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      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.