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From: "Alfred M. Szmidt" <ams@gnu.org>
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Subject: Re: prettify symbols question
Date: Thu, 12 Nov 2020 15:53:05 -0500
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   > > 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.

   Btw, in what encoding does \210 stand for GREEK SMALL LETTER LAMBDA?

The Lisp Machine character set -- there is a long story that I could
tell about why if anyone is curious but very much a tanget.