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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: undo info for *cvs-tmp*
Date: Wed, 25 Jul 2007 11:02:35 -0400
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Xref: news.gmane.org gmane.emacs.devel:75523

    > I think the value is expected to be t not nil... 

    That might be right.  But nil is still far from "too big".

t means "don't record undo info".  nil means "do record undo info, but
there isn't any yet."  So if it gets set to nil instead of t, that
will cause the unwanted recording of potentially large undo info.