[Bug libstdc++/114862] std::uppercase not applying to nan's and inf's

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114862

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
I've opened https://cplusplus.github.io/LWG/issue4084