__getnewargs__ for a subclass incompatible with return type of supertype

Here is an example commit with the issue: https://github.com/eli-schwartz/meson/commit/4d204bb81869422a102264611d9aea314a1ac2ca

mypy.ini: https://github.com/mesonbuild/meson/blob/27626124d0bdd89f5f276f70a73b4713aa3aac3d/.mypy.ini

$ mypy --version
mypy 0.961 (compiled: yes)

$ mypy mesonbuild/interpreter/primitives/string.py
mesonbuild/interpreter/primitives/string.py:211:5: error: Return type "Tuple[str, str]" of "__getnewargs__" incompatible with return type "Tuple[str]" in supertype "str"

I subclassed str and treat it specially with its own incompatible __new__() to enforce a specific creation pattern. After discovering I need to pickle it as well, I added a __getnewargs__() which is also incompatible. mypy is happy with my incompatible new, but not with the getnewargs that needs to match the argument contract of new.

Reproduisez le rapport avec mypy 0.961 en utilisant mesonbuild/interpreter/primitives/string.py et la configuration .mypy.ini indiquée par le lien. Examinez comment les signatures de new et getnewargs de la sous-classe sont vérifiées par rapport à str, puis vérifiez que le cas pickle prévu est géré sans le diagnostic de retour incompatible signalé.