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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: prettify symbols question
Date: Thu, 12 Nov 2020 17:38:12 +0200
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> From: "Alfred M. Szmidt" <ams@gnu.org>
> Cc: emacs-devel@gnu.org
> Date: Thu, 12 Nov 2020 10:17:05 -0500
> 
>    If the above doesn't work, then maybe it _is_ related to encoding.
>    What does the mode line say about 'buffer-file-coding-system when' you
>    visit this file?
> 
> So when the buffer-file-coding-system is utf-8-unix everything works
> (where also the sequence is not acted on in comments).  But when the
> buffer is raw-text-unix, it does not work for #o210, but works for say
> #o10.  Some multi-byte thing going on?

Yes, raw-text means the buffer includes raw bytes, not characters.
Emacs doesn't do anything useful with raw bytes above 127, and in
particular doesn't interpret them as characters.