result = v2.serialize_sequence_value(field=field, value=["a", "b", "c"])
    assert result == ["a", "b", "c"]
    assert isinstance(result, list)


def test_serialize_sequence_value_with_none_first_in_union():
    """Test that serialize_sequence_value handles Union[None, List[...]] correctly."""
    from typing import Union

    from fastapi._compat import v2