Fastest floating-point typedefs

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## Fastest floating-point `typedef`s

The `typedef float_fast#_t`, with # replaced by the width, designates the fastest floating-point type with a width of at least # bits.

There is no absolute guarantee that these types are the fastest for all purposes. In any case, however, they satisfy the precision and width requirements.

Fastest minimum-width floating-point types are provided for all existing exact-width floating-point types on a given platform.

For example, if a platform supports `float32_t` and `float64_t`, then `float_fast32_t` and `float_fast64_t` will also be supported, etc.