bug#62621: 29.0.60; uniquify can't make buffers unique based on things other than filename

[Eli Zaretskii]

> From: Spencer Baugh <sbaugh@janestreet.com>
> Cc: sbaugh@catern.com,  62621@debbugs.gnu.org
> Date: Fri, 14 Jul 2023 10:14:39 -0400
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > And I don't really understand how this will work in practice: if the
> > user-defined function is supposed to be in effect only for buffers
> > under project.el,
> 
> The transform is supposed to be in effect for all buffers, and
> internally it runs some code to decide whether to change the buffer
> name.

Still unclear why you thought functions can do what other values
cannot.

> > how is this different from using symbols?
> 
> I can't contrast that to "using symbols" because I just don't understand
> what you mean by "using symbols".

It means the defcustom's value is a symbol, like 'numbered or
'append-directory, not a function.