Mypy doesn't object to property methods that don't exist

[tungol]

Bug Report

Mypy includes functools.cached_property on it's list of property-list types, but considers it to be too identical to property. It allows the use of cached_property.setter and cached_property.deleter without raising an error, despite the fact that neither of these are methods that exist on cached_property.

I discovered this while looking at permutations of property-like behavior for python/typeshed#13276.

Actually, I realized just now that it can be anything from any of the property types. See the second playground link.

To Reproduce

Playground link showing : https://mypy-play.net/?mypy=latest&python=3.12&gist=f5336c7a8df8f028a565bab576b74062

This one shows that mypy doesn't object to non-existent methods of property used as a decorator:

https://mypy-play.net/?mypy=latest&python=3.12&gist=d91764177a604ba5640a1fe741718f52

class PropertyTest1:
    _value: int | None = None

    @property
    def foo(self) -> int | None:
        return self._value

    @foo.whatever  # No error here
    def foo(self, value: int) -> None:
        self._value = value

Expected Behavior

I expect mypy to generate errors for methods that don't exist in the stubs, even with the special-cased behavior.

Actual Behavior

No errors are generated.