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From: Stefan Monnier <monnier@iro.umontreal.ca>
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Subject: Re: Obtaining a database of new functionality per Emacs version
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Xref: news.gmane.io gmane.emacs.devel:260512
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>> 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.

I just tried it with Emacs's `master` and `C-h o seq-first RET` tells me:

    seq-first is a compiled Lisp function in =E2=80=98seq.el=E2=80=99.
=20=20=20=20
    (seq-first SEQUENCE)
=20=20=20=20
      Other relevant functions are documented in the sequence group.
      Probably introduced at or before Emacs version 27.1.
=20=20=20=20
    Return the first element of SEQUENCE.


-- Stefan