29 mars 2024 kl. 12.38 skrev Daniel Mendler <mail@daniel-mendler.de>:

> I would
> like to back-port the new feature in the Compat library, specifically in
> the emacs-30 branch of the Compat repository. I've seen you mentioned
> some pure Lisp code, implementing the new feature, in a slower, but
> backward compatible way, which we could perhaps use?

Here is my proof-of-concept hack that maybe you could use as starting point. It's incomplete but I think you can fill in the blanks. You could use the tests in fns-tests.el, perhaps adapted to fit. Let us know how it goes.