P2510R3 Formatting Pointers #3799

WG21-P2510R3 Formatting Pointers

INCREASED feature-test macro, note that __cpp_lib_format has repeatedly increased through 202304L (#3799 WG21-P2510R3), 202305L (#3813 WG21-P2757R3), 202306L (#3808 WG21-P2637R3), 202603L (#4181 WG21-P2918R2):

#define __cpp_lib_format 202304L // <== NOTE SPECIAL VALUE

After talking with libc++ and libstdc++'s maintainers, we've all agreed to implement this unconditionally down to C++20 mode, so we will accept PRs for this feature.