Class Iterable

tests/test_codecs.py:844–849

        # A sized iterable is fine as array input.
        class Iterable:
            def __iter__(self):
                return iter([1, 2, 3])

            def __len__(self):
                return 3

        result = await self.con.fetchval("SELECT $1::int[]", Iterable())
        self.assertEqual(result, [1, 2, 3])