Re: Disambiguate modeline character for UTF-8?

[Eli Zaretskii]

> From: Ulrich Mueller <ulm@gentoo.org>
> Cc: Eli Zaretskii <eliz@gnu.org>,  eggert@cs.ucla.edu,  emacs-devel@gnu.org
> Date: Fri, 07 Jul 2023 11:44:51 +0200
> 
> > Not that I expect this to happen in practice anyway, since UTF-7 is
> > rarely encountered nowadays.
> 
> Yes, and when users encounter that rare case, they should get an
> indication that the file they are visiting is in an unusual encoding.

We don't have a notion of "unusual" encoding in Emacs.  Basically,
anything besides ASCII and perhaps UTF-8 is "unusual" nowadays, so
such a notion won't be useful, IMO.

How is utf-7 more "unusual" than, say, ebcdic or iso-2022-jp or even
windows-1251?