[Bug libstdc++/123078] std::from_chars handles signedness of zero in underflow inconsistently with floating-point literals

[janschultke at googlemail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123078

--- Comment #2 from Jan Schultke <janschultke at googlemail dot com> ---
https://godbolt.org/z/7Mcaz7KqK