The std::char module defines functions that could be instead associated methods of the char type (e.g., decode_utf16). Making them associated to the char type allows to use directly char::method instead of std::char::method. Similarly, the std::char::MAX and std::char::REPLACEMENT_CHARACTER could also be associated constants (like done with integer constants in #68952).
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std::charmodule defines functions that could be instead associated methods of thechartype (e.g.,decode_utf16). Making them associated to thechartype allows to use directlychar::methodinstead ofstd::char::method. Similarly, thestd::char::MAXandstd::char::REPLACEMENT_CHARACTERcould also be associated constants (like done with integer constants in #68952).