from typing import TypedDict

class BaseConfig(TypedDict):
    values: list[str]  # `items` have the same issue

class ExtendedConfig(BaseConfig):
    version: int

def foo(x: BaseConfig) -> None: ...
def test(x: ExtendedConfig) -> None:
    foo(x)  # FP: Argument `ExtendedConfig` is not assignable to parameter `x` with type `BaseConfig` in function `foo`
    x.values  # FP: Object of class `ExtendedConfig` has no attribute `values