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From: Richard Stallman <rms@gnu.org>
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Subject: Re: iso-8859-1 and non-latin-1 chars
Date: Wed, 11 Dec 2002 15:39:47 -0500
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    > If you specify a coding system with C-x RET c, and it doesn't
    > handle all the text, should Emacs warn about that?

    I don't think so.  That would amount to a significant overhead on all
    i/o, since C-x RET c just amounts to binding
    coding-system-for-{read,write} around the invocation of the command.

It could also bind a flag saying "do warn".