Link to paper: https://thephd.dev/_vendor/future_cxx/papers/d1967.html

Quote from proposed wording:

> Additionally, an array of ordinary character type may be initialized by a
> UTF-8 string literal, or by such a string literal enclosed in braces.
> Successive characters of the value of the string-literal initialize the
> elements of the array.
>

The wording does not address the case of UTF-8 code units in the value of
the u8 string literal with numerical values that exceed the range of values
representable by signed char.