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From: Richard Stallman <rms@gnu.org>
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Subject: Re: Different (buffer-file-)coding-systems for different regions of
 one buffer? (for Rmail MIME)
Date: Thu, 22 May 2003 04:33:10 -0400
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    > Is it possible to have different (buffer-file-)coding-systems for
    > different regions of one buffer?

    As buffer-file-coding-system is a coding system to use on
    writing a buffer to a file, I think it's nonsense to have
    different values in different regions.

He's not asking what's implemented today, he is asking what might
potentially be implemented.  As an idea for future features,
the idea isn't nonsense.