https://eel.is/c++draft/intro.defs#defns.multibyte
" sequence of one or more bytes representing the code unit sequence for an
encoded character of the execution character set"

We're reviewing the draft internally and discussing possible NB comments.
It wasn't clear to one of the reviewers, nor to me, that 'of the execution
character set' is a necessary part of the definition, here. Additionally,
in trying to explain what we mean, it looks like we don't clearly state
what we mean by 'execution character set', although I think we have a clear
understanding that it's how the library interprets text and is controlled
by locale. Should we actually define it as part of defns?

I thought it worthwhile to bring this up now before bringing it up in an NB
comment, though.

Thoughts?