer)
+    }
+}
+
+impl<T, TAs1, TAs2> SerializeAs<T> for PickFirst<(TAs1, TAs2)>
+where
+    TAs1: SerializeAs<T>,
+{
+    fn serialize_as<S>(source: &T, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        SerializeAsWrap::<T, TAs1>::new(source).serialize(serializer)
+    }
+}
+
+impl<T, TAs1, TAs2, TAs3> SerializeAs<T> for PickFirst<(TAs1, TAs2, TAs3)>
+where
+    TAs1: SerializeAs<T>,
+{
+    fn serialize_as<S>(source: &T, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        SerializeAsWrap::<T, TAs1>::new(source).serialize(serializer)
+    }
+}
+
+impl<T, TAs1, TAs2, TAs3, TAs4> SerializeAs<T> for PickFirst<(TAs1, TAs2, TAs3, TAs4)>
+where
+    TAs1: SerializeAs<T>,
+{
+    fn serialize_as<S>(source: &T, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        SerializeAsWrap::<T, TAs1>::new(source).serialize(serializer)
+    }
+}
+
+impl<T, U> SerializeAs<T> for FromInto<U>
+where
+    T: Into<U> + Clone,
+    U: Serialize,
+{
+    fn serialize_as<S>(source: &T, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        source.clone().into().serialize(serializer)
+    }
+}
+
+impl<T, U> SerializeAs<T> for TryFromInto<U>
+where
+    T: TryInto<U> + Clone,
+    <T as TryInto<U>>::Error: Display,
+    U: Serialize,
+{
+    fn serialize_as<S>(source: &T, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        source
+            .clone()
+            .try_into()
+            .map_err(S::Error::custom)?
+            .serialize(serializer)
+    }
+}
+
+impl<'a> SerializeAs<Cow<'a, str>> for BorrowCow {
+    fn serialize_as<S>(source: &Cow<'a, str>, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        serializer.serialize_str(source)
+    }
+}
+
+impl<'a> SerializeAs<Cow<'a, [u8]>> for BorrowCow {
+    fn serialize_as<S>(value: &Cow<'a, [u8]>, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        serializer.collect_seq(value.iter())
+    }
+}
+
+impl<STRICTNESS: Strictness> SerializeAs<bool> for BoolFromInt<STRICTNESS> {
+    fn serialize_as<S>(source: &bool, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        serializer.serialize_u8(*source as u8)
+    }
+}
+
+// endregion
diff --git a/third_party/rust/serde_with/src/ser/legacy_arrays.rs b/third_party/rust/serde_with/src/ser/legacy_arrays.rs
new file mode 100644
index 0000000000..2c228ee640
--- /dev/null
+++ b/third_party/rust/serde_with/src/ser/legacy_arrays.rs
@@ -0,0 +1,34 @@
+use super::*;
+use alloc::collections::BTreeMap;
+use std::collections::HashMap;
+
+macro_rules! array_impl {
+    ($($len:literal)+) => {$(
+        impl<T, As> SerializeAs<[T; $len]> for [As; $len]
+        where
+            As: SerializeAs<T>,
+        {
+            fn serialize_as<S>(array: &[T; $len], serializer: S) -> Result<S::Ok, S::Error>
+            where
+                S: Serializer,
+            {
+                use serde::ser::SerializeTuple;
+                let mut arr = serializer.serialize_tuple($len)?;
+                for elem in array {
+                    arr.serialize_element(&SerializeAsWrap::<T, As>::new(elem))?;
+                }
+                arr.end()
+            }
+        }
+    )+};
+}
+
+array_impl!(0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32);
+
+tuple_seq_as_map_impl! {
+    [(K, V); 0], [(K, V); 1], [(K, V); 2], [(K, V); 3], [(K, V); 4], [(K, V); 5], [(K, V); 6],
+    [(K, V); 7], [(K, V); 8], [(K, V); 9], [(K, V); 10], [(K, V); 11], [(K, V); 12], [(K, V); 13],
+    [(K, V); 14], [(K, V); 15], [(K, V); 16], [(K, V); 17], [(K, V); 18], [(K, V); 19], [(K, V); 20],
+    [(K, V); 21], [(K, V); 22], [(K, V); 23], [(K, V); 24], [(K, V); 25], [(K, V); 26], [(K, V); 27],
+    [(K, V); 28], [(K, V); 29], [(K, V); 30], [(K, V); 31], [(K, V); 32],
+}
diff --git a/third_party/rust/serde_with/src/ser/mod.rs b/third_party/rust/serde_with/src/ser/mod.rs
new file mode 100644
index 0000000000..dda0891e89
--- /dev/null
+++ b/third_party/rust/serde_with/src/ser/mod.rs
@@ -0,0 +1,158 @@
+//! Module for [`SerializeAs`][] implementations
+//!
+//! The module contains the [`SerializeAs`][] trait and helper code.
+//! Additionally, it contains implementations of [`SerializeAs`][] for types defined in the Rust Standard Library or this crate.
+//!
+//! You can find more details on how to implement this trait for your types in the documentation of the [`SerializeAs`][] trait and details about the usage in the [user guide][].
+//!
+//! [user guide]: crate::guide
+
+mod const_arrays;
+#[macro_use]
+mod impls;
+
+use super::*;
+
+/// A **data structure** that can be serialized into any data format supported by Serde, analogue to [`Serialize`].
+///
+/// The trait is analogue to the [`serde::Serialize`][`Serialize`] trait, with the same meaning of input and output arguments.
+/// It can and should the implemented using the same code structure as the [`Serialize`] trait.
+/// As such, the same advice for [implementing `Serialize`][impl-serialize] applies here.
+///
+/// # Differences to [`Serialize`]
+///
+/// The trait is only required for container-like types or types implementing specific conversion functions.
+/// Container-like types are [`Vec`], [`BTreeMap`], but also [`Option`] and [`Box`].
+/// Conversion types serialize into a different serde data type.
+/// For example, [`DisplayFromStr`] uses the [`Display`] trait to serialize a String and [`DurationSeconds`] converts a [`Duration`] into either String or integer values.
+///
+/// This code shows how to implement [`Serialize`] for [`Box`]:
+///
+/// ```rust,ignore
+/// impl<T> Serialize for Box<T>
+/// where
+///     T: Serialize,
+/// {
+///     #[inline]
+///     fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+///     where
+///         S: Serializer,
+///     {
+///         (**self).serialize(serializer)
+///     }
+/// }
+/// ```
+///
+/// and this code shows how to do the same using [`SerializeAs`][]:
+///
+/// ```rust,ignore
+/// impl<T, U> SerializeAs<Box<T>> for Box<U>
+/// where
+///     U: SerializeAs<T>,
+/// {
+///     fn serialize_as<S>(source: &Box<T>, serializer: S) -> Result<S::Ok, S::Error>
+///     where
+///         S: Serializer,
+///     {
+///         SerializeAsWrap::<T, U>::new(source).serialize(serializer)
+///     }
+/// }
+/// ```
+///
+/// It uses two type parameters, `T` and `U` instead of only one and performs the serialization step using the `SerializeAsWrap` type.
+/// The `T` type is the on the Rust side before serialization, whereas the `U` type determines how the value will be serialized.
+/// These two changes are usually enough to make a container type implement [`SerializeAs`][].
+///
+/// [`SerializeAsWrap`] is a piece of glue code which turns [`SerializeAs`] into a serde compatible datatype, by converting all calls to `serialize` into `serialize_as`.
+/// This allows us to implement [`SerializeAs`] such that it can be applied recursively throughout the whole data structure.
+/// This is mostly important for container types, such as `Vec` or `BTreeMap`.
+/// In a `BTreeMap` this allows us to specify two different serialization behaviors, one for key and one for value, using the [`SerializeAs`] trait.
+///
+/// ## Implementing a converter Type
+///
+/// This shows a simplified implementation for [`DisplayFromStr`].
+///
+/// ```rust
+/// # #[cfg(all(feature = "macros"))] {
+/// # use serde_with::SerializeAs;
+/// # use std::fmt::Display;
+/// struct DisplayFromStr;
+///
+/// impl<T> SerializeAs<T> for DisplayFromStr
+/// where
+///     T: Display,
+/// {
+///     fn serialize_as<S>(source: &T, serializer: S) -> Result<S::Ok, S::Error>
+///     where
+///         S: serde::Serializer,
+///     {
+///         serializer.collect_str(&source)
+///     }
+/// }
+/// #
+/// # #[serde_with::serde_as]
+/// # #[derive(serde::Serialize)]
+/// # struct S (#[serde_as(as = "DisplayFromStr")] bool);
+/// #
+/// # assert_eq!(r#""false""#, serde_json::to_string(&S(false)).unwrap());
+/// # }
+/// ```
+///
+/// [`Box`]: std::boxed::Box
+/// [`BTreeMap`]: std::collections::BTreeMap
+/// [`Display`]: std::fmt::Display
+/// [`Duration`]: std::time::Duration
+/// [`Vec`]: std::vec::Vec
+/// [impl-serialize]: https://serde.rs/impl-serialize.html
+pub trait SerializeAs<T: ?Sized> {
+    /// Serialize this value into the given Serde serializer.
+    fn serialize_as<S>(source: &T, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer;
+}
+
+/// Helper type to implement [`SerializeAs`] for container-like types.
+#[derive(Debug)]
+pub struct SerializeAsWrap<'a, T: ?Sized, U: ?Sized> {
+    value: &'a T,
+    marker: PhantomData<U>,
+}
+
+impl<'a, T, U> SerializeAsWrap<'a, T, U>
+where
+    T: ?Sized,
+    U: ?Sized,
+{
+    /// Create new instance with provided value.
+    pub fn new(value: &'a T) -> Self {
+        Self {
+            value,
+            marker: PhantomData,
+        }
+    }
+}
+
+impl<'a, T, U> Serialize for SerializeAsWrap<'a, T, U>
+where
+    T: ?Sized,
+    U: ?Sized,
+    U: SerializeAs<T>,
+{
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        U::serialize_as(self.value, serializer)
+    }
+}
+
+impl<'a, T, U> From<&'a T> for SerializeAsWrap<'a, T, U>
+where
+    T: ?Sized,
+    U: ?Sized,
+    U: SerializeAs<T>,
+{
+    fn from(value: &'a T) -> Self {
+        Self::new(value)
+    }
+}
diff --git a/third_party/rust/serde_with/src/serde_conv.rs b/third_party/rust/serde_with/src/serde_conv.rs
new file mode 100644
index 0000000000..c5659ebfda
--- /dev/null
+++ b/third_party/rust/serde_with/src/serde_conv.rs
@@ -0,0 +1,147 @@
+/// Create new conversion adapters from functions
+///
+/// The macro lets you create a new converter, which is usable for serde's with-attribute and `#[serde_as]`.
+/// Its main use case is to write simple converters for types, which are not serializable.
+/// Another use-case is to change the serialization behavior if the implemented `Serialize`/`Deserialize` trait is insufficient.
+///
+/// The macro takes four arguments:
+///
+/// 1. The name of the converter type.
+///     The type can be prefixed with a visibility modifies like `pub` or `pub(crate)`.
+///     By default, the type is not marked as public (`pub(self)`).
+/// 2. The type `T` we want to extend with custom behavior.
+/// 3. A function or macro taking a `&T` and returning a serializable type.
+/// 4. A function or macro taking a deserializable type and returning a `Result<T, E>`.
+///     The error type `E` must implement `Display`.
+///
+/// # Example
+///
+/// In this example, we write custom serialization behavior for a `Rgb` type.
+/// We want to serialize it as a `[u8; 3]`.
+///
+/// ```rust
+/// # #[cfg(feature = "macros")] {
+/// # use serde::{Serialize, Deserialize};
+///
+/// #[derive(Clone, Copy, Debug, PartialEq)]
+/// struct Rgb {
+///     red: u8,
+///     green: u8,
+///     blue: u8,
+/// }
+///
+/// serde_with::serde_conv!(
+///     RgbAsArray,
+///     Rgb,
+///     |rgb: &Rgb| [rgb.red, rgb.green, rgb.blue],
+///     |value: [u8; 3]| -> Result<_, std::convert::Infallible> {
+///         Ok(Rgb {
+///             red: value[0],
+///             green: value[1],
+///             blue: value[2],
+///         })
+///     }
+/// );
+///
+/// //////////////////////////////////////////////////
+///
+/// // We define some colors to be used later
+///
+/// let green = Rgb {red: 0, green: 255, blue: 0};
+/// let orange = Rgb {red: 255, green: 128, blue: 0};
+/// let pink = Rgb {red: 255, green: 0, blue: 255};
+///
+/// //////////////////////////////////////////////////
+///
+/// // We can now use the `RgbAsArray` adapter with `serde_as`.
+///
+/// #[serde_with::serde_as]
+/// #[derive(Debug, PartialEq, Serialize, Deserialize)]
+/// struct Colors {
+///     #[serde_as(as = "RgbAsArray")]
+///     one_rgb: Rgb,
+///     #[serde_as(as = "Vec<RgbAsArray>")]
+///     rgbs_in_vec: Vec<Rgb>,
+/// }
+///
+/// let data = Colors {
+///     one_rgb: orange,
+///     rgbs_in_vec: vec![green, pink],
+/// };
+/// let json = serde_json::json!({
+///     "one_rgb": [255, 128, 0],
+///     "rgbs_in_vec": [
+///         [0, 255, 0],
+///         [255, 0, 255]
+///     ]
+/// });
+///
+/// assert_eq!(json, serde_json::to_value(&data).unwrap());
+/// assert_eq!(data, serde_json::from_value(json).unwrap());
+///
+/// //////////////////////////////////////////////////
+///
+/// // The types generated by `serde_conv` is also compatible with serde's with attribute
+///
+/// #[derive(Debug, PartialEq, Serialize, Deserialize)]
+/// struct ColorsWith {
+///     #[serde(with = "RgbAsArray")]
+///     rgb_with: Rgb,
+/// }
+///
+/// let data = ColorsWith {
+///     rgb_with: pink,
+/// };
+/// let json = serde_json::json!({
+///     "rgb_with": [255, 0, 255]
+/// });
+///
+/// assert_eq!(json, serde_json::to_value(&data).unwrap());
+/// assert_eq!(data, serde_json::from_value(json).unwrap());
+/// # }
+/// ```
+#[macro_export]
+macro_rules! serde_conv {
+    ($m:ident, $t:ty, $ser:expr, $de:expr) => {$crate::serde_conv!(pub(self) $m, $t, $ser, $de);};
+    ($vis:vis $m:ident, $t:ty, $ser:expr, $de:expr) => {
+        #[allow(non_camel_case_types)]
+        $vis struct $m;
+
+        #[allow(clippy::ptr_arg)]
+        impl $m {
+            $vis fn serialize<S>(x: &$t, serializer: S) -> ::std::result::Result<S::Ok, S::Error>
+            where
+                S: $crate::serde::Serializer,
+            {
+                let y = $ser(x);
+                $crate::serde::Serialize::serialize(&y, serializer)
+            }
+
+            $vis fn deserialize<'de, D>(deserializer: D) -> ::std::result::Result<$t, D::Error>
+            where
+                D: $crate::serde::Deserializer<'de>,
+            {
+                let y = $crate::serde::Deserialize::deserialize(deserializer)?;
+                $de(y).map_err($crate::serde::de::Error::custom)
+            }
+        }
+
+        impl $crate::SerializeAs<$t> for $m {
+            fn serialize_as<S>(x: &$t, serializer: S) -> ::std::result::Result<S::Ok, S::Error>
+            where
+                S: $crate::serde::Serializer,
+            {
+                Self::serialize(x, serializer)
+            }
+        }
+
+        impl<'de> $crate::DeserializeAs<'de, $t> for $m {
+            fn deserialize_as<D>(deserializer: D) -> ::std::result::Result<$t, D::Error>
+            where
+                D: $crate::serde::Deserializer<'de>,
+            {
+                Self::deserialize(deserializer)
+            }
+        }
+    };
+}
diff --git a/third_party/rust/serde_with/src/time_0_3.rs b/third_party/rust/serde_with/src/time_0_3.rs
new file mode 100644
index 0000000000..76dca006d2
--- /dev/null
+++ b/third_party/rust/serde_with/src/time_0_3.rs
@@ -0,0 +1,382 @@
+//! De/Serialization of [time v0.3][time] types
+//!
+//! This modules is only available if using the `time_0_3` feature of the crate.
+//!
+//! [time]: https://docs.rs/time/0.3/
+
+use crate::{
+    de::DeserializeAs,
+    formats::{Flexible, Format, Strict, Strictness},
+    ser::SerializeAs,
+    utils::duration::{DurationSigned, Sign},
+    DurationMicroSeconds, DurationMicroSecondsWithFrac, DurationMilliSeconds,
+    DurationMilliSecondsWithFrac, DurationNanoSeconds, DurationNanoSecondsWithFrac,
+    DurationSeconds, DurationSecondsWithFrac, TimestampMicroSeconds, TimestampMicroSecondsWithFrac,
+    TimestampMilliSeconds, TimestampMilliSecondsWithFrac, TimestampNanoSeconds,
+    TimestampNanoSecondsWithFrac, TimestampSeconds, TimestampSecondsWithFrac,
+};
+use alloc::{format, string::String};
+use serde::{de, ser::Error as _, Deserializer, Serialize, Serializer};
+use std::{convert::TryInto, fmt, time::Duration as StdDuration};
+use time_0_3::{
+    format_description::well_known::{Rfc2822, Rfc3339},
+    Duration, OffsetDateTime, PrimitiveDateTime,
+};
+
+/// Create a [`PrimitiveDateTime`] for the Unix Epoch
+fn unix_epoch_primitive() -> PrimitiveDateTime {
+    PrimitiveDateTime::new(
+        time_0_3::Date::from_ordinal_date(1970, 1).unwrap(),
+        time_0_3::Time::from_hms_nano(0, 0, 0, 0).unwrap(),
+    )
+}
+
+/// Convert a [`time::Duration`][time_0_3::Duration] into a [`DurationSigned`]
+fn duration_into_duration_signed(dur: &Duration) -> DurationSigned {
+    let std_dur = StdDuration::new(
+        dur.whole_seconds().unsigned_abs(),
+        dur.subsec_nanoseconds().unsigned_abs(),
+    );
+
+    DurationSigned::with_duration(
+        // A duration of 0 is not positive, so check for negative value.
+        if dur.is_negative() {
+            Sign::Negative
+        } else {
+            Sign::Positive
+        },
+        std_dur,
+    )
+}
+
+/// Convert a [`DurationSigned`] into a [`time_0_3::Duration`]
+fn duration_from_duration_signed<'de, D>(sdur: DurationSigned) -> Result<Duration, D::Error>
+where
+    D: Deserializer<'de>,
+{
+    let mut dur: Duration = match sdur.duration.try_into() {
+        Ok(dur) => dur,
+        Err(msg) => {
+            return Err(de::Error::custom(format!(
+                "Duration is outside of the representable range: {}",
+                msg
+            )))
+        }
+    };
+    if sdur.sign.is_negative() {
+        dur = -dur;
+    }
+    Ok(dur)
+}
+
+macro_rules! use_duration_signed_ser {
+    (
+        $main_trait:ident $internal_trait:ident =>
+        {
+            $ty:ty; $converter:ident =>
+            $({
+                $format:ty, $strictness:ty =>
+                $($tbound:ident: $bound:ident $(,)?)*
+            })*
+        }
+    ) => {
+        $(
+            impl<$($tbound ,)*> SerializeAs<$ty> for $main_trait<$format, $strictness>
+            where
+                $($tbound: $bound,)*
+            {
+                fn serialize_as<S>(source: &$ty, serializer: S) -> Result<S::Ok, S::Error>
+                where
+                    S: Serializer,
+                {
+                    let dur: DurationSigned = $converter(source);
+                    $internal_trait::<$format, $strictness>::serialize_as(
+                        &dur,
+                        serializer,
+                    )
+                }
+            }
+        )*
+    };
+    (
+        $( $main_trait:ident $internal_trait:ident, )+ => $rest:tt
+    ) => {
+        $( use_duration_signed_ser!($main_trait $internal_trait => $rest); )+
+    };
+}
+
+fn offset_datetime_to_duration(source: &OffsetDateTime) -> DurationSigned {
+    duration_into_duration_signed(&(*source - OffsetDateTime::UNIX_EPOCH))
+}
+
+fn primitive_datetime_to_duration(source: &PrimitiveDateTime) -> DurationSigned {
+    duration_into_duration_signed(&(*source - unix_epoch_primitive()))
+}
+
+use_duration_signed_ser!(
+    DurationSeconds DurationSeconds,
+    DurationMilliSeconds DurationMilliSeconds,
+    DurationMicroSeconds DurationMicroSeconds,
+    DurationNanoSeconds DurationNanoSeconds,
+    => {
+        Duration; duration_into_duration_signed =>
+        {i64, STRICTNESS => STRICTNESS: Strictness}
+        {f64, STRICTNESS => STRICTNESS: Strictness}
+        {String, STRICTNESS => STRICTNESS: Strictness}
+    }
+);
+use_duration_signed_ser!(
+    TimestampSeconds DurationSeconds,
+    TimestampMilliSeconds DurationMilliSeconds,
+    TimestampMicroSeconds DurationMicroSeconds,
+    TimestampNanoSeconds DurationNanoSeconds,
+    => {
+        OffsetDateTime; offset_datetime_to_duration =>
+        {i64, STRICTNESS => STRICTNESS: Strictness}
+        {f64, STRICTNESS => STRICTNESS: Strictness}
+        {String, STRICTNESS => STRICTNESS: Strictness}
+    }
+);
+use_duration_signed_ser!(
+    TimestampSeconds DurationSeconds,
+    TimestampMilliSeconds DurationMilliSeconds,
+    TimestampMicroSeconds DurationMicroSeconds,
+    TimestampNanoSeconds DurationNanoSeconds,
+    => {
+        PrimitiveDateTime; primitive_datetime_to_duration =>
+        {i64, STRICTNESS => STRICTNESS: Strictness}
+        {f64, STRICTNESS => STRICTNESS: Strictness}
+        {String, STRICTNESS => STRICTNESS: Strictness}
+    }
+);
+
+// Duration/Timestamp WITH FRACTIONS
+use_duration_signed_ser!(
+    DurationSecondsWithFrac DurationSecondsWithFrac,
+    DurationMilliSecondsWithFrac DurationMilliSecondsWithFrac,
+    DurationMicroSecondsWithFrac DurationMicroSecondsWithFrac,
+    DurationNanoSecondsWithFrac DurationNanoSecondsWithFrac,
+    => {
+        Duration; duration_into_duration_signed =>
+        {f64, STRICTNESS => STRICTNESS: Strictness}
+        {String, STRICTNESS => STRICTNESS: Strictness}
+    }
+);
+use_duration_signed_ser!(
+    TimestampSecondsWithFrac DurationSecondsWithFrac,
+    TimestampMilliSecondsWithFrac DurationMilliSecondsWithFrac,
+    TimestampMicroSecondsWithFrac DurationMicroSecondsWithFrac,
+    TimestampNanoSecondsWithFrac DurationNanoSecondsWithFrac,
+    => {
+        OffsetDateTime; offset_datetime_to_duration =>
+        {f64, STRICTNESS => STRICTNESS: Strictness}
+        {String, STRICTNESS => STRICTNESS: Strictness}
+    }
+);
+use_duration_signed_ser!(
+    TimestampSecondsWithFrac DurationSecondsWithFrac,
+    TimestampMilliSecondsWithFrac DurationMilliSecondsWithFrac,
+    TimestampMicroSecondsWithFrac DurationMicroSecondsWithFrac,
+    TimestampNanoSecondsWithFrac DurationNanoSecondsWithFrac,
+    => {
+        PrimitiveDateTime; primitive_datetime_to_duration =>
+        {f64, STRICTNESS => STRICTNESS: Strictness}
+        {String, STRICTNESS => STRICTNESS: Strictness}
+    }
+);
+
+macro_rules! use_duration_signed_de {
+    (
+        $main_trait:ident $internal_trait:ident =>
+        {
+            $ty:ty; $converter:ident =>
+            $({
+                $format:ty, $strictness:ty =>
+                $($tbound:ident: $bound:ident)*
+            })*
+        }
+    ) =>{
+        $(
+            impl<'de, $($tbound,)*> DeserializeAs<'de, $ty> for $main_trait<$format, $strictness>
+            where
+                $($tbound: $bound,)*
+            {
+                fn deserialize_as<D>(deserializer: D) -> Result<$ty, D::Error>
+                where
+                    D: Deserializer<'de>,
+                {
+                    let dur: DurationSigned = $internal_trait::<$format, $strictness>::deserialize_as(deserializer)?;
+                    $converter::<D>(dur)
+                }
+            }
+        )*
+    };
+    (
+        $( $main_trait:ident $internal_trait:ident, )+ => $rest:tt
+    ) => {
+        $( use_duration_signed_de!($main_trait $internal_trait => $rest); )+
+    };
+}
+
+fn duration_to_offset_datetime<'de, D>(dur: DurationSigned) -> Result<OffsetDateTime, D::Error>
+where
+    D: Deserializer<'de>,
+{
+    Ok(OffsetDateTime::UNIX_EPOCH + duration_from_duration_signed::<D>(dur)?)
+}
+
+fn duration_to_primitive_datetime<'de, D>(
+    dur: DurationSigned,
+) -> Result<PrimitiveDateTime, D::Error>
+where
+    D: Deserializer<'de>,
+{
+    Ok(unix_epoch_primitive() + duration_from_duration_signed::<D>(dur)?)
+}
+
+// No subsecond precision
+use_duration_signed_de!(
+    DurationSeconds DurationSeconds,
+    DurationMilliSeconds DurationMilliSeconds,
+    DurationMicroSeconds DurationMicroSeconds,
+    DurationNanoSeconds DurationNanoSeconds,
+    => {
+        Duration; duration_from_duration_signed =>
+        {i64, Strict =>}
+        {f64, Strict =>}
+        {String, Strict =>}
+        {FORMAT, Flexible => FORMAT: Format}
+    }
+);
+use_duration_signed_de!(
+    TimestampSeconds DurationSeconds,
+    TimestampMilliSeconds DurationMilliSeconds,
+    TimestampMicroSeconds DurationMicroSeconds,
+    TimestampNanoSeconds DurationNanoSeconds,
+    => {
+        OffsetDateTime; duration_to_offset_datetime =>
+        {i64, Strict =>}
+        {f64, Strict =>}
+        {String, Strict =>}
+        {FORMAT, Flexible => FORMAT: Format}
+    }
+);
+use_duration_signed_de!(
+    TimestampSeconds DurationSeconds,
+    TimestampMilliSeconds DurationMilliSeconds,
+    TimestampMicroSeconds DurationMicroSeconds,
+    TimestampNanoSeconds DurationNanoSeconds,
+    => {
+        PrimitiveDateTime; duration_to_primitive_datetime =>
+        {i64, Strict =>}
+        {f64, Strict =>}
+        {String, Strict =>}
+        {FORMAT, Flexible => FORMAT: Format}
+    }
+);
+
+// Duration/Timestamp WITH FRACTIONS
+use_duration_signed_de!(
+    DurationSecondsWithFrac DurationSecondsWithFrac,
+    DurationMilliSecondsWithFrac DurationMilliSecondsWithFrac,
+    DurationMicroSecondsWithFrac DurationMicroSecondsWithFrac,
+    DurationNanoSecondsWithFrac DurationNanoSecondsWithFrac,
+    => {
+        Duration; duration_from_duration_signed =>
+        {f64, Strict =>}
+        {String, Strict =>}
+        {FORMAT, Flexible => FORMAT: Format}
+    }
+);
+use_duration_signed_de!(
+    TimestampSecondsWithFrac DurationSecondsWithFrac,
+    TimestampMilliSecondsWithFrac DurationMilliSecondsWithFrac,
+    TimestampMicroSecondsWithFrac DurationMicroSecondsWithFrac,
+    TimestampNanoSecondsWithFrac DurationNanoSecondsWithFrac,
+    => {
+        OffsetDateTime; duration_to_offset_datetime =>
+        {f64, Strict =>}
+        {String, Strict =>}
+        {FORMAT, Flexible => FORMAT: Format}
+    }
+);
+use_duration_signed_de!(
+    TimestampSecondsWithFrac DurationSecondsWithFrac,
+    TimestampMilliSecondsWithFrac DurationMilliSecondsWithFrac,
+    TimestampMicroSecondsWithFrac DurationMicroSecondsWithFrac,
+    TimestampNanoSecondsWithFrac DurationNanoSecondsWithFrac,
+    => {
+        PrimitiveDateTime; duration_to_primitive_datetime =>
+        {f64, Strict =>}
+        {String, Strict =>}
+        {FORMAT, Flexible => FORMAT: Format}
+    }
+);
+
+impl SerializeAs<OffsetDateTime> for Rfc2822 {
+    fn serialize_as<S>(datetime: &OffsetDateTime, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        datetime
+            .format(&Rfc2822)
+            .map_err(S::Error::custom)?
+            .serialize(serializer)
+    }
+}
+
+impl<'de> DeserializeAs<'de, OffsetDateTime> for Rfc2822 {
+    fn deserialize_as<D>(deserializer: D) -> Result<OffsetDateTime, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        struct Visitor;
+        impl<'de> de::Visitor<'de> for Visitor {
+            type Value = OffsetDateTime;
+
+            fn expecting(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
+                formatter.write_str("a RFC2822-formatted `OffsetDateTime`")
+            }
+
+            fn visit_str<E: de::Error>(self, value: &str) -> Result<Self::Value, E> {
+                Self::Value::parse(value, &Rfc2822).map_err(E::custom)
+            }
+        }
+
+        deserializer.deserialize_str(Visitor)
+    }
+}
+
+impl SerializeAs<OffsetDateTime> for Rfc3339 {
+    fn serialize_as<S>(datetime: &OffsetDateTime, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        datetime
+            .format(&Rfc3339)
+            .map_err(S::Error::custom)?
+            .serialize(serializer)
+    }
+}
+
+impl<'de> DeserializeAs<'de, OffsetDateTime> for Rfc3339 {
+    fn deserialize_as<D>(deserializer: D) -> Result<OffsetDateTime, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        struct Visitor;
+        impl<'de> de::Visitor<'de> for Visitor {
+            type Value = OffsetDateTime;
+
+            fn expecting(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
+                formatter.write_str("a RFC3339-formatted `OffsetDateTime`")
+            }
+
+            fn visit_str<E: de::Error>(self, value: &str) -> Result<Self::Value, E> {
+                Self::Value::parse(value, &Rfc3339).map_err(E::custom)
+            }
+        }
+
+        deserializer.deserialize_str(Visitor)
+    }
+}
diff --git a/third_party/rust/serde_with/src/utils.rs b/third_party/rust/serde_with/src/utils.rs
new file mode 100644
index 0000000000..ccf99128e4
--- /dev/null
+++ b/third_party/rust/serde_with/src/utils.rs
@@ -0,0 +1,120 @@
+pub(crate) mod duration;
+
+use alloc::string::String;
+use core::marker::PhantomData;
+use serde::de::{Deserialize, MapAccess, SeqAccess};
+
+/// Re-Implementation of `serde::private::de::size_hint::cautious`
+#[inline]
+pub(crate) fn size_hint_cautious(hint: Option<usize>) -> usize {
+    core::cmp::min(hint.unwrap_or(0), 4096)
+}
+
+pub(crate) const NANOS_PER_SEC: u32 = 1_000_000_000;
+// pub(crate) const NANOS_PER_MILLI: u32 = 1_000_000;
+// pub(crate) const NANOS_PER_MICRO: u32 = 1_000;
+// pub(crate) const MILLIS_PER_SEC: u64 = 1_000;
+// pub(crate) const MICROS_PER_SEC: u64 = 1_000_000;
+
+pub(crate) struct MapIter<'de, A, K, V> {
+    pub(crate) access: A,
+    marker: PhantomData<(&'de (), K, V)>,
+}
+
+impl<'de, A, K, V> MapIter<'de, A, K, V> {
+    pub(crate) fn new(access: A) -> Self
+    where
+        A: MapAccess<'de>,
+    {
+        Self {
+            access,
+            marker: PhantomData,
+        }
+    }
+}
+
+impl<'de, A, K, V> Iterator for MapIter<'de, A, K, V>
+where
+    A: MapAccess<'de>,
+    K: Deserialize<'de>,
+    V: Deserialize<'de>,
+{
+    type Item = Result<(K, V), A::Error>;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        self.access.next_entry().transpose()
+    }
+
+    fn size_hint(&self) -> (usize, Option<usize>) {
+        match self.access.size_hint() {
+            Some(size) => (size, Some(size)),
+            None => (0, None),
+        }
+    }
+}
+
+pub(crate) struct SeqIter<'de, A, T> {
+    access: A,
+    marker: PhantomData<(&'de (), T)>,
+}
+
+impl<'de, A, T> SeqIter<'de, A, T> {
+    pub(crate) fn new(access: A) -> Self
+    where
+        A: SeqAccess<'de>,
+    {
+        Self {
+            access,
+            marker: PhantomData,
+        }
+    }
+}
+
+impl<'de, A, T> Iterator for SeqIter<'de, A, T>
+where
+    A: SeqAccess<'de>,
+    T: Deserialize<'de>,
+{
+    type Item = Result<T, A::Error>;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        self.access.next_element().transpose()
+    }
+
+    fn size_hint(&self) -> (usize, Option<usize>) {
+        match self.access.size_hint() {
+            Some(size) => (size, Some(size)),
+            None => (0, None),
+        }
+    }
+}
+
+pub(crate) fn duration_as_secs_f64(dur: &core::time::Duration) -> f64 {
+    (dur.as_secs() as f64) + (dur.subsec_nanos() as f64) / (NANOS_PER_SEC as f64)
+}
+
+pub(crate) fn duration_signed_from_secs_f64(
+    secs: f64,
+) -> Result<self::duration::DurationSigned, String> {
+    const MAX_NANOS_F64: f64 = ((u64::max_value() as u128 + 1) * (NANOS_PER_SEC as u128)) as f64;
+    // TODO why are the seconds converted to nanoseconds first?
+    // Does it make sense to just truncate the value?
+    let mut nanos = secs * (NANOS_PER_SEC as f64);
+    if !nanos.is_finite() {
+        return Err("got non-finite value when converting float to duration".into());
+    }
+    if nanos >= MAX_NANOS_F64 {
+        return Err("overflow when converting float to duration".into());
+    }
+    let mut sign = self::duration::Sign::Positive;
+    if nanos < 0.0 {
+        nanos = -nanos;
+        sign = self::duration::Sign::Negative;
+    }
+    let nanos = nanos as u128;
+    Ok(self::duration::DurationSigned::new(
+        sign,
+        (nanos / (NANOS_PER_SEC as u128)) as u64,
+        (nanos % (NANOS_PER_SEC as u128)) as u32,
+    ))
+}
diff --git a/third_party/rust/serde_with/src/utils/duration.rs b/third_party/rust/serde_with/src/utils/duration.rs
new file mode 100644
index 0000000000..2d5a27e87d
--- /dev/null
+++ b/third_party/rust/serde_with/src/utils/duration.rs
@@ -0,0 +1,559 @@
+//! Internal Helper types
+
+use crate::{
+    formats::{Flexible, Format, Strict, Strictness},
+    utils, DeserializeAs, DurationMicroSeconds, DurationMicroSecondsWithFrac, DurationMilliSeconds,
+    DurationMilliSecondsWithFrac, DurationNanoSeconds, DurationNanoSecondsWithFrac,
+    DurationSeconds, DurationSecondsWithFrac, SerializeAs,
+};
+use alloc::{
+    format,
+    string::{String, ToString},
+    vec::Vec,
+};
+use core::{fmt, ops::Neg, time::Duration};
+use serde::{
+    de::{self, Unexpected, Visitor},
+    ser, Deserialize, Deserializer, Serialize, Serializer,
+};
+use std::time::SystemTime;
+
+#[derive(Copy, Clone, Debug, Eq, PartialEq)]
+pub(crate) enum Sign {
+    Positive,
+    Negative,
+}
+
+impl Sign {
+    #[allow(dead_code)]
+    pub(crate) fn is_positive(&self) -> bool {
+        *self == Sign::Positive
+    }
+
+    #[allow(dead_code)]
+    pub(crate) fn is_negative(&self) -> bool {
+        *self == Sign::Negative
+    }
+
+    pub(crate) fn apply<T>(&self, value: T) -> T
+    where
+        T: Neg<Output = T>,
+    {
+        match *self {
+            Sign::Positive => value,
+            Sign::Negative => value.neg(),
+        }
+    }
+}
+
+#[derive(Copy, Clone, Debug)]
+pub(crate) struct DurationSigned {
+    pub(crate) sign: Sign,
+    pub(crate) duration: Duration,
+}
+
+impl DurationSigned {
+    pub(crate) fn new(sign: Sign, secs: u64, nanosecs: u32) -> Self {
+        Self {
+            sign,
+            duration: Duration::new(secs, nanosecs),
+        }
+    }
+
+    #[cfg(any(feature = "chrono", feature = "time_0_3"))]
+    pub(crate) fn with_duration(sign: Sign, duration: Duration) -> Self {
+        Self { sign, duration }
+    }
+
+    pub(crate) fn to_system_time<'de, D>(self) -> Result<SystemTime, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        match self.sign {
+            Sign::Positive => SystemTime::UNIX_EPOCH.checked_add(self.duration),
+            Sign::Negative => SystemTime::UNIX_EPOCH.checked_sub(self.duration),
+        }
+        .ok_or_else(|| {
+            de::Error::custom("timestamp is outside the range for std::time::SystemTime")
+        })
+    }
+
+    pub(crate) fn to_std_duration<'de, D>(self) -> Result<Duration, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        match self.sign {
+            Sign::Positive => Ok(self.duration),
+            Sign::Negative => Err(de::Error::custom("std::time::Duration cannot be negative")),
+        }
+    }
+}
+
+impl From<&Duration> for DurationSigned {
+    fn from(&duration: &Duration) -> Self {
+        Self {
+            sign: Sign::Positive,
+            duration,
+        }
+    }
+}
+
+impl From<&SystemTime> for DurationSigned {
+    fn from(time: &SystemTime) -> Self {
+        match time.duration_since(SystemTime::UNIX_EPOCH) {
+            Ok(dur) => DurationSigned {
+                sign: Sign::Positive,
+                duration: dur,
+            },
+            Err(err) => DurationSigned {
+                sign: Sign::Negative,
+                duration: err.duration(),
+            },
+        }
+    }
+}
+
+impl core::ops::Mul<u32> for DurationSigned {
+    type Output = DurationSigned;
+
+    fn mul(mut self, rhs: u32) -> Self::Output {
+        self.duration *= rhs;
+        self
+    }
+}
+
+impl core::ops::Div<u32> for DurationSigned {
+    type Output = DurationSigned;
+
+    fn div(mut self, rhs: u32) -> Self::Output {
+        self.duration /= rhs;
+        self
+    }
+}
+
+impl<STRICTNESS> SerializeAs<DurationSigned> for DurationSeconds<u64, STRICTNESS>
+where
+    STRICTNESS: Strictness,
+{
+    fn serialize_as<S>(source: &DurationSigned, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        if source.sign.is_negative() {
+            return Err(ser::Error::custom(
+                "cannot serialize a negative Duration as u64",
+            ));
+        }
+
+        let mut secs = source.duration.as_secs();
+
+        // Properly round the value
+        if source.duration.subsec_millis() >= 500 {
+            if source.sign.is_positive() {
+                secs += 1;
+            } else {
+                secs -= 1;
+            }
+        }
+        secs.serialize(serializer)
+    }
+}
+
+impl<STRICTNESS> SerializeAs<DurationSigned> for DurationSeconds<i64, STRICTNESS>
+where
+    STRICTNESS: Strictness,
+{
+    fn serialize_as<S>(source: &DurationSigned, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        let mut secs = source.sign.apply(source.duration.as_secs() as i64);
+
+        // Properly round the value
+        if source.duration.subsec_millis() >= 500 {
+            if source.sign.is_positive() {
+                secs += 1;
+            } else {
+                secs -= 1;
+            }
+        }
+        secs.serialize(serializer)
+    }
+}
+
+impl<STRICTNESS> SerializeAs<DurationSigned> for DurationSeconds<f64, STRICTNESS>
+where
+    STRICTNESS: Strictness,
+{
+    fn serialize_as<S>(source: &DurationSigned, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        let mut secs = source.sign.apply(source.duration.as_secs() as f64);
+
+        // Properly round the value
+        if source.duration.subsec_millis() >= 500 {
+            if source.sign.is_positive() {
+                secs += 1.;
+            } else {
+                secs -= 1.;
+            }
+        }
+        secs.serialize(serializer)
+    }
+}
+
+impl<STRICTNESS> SerializeAs<DurationSigned> for DurationSeconds<String, STRICTNESS>
+where
+    STRICTNESS: Strictness,
+{
+    fn serialize_as<S>(source: &DurationSigned, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        let mut secs = source.sign.apply(source.duration.as_secs() as i64);
+
+        // Properly round the value
+        if source.duration.subsec_millis() >= 500 {
+            if source.sign.is_positive() {
+                secs += 1;
+            } else {
+                secs -= 1;
+            }
+        }
+        secs.to_string().serialize(serializer)
+    }
+}
+
+impl<STRICTNESS> SerializeAs<DurationSigned> for DurationSecondsWithFrac<f64, STRICTNESS>
+where
+    STRICTNESS: Strictness,
+{
+    fn serialize_as<S>(source: &DurationSigned, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        source
+            .sign
+            .apply(utils::duration_as_secs_f64(&source.duration))
+            .serialize(serializer)
+    }
+}
+
+impl<STRICTNESS> SerializeAs<DurationSigned> for DurationSecondsWithFrac<String, STRICTNESS>
+where
+    STRICTNESS: Strictness,
+{
+    fn serialize_as<S>(source: &DurationSigned, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        source
+            .sign
+            .apply(utils::duration_as_secs_f64(&source.duration))
+            .to_string()
+            .serialize(serializer)
+    }
+}
+
+macro_rules! duration_impls {
+    ($($inner:ident { $($factor:literal => $outer:ident,)+ })+) => {
+        $($(
+
+        impl<FORMAT, STRICTNESS> SerializeAs<DurationSigned> for $outer<FORMAT, STRICTNESS>
+        where
+            FORMAT: Format,
+            STRICTNESS: Strictness,
+            $inner<FORMAT, STRICTNESS>: SerializeAs<DurationSigned>
+        {
+            fn serialize_as<S>(source: &DurationSigned, serializer: S) -> Result<S::Ok, S::Error>
+            where
+                S: Serializer,
+            {
+                $inner::<FORMAT, STRICTNESS>::serialize_as(&(*source * $factor), serializer)
+            }
+        }
+
+        impl<'de, FORMAT, STRICTNESS> DeserializeAs<'de, DurationSigned> for $outer<FORMAT, STRICTNESS>
+        where
+            FORMAT: Format,
+            STRICTNESS: Strictness,
+            $inner<FORMAT, STRICTNESS>: DeserializeAs<'de, DurationSigned>,
+        {
+            fn deserialize_as<D>(deserializer: D) -> Result<DurationSigned, D::Error>
+            where
+                D: Deserializer<'de>,
+            {
+                let dur = $inner::<FORMAT, STRICTNESS>::deserialize_as(deserializer)?;
+                Ok(dur / $factor)
+            }
+        }
+
+        )+)+    };
+}
+duration_impls!(
+    DurationSeconds {
+        1000u32 => DurationMilliSeconds,
+        1_000_000u32 => DurationMicroSeconds,
+        1_000_000_000u32 => DurationNanoSeconds,
+    }
+    DurationSecondsWithFrac {
+        1000u32 => DurationMilliSecondsWithFrac,
+        1_000_000u32 => DurationMicroSecondsWithFrac,
+        1_000_000_000u32 => DurationNanoSecondsWithFrac,
+    }
+);
+
+struct DurationVisitorFlexible;
+impl<'de> Visitor<'de> for DurationVisitorFlexible {
+    type Value = DurationSigned;
+
+    fn expecting(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
+        formatter.write_str("an integer, a float, or a string containing a number")
+    }
+
+    fn visit_i64<E>(self, value: i64) -> Result<Self::Value, E>
+    where
+        E: de::Error,
+    {
+        if value >= 0 {
+            Ok(DurationSigned::new(Sign::Positive, value as u64, 0))
+        } else {
+            Ok(DurationSigned::new(Sign::Negative, (-value) as u64, 0))
+        }
+    }
+
+    fn visit_u64<E>(self, secs: u64) -> Result<Self::Value, E>
+    where
+        E: de::Error,
+    {
+        Ok(DurationSigned::new(Sign::Positive, secs, 0))
+    }
+
+    fn visit_f64<E>(self, secs: f64) -> Result<Self::Value, E>
+    where
+        E: de::Error,
+    {
+        utils::duration_signed_from_secs_f64(secs).map_err(de::Error::custom)
+    }
+
+    fn visit_str<E>(self, value: &str) -> Result<Self::Value, E>
+    where
+        E: de::Error,
+    {
+        match parse_float_into_time_parts(value) {
+            Ok((sign, seconds, subseconds)) => Ok(DurationSigned::new(sign, seconds, subseconds)),
+            Err(ParseFloatError::InvalidValue) => {
+                Err(de::Error::invalid_value(Unexpected::Str(value), &self))
+            }
+            Err(ParseFloatError::Custom(msg)) => Err(de::Error::custom(msg)),
+        }
+    }
+}
+
+impl<'de> DeserializeAs<'de, DurationSigned> for DurationSeconds<u64, Strict> {
+    fn deserialize_as<D>(deserializer: D) -> Result<DurationSigned, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        u64::deserialize(deserializer).map(|secs: u64| DurationSigned::new(Sign::Positive, secs, 0))
+    }
+}
+
+impl<'de> DeserializeAs<'de, DurationSigned> for DurationSeconds<i64, Strict> {
+    fn deserialize_as<D>(deserializer: D) -> Result<DurationSigned, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        i64::deserialize(deserializer).map(|mut secs: i64| {
+            let mut sign = Sign::Positive;
+            if secs.is_negative() {
+                secs = -secs;
+                sign = Sign::Negative;
+            }
+            DurationSigned::new(sign, secs as u64, 0)
+        })
+    }
+}
+
+impl<'de> DeserializeAs<'de, DurationSigned> for DurationSeconds<f64, Strict> {
+    fn deserialize_as<D>(deserializer: D) -> Result<DurationSigned, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        let val = f64::deserialize(deserializer)?.round();
+        utils::duration_signed_from_secs_f64(val).map_err(de::Error::custom)
+    }
+}
+
+impl<'de> DeserializeAs<'de, DurationSigned> for DurationSeconds<String, Strict> {
+    fn deserialize_as<D>(deserializer: D) -> Result<DurationSigned, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        struct DurationDeserializationVisitor;
+
+        impl<'de> Visitor<'de> for DurationDeserializationVisitor {
+            type Value = DurationSigned;
+
+            fn expecting(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
+                write!(formatter, "a string containing a number")
+            }
+
+            fn visit_str<E>(self, value: &str) -> Result<Self::Value, E>
+            where
+                E: de::Error,
+            {
+                let mut secs: i64 = value.parse().map_err(de::Error::custom)?;
+                let mut sign = Sign::Positive;
+                if secs.is_negative() {
+                    secs = -secs;
+                    sign = Sign::Negative;
+                }
+                Ok(DurationSigned::new(sign, secs as u64, 0))
+            }
+        }
+
+        deserializer.deserialize_str(DurationDeserializationVisitor)
+    }
+}
+
+impl<'de, FORMAT> DeserializeAs<'de, DurationSigned> for DurationSeconds<FORMAT, Flexible>
+where
+    FORMAT: Format,
+{
+    fn deserialize_as<D>(deserializer: D) -> Result<DurationSigned, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        deserializer.deserialize_any(DurationVisitorFlexible)
+    }
+}
+
+impl<'de> DeserializeAs<'de, DurationSigned> for DurationSecondsWithFrac<f64, Strict> {
+    fn deserialize_as<D>(deserializer: D) -> Result<DurationSigned, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        let val = f64::deserialize(deserializer)?;
+        utils::duration_signed_from_secs_f64(val).map_err(de::Error::custom)
+    }
+}
+
+impl<'de> DeserializeAs<'de, DurationSigned> for DurationSecondsWithFrac<String, Strict> {
+    fn deserialize_as<D>(deserializer: D) -> Result<DurationSigned, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        let value = String::deserialize(deserializer)?;
+        match parse_float_into_time_parts(&value) {
+            Ok((sign, seconds, subseconds)) => Ok(DurationSigned {
+                sign,
+                duration: Duration::new(seconds, subseconds),
+            }),
+            Err(ParseFloatError::InvalidValue) => Err(de::Error::invalid_value(
+                Unexpected::Str(&value),
+                &"a string containing an integer or float",
+            )),
+            Err(ParseFloatError::Custom(msg)) => Err(de::Error::custom(msg)),
+        }
+    }
+}
+
+impl<'de, FORMAT> DeserializeAs<'de, DurationSigned> for DurationSecondsWithFrac<FORMAT, Flexible>
+where
+    FORMAT: Format,
+{
+    fn deserialize_as<D>(deserializer: D) -> Result<DurationSigned, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        deserializer.deserialize_any(DurationVisitorFlexible)
+    }
+}
+
+#[derive(Debug, Eq, PartialEq)]
+pub(crate) enum ParseFloatError {
+    InvalidValue,
+    Custom(String),
+}
+
+fn parse_float_into_time_parts(mut value: &str) -> Result<(Sign, u64, u32), ParseFloatError> {
+    let sign = match value.chars().next() {
+        // Advance by the size of the parsed char
+        Some('+') => {
+            value = &value[1..];
+            Sign::Positive
+        }
+        Some('-') => {
+            value = &value[1..];
+            Sign::Negative
+        }
+        _ => Sign::Positive,
+    };
+
+    let parts: Vec<_> = value.split('.').collect();
+    match *parts.as_slice() {
+        [seconds] => {
+            if let Ok(seconds) = seconds.parse() {
+                Ok((sign, seconds, 0))
+            } else {
+                Err(ParseFloatError::InvalidValue)
+            }
+        }
+        [seconds, subseconds] => {
+            if let Ok(seconds) = seconds.parse() {
+                let subseclen = subseconds.chars().count() as u32;
+                if subseclen > 9 {
+                    return Err(ParseFloatError::Custom(format!(
+                        "Duration and Timestamps with no more than 9 digits precision, but '{}' has more",
+                        value
+                    )));
+                }
+
+                if let Ok(mut subseconds) = subseconds.parse() {
+                    // convert subseconds to nanoseconds (10^-9), require 9 places for nanoseconds
+                    subseconds *= 10u32.pow(9 - subseclen);
+                    Ok((sign, seconds, subseconds))
+                } else {
+                    Err(ParseFloatError::InvalidValue)
+                }
+            } else {
+                Err(ParseFloatError::InvalidValue)
+            }
+        }
+
+        _ => Err(ParseFloatError::InvalidValue),
+    }
+}
+
+#[test]
+fn test_parse_float_into_time_parts() {
+    // Test normal behavior
+    assert_eq!(
+        Ok((Sign::Positive, 123, 456_000_000)),
+        parse_float_into_time_parts("+123.456")
+    );
+    assert_eq!(
+        Ok((Sign::Negative, 123, 987_000)),
+        parse_float_into_time_parts("-123.000987")
+    );
+    assert_eq!(
+        Ok((Sign::Positive, 18446744073709551615, 123_456_789)),
+        parse_float_into_time_parts("18446744073709551615.123456789")
+    );
+
+    // Test behavior around 0
+    assert_eq!(
+        Ok((Sign::Positive, 0, 456_000_000)),
+        parse_float_into_time_parts("+0.456")
+    );
+    assert_eq!(
+        Ok((Sign::Negative, 0, 987_000)),
+        parse_float_into_time_parts("-0.000987")
+    );
+    assert_eq!(
+        Ok((Sign::Positive, 0, 123_456_789)),
+        parse_float_into_time_parts("0.123456789")
+    );
+}
diff --git a/third_party/rust/serde_with/src/with_prefix.rs b/third_party/rust/serde_with/src/with_prefix.rs
new file mode 100644
index 0000000000..b4b483c983
--- /dev/null
+++ b/third_party/rust/serde_with/src/with_prefix.rs
@@ -0,0 +1,612 @@
+use alloc::string::String;
+use core::fmt;
+use serde::{
+    de::{self, DeserializeSeed, Deserializer, IgnoredAny, IntoDeserializer, MapAccess, Visitor},
+    forward_to_deserialize_any,
+    ser::{self, Impossible, Serialize, SerializeMap, SerializeStruct, Serializer},
+};
+
+/// Serialize with an added prefix on every field name and deserialize by
+/// trimming away the prefix.
+///
+/// You can set the visibility of the generated module by prefixing the module name with a module visibility.
+/// `with_prefix!(pub(crate) prefix_foo "foo_");` creates a module with `pub(crate)` visibility.
+/// The visibility is optional and by default `pub(self)`, i.e., private visibility is assumed.
+///
+/// **Note:** Use of this macro is incompatible with applying the [`deny_unknown_fields`] attribute
+/// on the container.
+/// While deserializing, it will always warn about unknown fields, even though they are processed
+/// by the `with_prefix` wrapper.
+/// More details can be found in [this issue][issue-with_prefix-deny_unknown_fields].
+///
+/// # Example
+///
+/// The [Challonge REST API] likes to use prefixes to group related fields. In
+/// simplified form, their JSON may resemble the following:
+///
+/// [Challonge REST API]: https://api.challonge.com/v1/documents/matches/show
+///
+/// ```json
+/// {
+///   "player1_name": "name1",
+///   "player1_votes": 1,
+///   "player2_name": "name2",
+///   "player2_votes": 2
+/// }
+/// ```
+///
+/// In Rust, we would ideally like to model this data as a pair of `Player`
+/// structs, rather than repeating the fields of `Player` for each prefix.
+///
+/// ```rust
+/// # #[allow(dead_code)]
+/// struct Match {
+///     player1: Player,
+///     player2: Player,
+/// }
+///
+/// # #[allow(dead_code)]
+/// struct Player {
+///     name: String,
+///     votes: u64,
+/// }
+/// ```
+///
+/// This `with_prefix!` macro produces an adapter that adds a prefix onto field
+/// names during serialization and trims away the prefix during deserialization.
+/// An implementation of the Challonge API would use `with_prefix!` like this:
+///
+/// ```rust
+/// use serde::{Deserialize, Serialize};
+/// use serde_with::with_prefix;
+///
+/// #[derive(Serialize, Deserialize)]
+/// struct Match {
+///     #[serde(flatten, with = "prefix_player1")]
+///     player1: Player,
+///     #[serde(flatten, with = "prefix_player2")]
+///     player2: Player,
+/// }
+///
+/// #[derive(Serialize, Deserialize)]
+/// struct Player {
+///     name: String,
+///     votes: u64,
+/// }
+///
+/// with_prefix!(prefix_player1 "player1_");
+/// // You can also set the visibility of the generated prefix module, the default is private.
+/// with_prefix!(pub prefix_player2 "player2_");
+/// #
+/// # const EXPECTED: &str = r#"{
+/// #   "player1_name": "name1",
+/// #   "player1_votes": 1,
+/// #   "player2_name": "name2",
+/// #   "player2_votes": 2
+/// # }"#;
+///
+/// fn main() {
+///     let m = Match {
+///         player1: Player {
+///             name: "name1".to_owned(),
+///             votes: 1,
+///         },
+///         player2: Player {
+///             name: "name2".to_owned(),
+///             votes: 2,
+///         },
+///     };
+///
+///     let j = serde_json::to_string_pretty(&m).unwrap();
+///     println!("{}", j);
+/// #
+/// #     assert_eq!(j, EXPECTED);
+/// }
+/// ```
+///
+/// [`deny_unknown_fields`]: https://serde.rs/container-attrs.html#deny_unknown_fields
+/// [issue-with_prefix-deny_unknown_fields]: https://github.com/jonasbb/serde_with/issues/57
+#[macro_export]
+macro_rules! with_prefix {
+    ($module:ident $prefix:expr) => {$crate::with_prefix!(pub(self) $module $prefix);};
+    ($vis:vis $module:ident $prefix:expr) => {
+        $vis mod $module {
+            use $crate::serde::{Deserialize, Deserializer, Serialize, Serializer};
+            use $crate::with_prefix::WithPrefix;
+
+            #[allow(dead_code)]
+            pub fn serialize<T, S>(object: &T, serializer: S) -> ::std::result::Result<S::Ok, S::Error>
+            where
+                T: Serialize,
+                S: Serializer,
+            {
+                object.serialize(WithPrefix {
+                    delegate: serializer,
+                    prefix: $prefix,
+                })
+            }
+
+            #[allow(dead_code)]
+            pub fn deserialize<'de, T, D>(deserializer: D) -> ::std::result::Result<T, D::Error>
+            where
+                T: Deserialize<'de>,
+                D: Deserializer<'de>,
+            {
+                T::deserialize(WithPrefix {
+                    delegate: deserializer,
+                    prefix: $prefix,
+                })
+            }
+        }
+    };
+}
+
+#[allow(missing_debug_implementations)]
+pub struct WithPrefix<'a, T> {
+    pub delegate: T,
+    pub prefix: &'a str,
+}
+
+impl<'a, T> Serialize for WithPrefix<'a, T>
+where
+    T: Serialize,
+{
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        self.delegate.serialize(WithPrefix {
+            delegate: serializer,
+            prefix: self.prefix,
+        })
+    }
+}
+
+impl<'a, S> Serializer for WithPrefix<'a, S>
+where
+    S: Serializer,
+{
+    type Ok = S::Ok;
+    type Error = S::Error;
+    type SerializeSeq = Impossible<Self::Ok, Self::Error>;
+    type SerializeTuple = Impossible<Self::Ok, Self::Error>;
+    type SerializeTupleStruct = Impossible<Self::Ok, Self::Error>;
+    type SerializeTupleVariant = Impossible<Self::Ok, Self::Error>;
+    type SerializeMap = WithPrefix<'a, S::SerializeMap>;
+    type SerializeStruct = WithPrefix<'a, S::SerializeMap>;
+    type SerializeStructVariant = Impossible<Self::Ok, Self::Error>;
+
+    fn serialize_bool(self, _v: bool) -> Result<Self::Ok, Self::Error> {
+        Err(ser::Error::custom("wrong type for with_prefix"))
+    }
+
+    fn serialize_i8(self, _v: i8) -> Result<Self::Ok, Self::Error> {
+        Err(ser::Error::custom("wrong type for with_prefix"))
+    }
+
+    fn serialize_i16(self, _v: i16) -> Result<Self::Ok, Self::Error> {
+        Err(ser::Error::custom("wrong type for with_prefix"))
+    }
+
+    fn serialize_i32(self, _v: i32) -> Result<Self::Ok, Self::Error> {
+        Err(ser::Error::custom("wrong type for with_prefix"))
+    }
+
+    fn serialize_i64(self, _v: i64) -> Result<Self::Ok, Self::Error> {
+        Err(ser::Error::custom("wrong type for with_prefix"))
+    }
+
+    fn serialize_u8(self, _v: u8) -> Result<Self::Ok, Self::Error> {
+        Err(ser::Error::custom("wrong type for with_prefix"))
+    }
+
+    fn serialize_u16(self, _v: u16) -> Result<Self::Ok, Self::Error> {
+        Err(ser::Error::custom("wrong type for with_prefix"))
+    }
+
+    fn serialize_u32(self, _v: u32) -> Result<Self::Ok, Self::Error> {
+        Err(ser::Error::custom("wrong type for with_prefix"))
+    }
+
+    fn serialize_u64(self, _v: u64) -> Result<Self::Ok, Self::Error> {
+        Err(ser::Error::custom("wrong type for with_prefix"))
+    }
+
+    fn serialize_f32(self, _v: f32) -> Result<Self::Ok, Self::Error> {
+        Err(ser::Error::custom("wrong type for with_prefix"))
+    }
+
+    fn serialize_f64(self, _v: f64) -> Result<Self::Ok, Self::Error> {
+        Err(ser::Error::custom("wrong type for with_prefix"))
+    }
+
+    fn serialize_char(self, _v: char) -> Result<Self::Ok, Self::Error> {
+        Err(ser::Error::custom("wrong type for with_prefix"))
+    }
+
+    fn serialize_str(self, v: &str) -> Result<Self::Ok, Self::Error> {
+        self.delegate
+            .collect_str(&format_args!("{}{}", self.prefix, v))
+    }
+
+    fn serialize_bytes(self, _v: &[u8]) -> Result<Self::Ok, Self::Error> {
+        Err(ser::Error::custom("wrong type for with_prefix"))
+    }
+
+    fn serialize_none(self) -> Result<Self::Ok, Self::Error> {
+        self.delegate.serialize_none()
+    }
+
+    fn serialize_some<T>(self, value: &T) -> Result<Self::Ok, Self::Error>
+    where
+        T: ?Sized + Serialize,
+    {
+        self.delegate.serialize_some(&WithPrefix {
+            delegate: value,
+            prefix: self.prefix,
+        })
+    }
+
+    fn serialize_unit(self) -> Result<Self::Ok, Self::Error> {
+        Err(ser::Error::custom("wrong type for with_prefix"))
+    }
+
+    fn serialize_unit_struct(self, _name: &'static str) -> Result<Self::Ok, Self::Error> {
+        Err(ser::Error::custom("wrong type for with_prefix"))
+    }
+
+    fn serialize_unit_variant(
+        self,
+        _name: &'static str,
+        _variant_index: u32,
+        variant: &'static str,
+    ) -> Result<Self::Ok, Self::Error> {
+        self.serialize_str(variant)
+    }
+
+    fn serialize_newtype_struct<T>(
+        self,
+        _name: &'static str,
+        _value: &T,
+    ) -> Result<Self::Ok, Self::Error>
+    where
+        T: ?Sized + Serialize,
+    {
+        Err(ser::Error::custom("wrong type for with_prefix"))
+    }
+
+    fn serialize_newtype_variant<T>(
+        self,
+        _name: &'static str,
+        _variant_index: u32,
+        _variant: &'static str,
+        _value: &T,
+    ) -> Result<Self::Ok, Self::Error>
+    where
+        T: ?Sized + Serialize,
+    {
+        Err(ser::Error::custom("wrong type for with_prefix"))
+    }
+
+    fn serialize_seq(self, _len: Option<usize>) -> Result<Self::SerializeSeq, Self::Error> {
+        Err(ser::Error::custom("wrong type for with_prefix"))
+    }
+
+    fn serialize_tuple(self, _len: usize) -> Result<Self::SerializeTuple, Self::Error> {
+        Err(ser::Error::custom("wrong type for with_prefix"))
+    }
+
+    fn serialize_tuple_struct(
+        self,
+        _name: &'static str,
+        _len: usize,
+    ) -> Result<Self::SerializeTupleStruct, Self::Error> {
+        Err(ser::Error::custom("wrong type for with_prefix"))
+    }
+
+    fn serialize_tuple_variant(
+        self,
+        _name: &'static str,
+        _variant_index: u32,
+        _variant: &'static str,
+        _len: usize,
+    ) -> Result<Self::SerializeTupleVariant, Self::Error> {
+        Err(ser::Error::custom("wrong type for with_prefix"))
+    }
+
+    fn serialize_map(self, len: Option<usize>) -> Result<Self::SerializeMap, Self::Error> {
+        Ok(WithPrefix {
+            delegate: self.delegate.serialize_map(len)?,
+            prefix: self.prefix,
+        })
+    }
+
+    fn serialize_struct(
+        self,
+        _name: &'static str,
+        len: usize,
+    ) -> Result<Self::SerializeStruct, Self::Error> {
+        self.serialize_map(Some(len))
+    }
+
+    fn serialize_struct_variant(
+        self,
+        _name: &'static str,
+        _variant_index: u32,
+        _variant: &'static str,
+        _len: usize,
+    ) -> Result<Self::SerializeStructVariant, Self::Error> {
+        Err(ser::Error::custom("wrong type for with_prefix"))
+    }
+}
+
+impl<'a, S> SerializeMap for WithPrefix<'a, S>
+where
+    S: SerializeMap,
+{
+    type Ok = S::Ok;
+    type Error = S::Error;
+
+    fn serialize_key<T>(&mut self, key: &T) -> Result<(), Self::Error>
+    where
+        T: ?Sized + Serialize,
+    {
+        self.delegate.serialize_key(&WithPrefix {
+            delegate: key,
+            prefix: self.prefix,
+        })
+    }
+
+    fn serialize_value<T>(&mut self, value: &T) -> Result<(), Self::Error>
+    where
+        T: ?Sized + Serialize,
+    {
+        self.delegate.serialize_value(value)
+    }
+
+    fn serialize_entry<K, V>(&mut self, key: &K, value: &V) -> Result<(), Self::Error>
+    where
+        K: ?Sized + Serialize,
+        V: ?Sized + Serialize,
+    {
+        self.delegate.serialize_entry(
+            &WithPrefix {
+                delegate: key,
+                prefix: self.prefix,
+            },
+            value,
+        )
+    }
+
+    fn end(self) -> Result<Self::Ok, Self::Error> {
+        self.delegate.end()
+    }
+}
+
+impl<'a, S> SerializeStruct for WithPrefix<'a, S>
+where
+    S: SerializeMap,
+{
+    type Ok = S::Ok;
+    type Error = S::Error;
+
+    fn serialize_field<T>(&mut self, key: &'static str, value: &T) -> Result<(), Self::Error>
+    where
+        T: ?Sized + Serialize,
+    {
+        let mut prefixed_key = String::with_capacity(self.prefix.len() + key.len());
+        prefixed_key.push_str(self.prefix);
+        prefixed_key.push_str(key);
+        self.delegate.serialize_entry(&prefixed_key, value)
+    }
+
+    fn end(self) -> Result<Self::Ok, Self::Error> {
+        self.delegate.end()
+    }
+}
+
+impl<'de, 'a, T> DeserializeSeed<'de> for WithPrefix<'a, T>
+where
+    T: DeserializeSeed<'de>,
+{
+    type Value = T::Value;
+
+    fn deserialize<D>(self, deserializer: D) -> Result<Self::Value, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        self.delegate.deserialize(WithPrefix {
+            delegate: deserializer,
+            prefix: self.prefix,
+        })
+    }
+}
+
+impl<'de, 'a, D> Deserializer<'de> for WithPrefix<'a, D>
+where
+    D: Deserializer<'de>,
+{
+    type Error = D::Error;
+
+    fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Self::Error>
+    where
+        V: Visitor<'de>,
+    {
+        self.delegate.deserialize_map(WithPrefix {
+            delegate: visitor,
+            prefix: self.prefix,
+        })
+    }
+
+    fn deserialize_option<V>(self, visitor: V) -> Result<V::Value, Self::Error>
+    where
+        V: Visitor<'de>,
+    {
+        self.delegate.deserialize_any(WithPrefixOption {
+            first_key: None,
+            delegate: visitor,
+            prefix: self.prefix,
+        })
+    }
+
+    fn deserialize_identifier<V>(self, visitor: V) -> Result<V::Value, Self::Error>
+    where
+        V: Visitor<'de>,
+    {
+        self.delegate.deserialize_identifier(WithPrefix {
+            delegate: visitor,
+            prefix: self.prefix,
+        })
+    }
+
+    forward_to_deserialize_any! {
+        bool i8 i16 i32 i64 i128 u8 u16 u32 u64 u128 f32 f64 char str string
+        bytes byte_buf unit unit_struct newtype_struct seq tuple tuple_struct
+        map struct enum ignored_any
+    }
+}
+
+impl<'de, 'a, V> Visitor<'de> for WithPrefix<'a, V>
+where
+    V: Visitor<'de>,
+{
+    type Value = V::Value;
+
+    fn expecting(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
+        self.delegate.expecting(formatter)
+    }
+
+    fn visit_map<A>(self, map: A) -> Result<Self::Value, A::Error>
+    where
+        A: MapAccess<'de>,
+    {
+        self.delegate.visit_map(WithPrefix {
+            delegate: map,
+            prefix: self.prefix,
+        })
+    }
+}
+
+impl<'de, 'a, A> MapAccess<'de> for WithPrefix<'a, A>
+where
+    A: MapAccess<'de>,
+{
+    type Error = A::Error;
+
+    fn next_key_seed<K>(&mut self, seed: K) -> Result<Option<K::Value>, Self::Error>
+    where
+        K: DeserializeSeed<'de>,
+    {
+        while let Some(s) = self.delegate.next_key::<String>()? {
+            if let Some(without_prefix) = s.strip_prefix(self.prefix) {
+                return seed
+                    .deserialize(without_prefix.into_deserializer())
+                    .map(Some);
+            }
+            self.delegate.next_value::<IgnoredAny>()?;
+        }
+        Ok(None)
+    }
+
+    fn next_value_seed<V>(&mut self, seed: V) -> Result<V::Value, Self::Error>
+    where
+        V: DeserializeSeed<'de>,
+    {
+        self.delegate.next_value_seed(seed)
+    }
+}
+
+#[allow(missing_debug_implementations)]
+pub struct WithPrefixOption<'a, T> {
+    first_key: Option<String>,
+    delegate: T,
+    prefix: &'a str,
+}
+
+impl<'de, 'a, V> Visitor<'de> for WithPrefixOption<'a, V>
+where
+    V: Visitor<'de>,
+{
+    type Value = V::Value;
+
+    fn expecting(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
+        self.delegate.expecting(formatter)
+    }
+
+    fn visit_unit<E>(self) -> Result<Self::Value, E>
+    where
+        E: de::Error,
+    {
+        self.delegate.visit_none()
+    }
+
+    fn visit_map<A>(self, mut map: A) -> Result<Self::Value, A::Error>
+    where
+        A: MapAccess<'de>,
+    {
+        while let Some(s) = map.next_key::<String>()? {
+            if s.starts_with(self.prefix) {
+                return self.delegate.visit_some(WithPrefixOption {
+                    first_key: Some(s),
+                    delegate: map,
+                    prefix: self.prefix,
+                });
+            }
+            map.next_value::<IgnoredAny>()?;
+        }
+        self.delegate.visit_none()
+    }
+}
+
+impl<'de, 'a, A> Deserializer<'de> for WithPrefixOption<'a, A>
+where
+    A: MapAccess<'de>,
+{
+    type Error = A::Error;
+
+    fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Self::Error>
+    where
+        V: Visitor<'de>,
+    {
+        visitor.visit_map(self)
+    }
+
+    forward_to_deserialize_any! {
+        bool i8 i16 i32 i64 i128 u8 u16 u32 u64 u128 f32 f64 char str string
+        bytes byte_buf option unit unit_struct newtype_struct seq tuple
+        tuple_struct map struct enum identifier ignored_any
+    }
+}
+
+impl<'de, 'a, A> MapAccess<'de> for WithPrefixOption<'a, A>
+where
+    A: MapAccess<'de>,
+{
+    type Error = A::Error;
+
+    fn next_key_seed<K>(&mut self, seed: K) -> Result<Option<K::Value>, Self::Error>
+    where
+        K: DeserializeSeed<'de>,
+    {
+        if let Some(s) = self.first_key.take() {
+            let without_prefix = s[self.prefix.len()..].into_deserializer();
+            return seed.deserialize(without_prefix).map(Some);
+        }
+        while let Some(s) = self.delegate.next_key::<String>()? {
+            if let Some(without_prefix) = s.strip_prefix(self.prefix) {
+                return seed
+                    .deserialize(without_prefix.into_deserializer())
+                    .map(Some);
+            }
+            self.delegate.next_value::<IgnoredAny>()?;
+        }
+        Ok(None)
+    }
+
+    fn next_value_seed<V>(&mut self, seed: V) -> Result<V::Value, Self::Error>
+    where
+        V: DeserializeSeed<'de>,
+    {
+        self.delegate.next_value_seed(seed)
+    }
+}