I'm not sure why I added this, though removing it doesn't seem to
casue any issues. I suspect there might be some oddness if the type
being passed in doesn't match the type expected, though them having
the same number of generic paramters isn't an expecially great way
to validate that.
This mostly works for the new tests, but doesn't work for:
- tuples (though this seems to be because they lack generic information anyway)
- nested Type[T] handling (e.g: List[Type[T]])
While these definitely _ought_ to work on Python 2.7, the annotation
support there is very limited and as Python 2 is deprecated it
doesn't seem worth it.