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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: prettify symbols question
Date: Fri, 13 Nov 2020 10:40:41 +0200
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> From: "Alfred M. Szmidt" <ams@gnu.org>
> Cc: emacs-devel@gnu.org
> Date: Fri, 13 Nov 2020 03:27:17 -0500
> 
>    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.
> 
> Do you have any ideas on what a good coding system would be for this?
> utf-8 is obviously wrong.  The char. set is just 8-bit, or should I
> write a coding system?

The latter, IMO.  More accurately, define a charset, and then defining
a coding-system for it should be almost trivial.