[Python-Dev] Const-correctness in C-API Object Protocol

["Martin v. Löwis"]

> I don't think it's a good idea to backport visible API changes.
> (someone successfully compiling on 2.7.N could then have users
> complaining that compilation fails on 2.7.N-1).

+1. If it was a bug fix (which it isn't), having this kind of breakage
would be fine, of course (i.e. code relying on the bug fix will
reasonably break when used with buggy versions).

Regards,
Martin