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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Obtaining a database of new functionality per Emacs version
Date: Mon, 07 Dec 2020 20:20:58 +0200
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To: Vasilij Schneidermann <mail@vasilij.de>
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In-Reply-To: <X85wQY3+ZoaeaeW0@odonien.localdomain> (message from Vasilij
 Schneidermann on Mon, 7 Dec 2020 19:11:13 +0100)
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> Date: Mon, 7 Dec 2020 19:11:13 +0100
> From: Vasilij Schneidermann <mail@vasilij.de>
> Cc: emacs-devel@gnu.org
> 
> > The version info displayed in `C-h o` comes from the NEWS files.
> > It's indeed approximate but I've found it surprisingly usable so far.
> 
> Hm, I couldn't find any evidence of it using it for functions, for
> example `seq-first` which according to NEWS has been added in 27.1.

Try some older function.  AFAICT, if you "C-h f" for a function that
was added in the release in which you do that, the version information
is not displayed, it is only displayed for functions introduced in
older versions.