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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: un-deprecating CL
Date: Fri, 21 Sep 2007 18:32:58 -0400
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To: Stefan Monnier <monnier@IRO.UMontreal.CA>
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In-reply-to: <jwv6425w5fy.fsf-monnier+emacs@gnu.org> (message from Stefan
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Xref: news.gmane.org gmane.emacs.devel:79468
Archived-At: <http://permalink.gmane.org/gmane.emacs.devel/79468>

    > As for mapcar, it is pretty slow already, and the main cost is in
    > calling the user's function.  That won't get any slower.

    Then again: how many uses of mapcar* have you encountered?
    If you object to `union' because it's not used often, I'd expect you to
    reject the vararg version of mapcar.

The issues are not similar.  One is adding a new function.
The other is a simple, natural extension in an existing function.
The former costs more, in complexity.