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

[redi at gcc dot gnu.org]

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

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2025-12-10
     Ever confirmed|0                           |1

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Jan Schultke from comment #1)
> roundTiesToEven has no exception that would apply here, and
> https://eel.is/c++draft/charconv.from.chars#lib:from_chars specifies that
> round_to_nearest is to be used, which is intended to mirror those ISO/IEC
> 60559 modes.

It's says "closest" but it's not clear that it means round_to_nearest.

This is https://cplusplus.github.io/LWG/issue3082