def METHOD_NAME(self) -> None:
    h1 = Hasher()
    h1.update({'a': 17, 'b': {'c': 1, 'd': 2}})
    h2 = Hasher()
    h2.update({'a': 17, 'b': {'c': 1}, 'd': 2})
    assert h1.hexdigest() != h2.hexdigest()