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Equivalent to C's `float` type.

This type will almost always be [`f32`], which is guaranteed to be an [IEEE-754 single-precision float] in Rust. That said, the standard technically only guarantees that it be a floating-point number, and it may have less precision than `f32` or not follow the IEEE-754 standard at all.

[IEEE-754 single-precision float]: https://en.wikipedia.org/wiki/IEEE_754