CheckRegistry().register() should allow *tags when called as function

[jwhitlock]

Bug report

The type hints for CheckRegistry.register do not allow passing tags when calling as a function:

django-stubs/django-stubs/core/checks/registry.pyi

Lines 40 to 47 in edfebe4

	class CheckRegistry:
	registered_checks: set[_ProcessedCheckCallable]
	deployment_checks: set[_ProcessedCheckCallable]
	def __init__(self) -> None: ...
	@overload
	def register(self, check: _C, /) -> _ProcessedCheckCallable[_C]: ...
	@overload
	def register(self, *tags: str, **kwargs: Any) -> Callable[[_C], _ProcessedCheckCallable[_C]]: ...

What's wrong

According to the System check framework docs, these (annotated) variants should be equivalent:

from typing import Any, Sequence, Optional, Union, List
from django.apps.config import AppConfig
from django.core.checks import register, Tags, messages


@register(Tags.security)
def my_check_decorated(
    app_configs: Union[Sequence[AppConfig], None], **kwargs: Any
) -> List[messages.Warning]:
    return []


def my_check(
    app_configs: Union[Sequence[AppConfig], None], **kwargs: Any
) -> List[messages.Warning]:
    return []


register(my_check, Tags.security)

However, the second version does not pass mypy:

example.py:20: error: No overload variant matches argument types "Callable[[Sequence[AppConfig] | None, KwArg(Any)], list[Warning]]", "str"  [call-overload]
example.py:20: note: Possible overload variants:
example.py:20: note:     def [_C <: _CheckCallable] register(self, _C, /) -> _ProcessedCheckCallable[_C]
example.py:20: note:     def register(self, *tags: str, **kwargs: Any) -> Callable[[_C], _ProcessedCheckCallable[_C]]

How is that should be

The second version should be accepted. This way, register() can be called in AppConfig.ready(), such as in https://github.com/mozilla/django-csp/blob/main/csp/apps.py.

System information

• OS:
• python version: 3.12.3
• django version: 5.0.6
• mypy version: 1.8.0 (compiled: yes)
• django-stubs version: 5.0.2
• django-stubs-ext version: 5.0.2