def __getstate__(self):
        state = super().__getstate__()
        # Don't recurse when getting a pickle-able dictionary in case any of
        # our attributes is also an @attr.s and we want to retain its
        # object nature, instead of turning it into a dictionary which
        # can't be unpickled correctly.
        state.update(attr.asdict(self, recurse=False))
        return state

    def __setstate__(self, state):
        super().__setstate__(state)
        for field in attr.fields(self.__class__):
            setattr(self, field.name, state.get(field.name, field.default))