## Long story short `CIMultiDict().get("str")` fails in mypy ## Expected behaviour ```python import multidict a = multidict.CIMultiDict({"a": "b"}) a.get("Hey") ``` Should pass in mypy ## Actual behaviour ``` foo.py:5: error: No overload variant of "get" of "Mapping" matches argument type "str" foo.py:5: note: Possible overload variants: foo.py:5: note: def get(self, key: istr) -> Optional[str] foo.py:5: note: def [_T] get(self, istr, Union[str, _T]) -> Union[str, _T] ``` ## Steps to reproduce Write the above code in foo.py, run `mypy foo.py` with the most recent multidict & mypy ## Your environment Python 3.8.10 ``` mypy==0.931 multidict==6.0.1 ```