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I see that every other comparison operator (<, >, <=, >=, ==, !=) except for `is` work the way I expect and is able to return anything.
e.g.
>>> numpy.arange(5) < 3
array([ True, True, True, False, False], dtype=bool)
I didn't checked the code (and probably I'm talking nonsense), but seems like the `in` operator has an extra call to `PyObject_IsTrue` that maybe could be dropped?
Of course it can break code relying on `x in y` being True/False but it would only happen on customized classes.
Another option that won't break code is to add a different method to handle these cases. Something like "__contains_non_bool__", but that'd be a big api change.