try and use named arguments from caller for matching name

[asottile]

test failing prior to change:

__________________ nullable_foreign_key_with_init_overridden ___________________
/home/asottile/workspace/django-stubs/tests/typecheck/fields/test_related.yml:806: 
E   pytest_mypy_plugins.utils.TypecheckAssertionError: Invalid output: 
E   Actual:
E     main:2: note: Revealed type is "myapp.models.B" (diff)
E   Expected:
E     main:2: note: Revealed type is "Union[myapp.models.B, None]" (diff)
E   Alignment of first line difference:
E     E: ...te: Revealed type is "Union[myapp.models.B, None]"
E     A: ...te: Revealed type is "myapp.models.B"
E                                 ^

the FK example matches a similar one in sentry

[asottile]

one could imagine a perverse class that does something like:

class FK(ForeignKey[_ST, _GT]):
   def __init__(self, *args, **kwargs):
       kwargs['null'] = not kwargs.get('null', False)
       super().__init__(*args, **kwargs)

but I'm thinking that's probably not going to happen and possibly ok to ignore?

[asottile]

I guess they could even do that today and trick the current code with:

class FK(ForeignKey[_ST, _GT]):
    def __init__(self, *args, null: bool = False, **kwargs):
        null = not null
        super().__init__(*args, null=null, **kwargs)

so definitely not a problem imo :)

[sobolevn]

What do you think about reusing _get_argument from mypy.plugins.common? Would it solve this problem?

[asottile]

I think the current code is equivalent to that so it wouldn't help (_get_argument only looks at callee args)

[sobolevn]

Thanks!