code: public function pop($count = null)
      {
          $popped = $this->redis->spop($this->key, $count);
          if (\is_array($popped)) {
              return $this->unSerializeArray($popped);
          }
  
          return $this->unSerialize($popped);
      }
docs: @param null $count The amount of members to pop.
  
  @return mixed Random member of set. Will be removed!
  If $count > 1 and a valid set, the result will always be an array.