code: async def dump_container(obj, container, container_type, params=None, field_archiver=None):
      
      field_archiver = field_archiver if field_archiver else dump_field
      elem_type = params[0] if params else None
      if elem_type is None:
          elem_type = container_type.ELEM_TYPE
  
      obj = [] if obj is None else get_elem(obj)
      if container is None:
          return None
      for elem in container:
          fvalue = await field_archiver(None, elem, elem_type, params[1:] if params else None)
          obj.append(fvalue)
      return obj
docs: Serializes container as popo
  
      :param obj:
      :param container:
      :param container_type:
      :param params:
      :param field_archiver:
      :return: