docs: def mine_items(self, identifiers, params=None, callback=None):
          """Mine metadata from Archive.org items.
  
          :param identifiers: Archive.org identifiers to be mined.
          :type identifiers: iterable
  
          :param params: URL parameters to send with each metadata
                         request.
          :type params: dict
  
          :param callback: A callback function to be called on each
                           :py:class:`aiohttp.client.ClientResponse`.
          :type callback: func
          """
          # By default, don't cache item metadata in redis.
          params = {'dontcache': 1} if not params else {}
          requests = metadata_requests(identifiers, params, callback, self)
          yield from self.mine(requests)