Comment by jhasse

Of course it can be made UTF-8. Just add a codepoints_size() method and other helpers.

But it isn't really needed anyway: I'm using it for UTF-8 (with helper functions for the 1% cases where I need codepoints) and it works fine. But starting with C++20 it's starting to get annoying because I have to reinterpret_cast to the useless u8 versions.