docs: def sdiffstore(self, dest, *keys):
          """
          Store the difference of sets specified by ``keys`` into a new
          set named ``dest``.  Returns the number of keys in the new set.
          """
          keys = [self.redis_key(k) for k in self._parse_values(keys)]
  
          with self.pipe as pipe:
              return pipe.sdiffstore(self.redis_key(dest), *keys)