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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: [trentbuck@gmail.com: RFE: (put 'conf-space-keywords
	'safe-local-variable 'stringp)]
Date: Tue, 23 Oct 2007 13:53:34 -0400
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    Is an arbitrary regexp "safe"? I imagine one could construct a
    regexp/file combination that overflows the regexp matcher. Not too
    serious, but perhaps it is best to leave this unmarked?

The worst that can do is cause a Lisp error.  We can consider it safe.
Please do add that property.