From mboxrd@z Thu Jan  1 00:00:00 1970
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From: Stefan Monnier <monnier@iro.umontreal.ca>
Newsgroups: gmane.emacs.help
Subject: Re: non-ASCII characters in auto-save files
Date: Wed, 27 Jun 2012 21:07:07 -0400
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> that's interesting. What's some examples? e.g. What chars in emacs's
> encoding that's different from utf-8 encoding? I've been wondering why
> it needs to be a superset.

The most obvious unavoidable ones are the chars that represent bytes.
So if you read a utf-8 file which has some invalid byte sequence, Emacs
will be able to save it back unchanged (in the buffer, the invalid
sequence is represented by the corresponding sequence of "byte chars").


        Stefan