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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Deleting old `:version` from defcustoms (was: master b76cdd0:
 Delete libraries obsolete since 23.1 and 23.2)
Date: Sun, 17 May 2020 18:18:22 +0300
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To: Stefan Kangas <stefankangas@gmail.com>
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 (message from Stefan Kangas on Sat, 16 May 2020 20:18:54 -0700)
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> From: Stefan Kangas <stefankangas@gmail.com>
> Date: Sat, 16 May 2020 20:18:54 -0700
> 
> I realize I don't fully understand the purpose of the :version
> declarations.  If it's mostly to let users know what changed, they can
> probably be removed for these very old versions.
> 
> But are they also intended to provide a historical record?  If so, maybe
> they should be kept indefinitely.

I think it's good to have a facility that can tell us in which Emacs
version was some option introduced.