code: func (c *BigCache) Stats() Stats {
  	var s Stats
  	for _, shard := range c.shards {
  		tmp := shard.getStats()
  		s.Hits += tmp.Hits
  		s.Misses += tmp.Misses
  		s.DelHits += tmp.DelHits
  		s.DelMisses += tmp.DelMisses
  		s.Collisions += tmp.Collisions
  	}
  	return s
  }
docs: // Stats returns cache's statistics