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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: non-ASCII characters in auto-save files
Date: Wed, 27 Jun 2012 19:44:13 +0300
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> From: Xah Lee <xahlee@gmail.com>
> Date: Wed, 27 Jun 2012 04:52:41 -0700 (PDT)
> 
> i thought emacs 23/24 uses a superset of utf-8 as internal encoding?

It does.

> so that i thought those #autosave# files are encoded in utf-8, and as
> long as one open them with utf-8 decoding all chars would show. Is
> this not correct?

Not 100%, because it's a superset.  That is, there could be codes
there that UTF-8 will fail to decode.