Fast & exact implementation of C++ from_chars for float/double
Description
The fast_float library provides fast header-only implementations for the C++
from_chars functions for float and double types. These functions convert ASCII
strings representing decimal values (e.g., 1.3e10) into binary types. We
provide exact rounding (including round to even). In our experience, these
fast_float functions many times faster than comparable number-parsing functions
from existing C++ standard libraries.
