Return an _AggregateConverter for named tuples of the given type.

def _named_tuple_converter(tuple_type):
    # type: (Type[Tuple]) -> _AggregateConverter
    """Return an _AggregateConverter for named tuples of the given type."""
    def _from_dict(dict_value):
        if dict_value:
            return tuple_type(**dict_value)

        # Cannot construct a namedtuple value from an empty dictionary
        return None

    def _to_dict(value):
        if value:
            return value._asdict()

        return {}

    converter = _AggregateConverter(from_dict=_from_dict, to_dict=_to_dict)
    return converter