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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: proposal to make null string handling more emacs-y
Date: Wed, 25 Apr 2012 11:22:58 +0300
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To: Steve Yegge <steve.yegge@gmail.com>
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> Date: Tue, 24 Apr 2012 17:24:57 -0700
> From: Steve Yegge <steve.yegge@gmail.com>
> 
> I think we should change all the core string-manipulation functions to deal
> gracefully with nil arguments.  Specifically, I want to change the smallest
> set of functions that may originate the infamous "wrong-type-argument
> (stringp, nil)" error, making them instead treat nil as if it were the
> empty string.

I'm quite sure this will break gobs of existing code in Emacs.  The
entire display engine, for starters.