def set_to_first(self):
        self._address = (self._address & self._mask) + 1
        return self
Field Test for when Blank, Empty Default, Null & Unique
dataset/ETHPy150Open kdart/pycopia/core/pycopia/ipv4.py/IPv4.set_to_first--crossover with--dataset/ETHPy150Open stefanfoulis/django-phonenumber-field/testproject/testapp/tests.py/PhonenumerFieldAppTest.test_save_unique_null_blank_default_empty_phone_to_database