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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: t and nil in pure memory?
Date: Thu, 19 Nov 2009 11:23:27 -0500
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To: Stefan Monnier <monnier@iro.umontreal.ca>
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In-reply-to: <jwvhbsrj0gu.fsf-monnier+emacs@gnu.org> (message from Stefan
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    There are *many* ways for the user to shoot herself in the foot and make
    her Emacs session completely unusable.

We won't try all, but it is useful to catch some.  unintern is not
used a lot, so don't worry about the cpu time.