def test_proxy_contains(self):
        class Thing(mapping.Document):
            numbers = mapping.ListField(mapping.DecimalField)
        thing = Thing(numbers=[Decimal('1.0'), Decimal('2.0')])
        assert isinstance(thing.numbers, mapping.ListField.Proxy)
        assert '1.0' not in thing.numbers
        assert Decimal('1.0') in thing.numbers
dataset/ETHPy150Open djc/couchdb-python/couchdb/tests/mapping.py/ListFieldTestCase.test_proxy_contains/original