code: async def tuple(self, elem=None, elem_type=None, params=None):
          
          if hasattr(elem_type, 'blob_serialize'):
              container = elem_type() if elem is None else elem
              return await container.blob_serialize(self, elem=elem, elem_type=elem_type, params=params)
  
          if self.writing:
              return await self.dump_tuple(elem, elem_type, params)
          else:
              return await self.load_tuple(elem_type, params=params, elem=elem)
docs: Loads/dumps tuple
          :return: