R0201 false positives

[MatthijsBlom]

The following five valid special method names produce R0201 Method could be a function warnings.

class C:
    def __pow__(self, other, modulo): return NotImplemented
    def __imatmul__(self, other): return NotImplemented
    def __trunc__(self): return NotImplemented
    def __floor__(self): return NotImplemented
    def __ceil__(self): return NotImplemented

Of these five, __pow__ and __imatmul__ also produce W0613 Unused argument warnings.

As far as I can tell, there are no other special method names that are not recognized as such.

I am currently looking into fixing this myself and may send a pull request in the near future.