(🐞) Check __setitem__ and __getitem__ for TypedDicts

[KotlinIsland]

from typing import TypedDict

class A(TypedDict):
    x: int
a: A
a.__setitem__('x', '')  # no error
b: int = a.__getitem__('x')  # error: Incompatible types in assignment (expression has type "object", variable has type "int")

[jhance]

What is the purpose of supporting this? How often do people really use foo.__getitem__("x") instead of foo["x"]?