On Jul 9, 2024 at 10:07:44 AM, "Salz, Rich" <rsalz=
40akamai....@dmarc.ietf.org> wrote:

> UTF8 is upward compatible with ASCII.  That is, all seven-bit ASCII
> characters are valid UTF8 characters.
>

I don’t want to be pedantic here (sigh, anything involving Unicode always
becomes pedantic) but Rich, it wouldn’t actually be a good idea to require
“UTF-8”. What you want to require is UTF-8 encoded Unicode characters, and
probably not all of them.  PRECIS in RFC8264 provides a
fully-thought-through subset of Unicode for identifiers. If that’s too
complicated, https://www.ietf.org/archive/id/draft-bray-unichars-09.html,
now under AD sponsorship by Orie, provides a much simpler but still useful
subset.
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