Loads/dumps container
        :return:

async def container(self, container=None, container_type=None, params=None):
        """
        Loads/dumps container
        :return:
        """
        # Container versioning is a bit tricky, primitive type containers are not versioned.
        elem_type = x.container_elem_type(container_type, params)
        raw_container = container_is_raw(container_type, params)
        elem_elementary = TypeWrapper.is_elementary_type(elem_type)
        is_versioned = not elem_elementary and not raw_container
        version = None

        if is_versioned:
            version = await self.version(container_type, params, elem=container)
            if self.is_tracked():
                return self.get_tracked()

        if hasattr(container_type, 'boost_serialize'):
            container = container_type() if container is None else container
            self.pop_track(is_versioned)
            return await container.boost_serialize(self, elem=container, elem_type=container_type, params=params, version=version)

        # Container entry version + container
        if self.writing:
            self.pop_track(is_versioned)
            return await self.container_dump(container, container_type, params)
        else:
            obj = await self.container_load(container_type, params=params, container=container)
            return self.track_obj(obj, is_versioned)