https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113386
--- Comment #7 from Jan Schultke <janschultke at googlemail dot com> --- I've noticed that too by now. What confuses me is that both libc++ and MSVC STL implement it as if it was a DR, so transparent comparisons work even outside C++23 mode. Is it just a collective mistake, or what's going on with that? What would be the right way to implement it in libstdc++ then?
