Class myint

Lib/test/test_long.py:1532–1533

        check(tests4, 'little', signed=False)

        class myint(int):
            pass

        self.assertIs(type(myint.from_bytes(b'\x00', 'big')), myint)
        self.assertEqual(myint.from_bytes(b'\x01', 'big'), 1)