def METHOD_NAME(self, nums1: Set[int], nums2: Set[int]) -> None:
    nb1 = nums_to_numbits(nums1)
    good_numbits(nb1)
    nb2 = nums_to_numbits(nums2)
    good_numbits(nb2)
    nbu = numbits_union(nb1, nb2)
    good_numbits(nbu)
    union = numbits_to_nums(nbu)
    assert nums1 | nums2 == set(union)