bug#63513: [PATCH] Make persist-defvar work with records and hash tables

[Stefan Monnier]

>>> Here you go!
>> Thanks, pushed!
> May it be possible to promote `persist-hash-equal' and
> `persist-copy-tree' to common subr.el functions?
> The topic of comparing hash tables has been previously discussed in
> https://yhetil.org/emacs-devel/871qvz4kdw.fsf@localhost/

Hmm... AFAICT `persist-copy-tree` is a copy of our current `copy-tree`,
so there's nothing to do there :-)

As for `persist-hash-equal` (which is actually called `persist-equal`,
AFAICT), I think if we want to move it out of `persist.el` we need to
improve it so it also looks inside hash-tables that occur within
vectors, conses, etc...

Maybe, like Sam Steingold suggested, we should simply consider the
current treatment of `equal` on hash-tables to be a bug.


        Stefan