code: async def blob(self, elem=None, elem_type=None, params=None):
          
          elem_type = elem_type if elem_type else elem.__class__
          if hasattr(elem_type, 'blob_serialize'):
              elem = elem_type() if elem is None else elem
              return await elem.blob_serialize(self, elem=elem, elem_type=elem_type, params=params)
  
          if self.writing:
              return await x.dump_blob(self.iobj, elem=elem, elem_type=elem_type, params=params)
          else:
              return await x.load_blob(self.iobj, elem_type=elem_type, params=params, elem=elem)
docs: Loads/dumps blob
          :return: