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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: string-to-unibyte in image-jpeg-p
Date: Fri, 25 May 2018 09:10:19 +0300
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To: Stefan Monnier <monnier@iro.umontreal.ca>
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In-reply-to: <jwvr2m0kf2k.fsf-monnier+gmane.emacs.devel@gnu.org> (message from
	Stefan Monnier on Thu, 24 May 2018 15:51:48 -0400)
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> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Date: Thu, 24 May 2018 15:51:48 -0400
> 
> > +(make-obsolete 'image-jpeg-p nil "27.1")
> 
> Nowadays I'd recommend the use of (declare (obsolete nil "27.1"))

Why?  What are the factors to consider?