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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Should undefined behavior be encouraged in Emacs?
Date: Mon, 03 Oct 2011 05:53:36 -0400
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> From: Andreas Schwab <schwab@linux-m68k.org>
> Date: Mon, 03 Oct 2011 10:29:10 +0200
> Cc: Emacs Development <emacs-devel@gnu.org>
> 
> I don't think Emacs should have undefined behaviour.  It may have
> unspecified behaviour (ie. it may change any time), but the result
> should always be consistent with the documented rules.

That might be a good goal, but I think it is practically unreachable.