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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: User-reserved element in byte code vectors
Date: Sat, 22 May 2004 03:31:54 -0400
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    >        (let ((env (vector 0)))
    > 	 (curry env (lambda (env) (aset env 0 (+ (aref env 0) 1)))))

Wouldn't it be better to add an env slot to byte-compiled functions?
No matter how the code implements that, it ought to be somewhat faster.