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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Additional safe-local-variables
Date: Thu, 06 Apr 2006 22:19:46 -0400
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    I added it to `subr.el' in the "Misc. useful functions." part:

    (defun string-or-null-p (object)
      "Return t if OBJECT is a string or nil.
    Otherwise, return nil."
      (or (stringp object) (null object)))

defun is best here, I think; we are not concerned about speed.

Could you please add this to NEWS and the Lisp Manual?