Quoting Rick Macklem <rmack...@uoguelph.ca> (from Mon, 19 Sep 2022 20:27:29 +0000):

Hi,

Recently there has been discussion on the NFSv4 IETF working
group email list w.r.t. internationalization for the domain name
it uses for users/groups.

Right now, I am pretty sure the FreeBSD nfsuserd(8) only works
for ascii domain names, but...

I am hoping someone knows what DNS does in this area (the
working group list uses terms like umlaut, which I have never
even heard of;-).

DNS does this:
    https://en.wikipedia.org/wiki/Punycode
This page also shows some umlauts (German ones to be precise, e.g. "Bücher") and other things like chinese and other characters.

There are libs which do the conversation, e.g. https://www.gnu.org/software/libidn/doxygen/index.html
I don't know if there are libs with more preferred licenses.

Bye,
Alexander.

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