Subject: bug#65797: 29.0.92; func-arity should not return (0 . many) with apply-partially

From: Stefan Monnier <[email-masked]>
Date: Fri, 08 Sep 2023 11:52:25 -0400

>> This isn't backwards compatible, is it?
> Neither is what you propose, AFAIU.  We are in effect changing a
> public API in incompatible ways.

Yup, AFAICT there's no way to implement the Texinfo-documented
behavior reliably.

So some backward-incompatibility is inevitable, unless we decide to
stick to the current code to be "bug compatible" :-(

        Stefan