'If the type of the value of a ``PSet`` is the same, but it has
internally changed then the output changes.'

def test_pset_value_type_changed(self):

    class Different(CheckedPSet, ):
        __type__ = Subtype
    Original = Different
    class Different(CheckedPSet, ):
        __type__ = ChangedSubtype
    self.assert_catches_changes(Original, Different)
