slackbuilds/libraries/fast_float

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.