bug#51930: 27.2; Buffer-local functions? Buffers specified buffer-locally?

[Eli Zaretskii]

> From: Drew Adams <drew.adams@oracle.com>
> CC: "51930@debbugs.gnu.org" <51930@debbugs.gnu.org>
> Date: Tue, 20 Sep 2022 15:58:25 +0000
> 
> > I think the section is clear after that clarification, so I'm closing
> > this bug report.
> 
> Nope, it's not clear.  The doc of `add-hook' does
> not at all talk about buffer-local functions.

What are "buffer-local functions"?  I'm not aware of such a feature in
Emacs.  The documentation of add-hook doesn't mention any
"buffer-local functions".

The node "Windows Hooks" uses the phrase "Functions specified
buffer-locally", after it explains that hooks can have buffer-local or
global values.  I see no problem with that.