[Bug libstdc++/116399] C++26 text_encoding​::​aliases_view is not default-constructible

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116399

--- Comment #12 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Implementation-defined means the implementation must define it (and document
it).

If the implementation says the types are different, then they're different, and
it's not a common range.