[3.14] gh-144330: Initialize classmethod and staticmethod in new

[vstinner]

Initialize cm_callable and sm_callable to None in classmethod and staticmethod constructor.

• Issue: classmethod and staticmethod can crash with NULL / uninitialized callables #144330

[vstinner]

"Tests / Change detection / Create context from changed files" fails with:

+ git fetch origin +f27896c3191c5ffd85a62ac89a98f72fb14d9c61:remotes/origin/3.14 '--shallow-since=2026-02-05 12:04:04 +0100' --no-tags --prune --no-recurse-submodules
fatal: error processing shallow info: 4

I don't know why.

[StanFromIreland]

Maybe a GH outage, it sets github.event.pull_request.commits: 0 causing the error. I suggest trying to re-run in a bit.

[sergey-miryanov]

I hope you don't mind if I ask :)
You did simpler version of 3.13 and 3.14 because #144469 changes user-observable behavior and that change considered as a feature?

[StanFromIreland]

I tried it again, still github.event.pull_request.commits is 0. Maybe the have some internal corruption, @webknjaz have you seen this before? I'll try updating the branch, that'll (theoretically) change the number and jog the data.

Edit: that worked, though I still wonder why it occurred in the first place... GitHub doing its thing 🙃