Adding upstream version 1.64.0+dfsg1.upstream/1.64.0+dfsg1

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

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+[![crates.io](https://img.shields.io/crates/v/typenum.svg)](https://crates.io/crates/typenum)
+[![Build Status](https://github.com/paholg/typenum/actions/workflows/check.yml/badge.svg)](https://github.com/paholg/typenum/actions/workflows/check.yml)
+
+Typenum
+=====
+
+Typenum is a Rust library for type-level numbers evaluated at compile time. It
+currently supports bits, unsigned integers, and signed integers.
+
+Typenum depends only on libcore, and so is suitable for use on any platform!
+
+For the full documentation, go [here](https://docs.rs/typenum).
+
+### Importing
+
+While `typenum` is divided into several modules, they are all re-exported
+through the crate root, so you can import anything contained herein with `use
+typenum::whatever;`, ignoring the crate structure.
+
+You may also find it useful to treat the `consts` module as a prelude, perfoming
+a glob import.
+
+### Example
+
+Here is a trivial example of `typenum`'s use:
+
+```rust
+use typenum::{Sum, Exp, Integer, N2, P3, P4};
+
+type X = Sum<P3, P4>;
+assert_eq!(<X as Integer>::to_i32(), 7);
+
+type Y = Exp<N2, P3>;
+assert_eq!(<Y as Integer>::to_i32(), -8);
+```
+
+For a non-trivial example of its use, see one of the crates that depends on
+it. The full list is
+[here](https://crates.io/crates/typenum/reverse_dependencies). Of note are
+[dimensioned](https://crates.io/crates/dimensioned/) which does compile-time
+type checking for arbitrary unit systems and
+[generic-array](https://crates.io/crates/generic-array/) which provides arrays
+whose length you can generically refer to.
+
+### Error messages
+
+
+Typenum's error messages aren't great, and can be difficult to parse. The good
+news is that the fine folks at Auxon have written a tool to help with it. Please
+take a look at [tnfilt](https://github.com/auxoncorp/tnfilt).
+
+### License
+
+Licensed under either of
+
+ * Apache License, Version 2.0 ([LICENSE-APACHE](LICENSE-APACHE) or
+   http://www.apache.org/licenses/LICENSE-2.0)
+ * MIT license
+   ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
+
+at your option.
+
+### Contribution
+
+Unless you explicitly state otherwise, any contribution intentionally submitted
+for inclusion in the work by you, as defined in the Apache-2.0 license, shall be
+dual licensed as above, without any additional terms or conditions.