[Bug libstdc++/113260] missing from_chars/to_chars for __float128

[g.peterhoff--- via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113260

--- Comment #3 from g.peterh...@t-online.de ---
My problem is that I need from_chars/to_chars for __float128 also for older C++
standards that do not yet support _Float128/std::float128_t.