types compare as not-equal (e.g. np.int32 != np.int32)

From https://dev.azure.com/pandas-dev/pandas/_build/results?buildId=18674
```
>           assert res_type == ex_type
E           AssertionError: assert <class 'numpy.int32'> == <class 'numpy.int32'>
```

I've also seen this for `assert np.uint64 == np.uint64` failing.  Is this behavior intentional?