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From: Richard Stallman <rms@gnu.org>
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Subject: Re: with-output-to-temp-buffer [Re: reverting CJK input methods]
Date: Tue, 11 May 2004 03:04:07 -0400
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    >> Should erase-buffer in a Customize buffer leave it empty?

    Yes.

    >> The result would be an undesirable confusion.

    In what way could it be confusing?

Doesn't Custom create overlays?  If you erase the buffer,
the overlays will continue to exist; basically, the Custom
mechanism won't know that the buffer is empty.

I think it is better for erase-buffer to get an error
in the Custom buffer.