IDN with Gemini?

[Stephane Bortzmeyer]

On Sun, Dec 06, 2020 at 11:27:11PM +0000,
 colecmac at protonmail.com <colecmac at protonmail.com> wrote 
 a message of 18 lines which said:

> > However, I was under the impression that precomposed characters
> > are no longer supposed to be used, am I horribly wrong?
> 
> I don't know about that, but I hope that's true.

Quite the contrary. RFC 5198 mandates NFC, which maps many characters
to the precomposed form.