Should `object.__eq__` return `object`?

[kmillikin]

In builtins.pyi there is:

def __eq__(self, __o: object) -> bool: ...
def __ne__(self, __o: object) -> bool: ...

But I think that both of these methods should return object. I believe that they eventually get called in CPython by tp_richcompare which doesn't necessarily return bool (https://github.com/python/cpython/blob/1626bf4ac7aef1244e6f886e63a31f7ed65fbd10/Objects/object.c#L655).

There is Python code that takes advantage of this to override == to return something other than a bool (e.g., numpy arrays). Type checking code like that against the typeshed type stubs leads to incompatible overrides (e.g., numpy array is not a subtype of bool).

Should these methods be annotated as returning object?

[srittau]

See #3685.