and not lenient_issubclass(first_field.type_, BaseModel)
        and not is_union_of_base_models(first_field.type_)
    ):
        return True
    return False


async def _extract_form_body(
    body_fields: list[ModelField],
    received_body: FormData,
) -> dict[str, Any]:
    values = {}

    for field in body_fields:
        value = _get_multidict_value(field, received_body)