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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: User-reserved element in byte code vectors
Date: Tue, 18 May 2004 10:53:07 -0400
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    On the other hand, I'm not sure it's really better than omitting the slot
    now, and later adding a `super-curry' funvec-kind that has the slot -- code
    that cares about funvec layout would have to be amended to deal with non-nil
    values of the slot anyay, so making it understand `super-curry' isn't much
    different, right?

If we add this feature, such funvec objects will probably get written
into files, or otherwise saved.  It would be better to avoid
changing the format incompatibly.