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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Integer & glyph (trunk and emacs_unicode)
Date: Fri, 16 Nov 2007 23:53:29 -0500
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To: Vinicius Jose Latorre <viniciusjl@ig.com.br>
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	(let ((id (and face (face-id face))))
	  (if (and (numberp id)
		   ;; Due to limitations on Emacs integer values, only
		   ;; face ids below a certain limit can be used.
		   (= id (lsh (lsh id glyph-char-bits) (- glyph-char-bits))))
	      (logior char (lsh id glyph-char-bits))
	    char))

    Is there any problem if I implement this solution in trunk and Emacs 
    unicode?

It's not _wrong_, but we've already decided to replace the
mechanism with the use of cons cells.

And I am pretty sure someone has already written the code for that.
Who was it?