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From: Richard M Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: No coding system in the modeline for unibyte buffers.
Date: Sat, 17 Jan 2009 12:03:52 -0500
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    >         * xdisp.c (decode_mode_spec_coding): If multibyte chars disabled.
    >         display only the eol flag.

    > But, why?

    So as to indicate if the buffer is unibyte or multibyte?

That is one reason.  Also, displaying them when they are
meaningless could mislead people.