bug#71370: 30.0.50; Please un-obsolete buffer-substring as a generalized variable

[Ihor Radchenko]

Michael Heerdegen via "Bug reports for GNU Emacs, the Swiss army knife
of text editors" <bug-gnu-emacs@gnu.org> writes:

> Any arguments why this gv is different from the others that had been
> deprecated?

It is one of the commonly used gvs.
https://github.com/search?q=%22%28setf+%28buffer-substring%22&type=code
gives 500+ hits (and it is not all forks of one or two popular packages)

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