code: func newLRUCache(maxEntries uint32) *lruCache {
  	c := &lruCache{
  		cache:  lru.New(int(maxEntries)),
  		counts: make(map[uint64]uint64),
  		stats:  stats.NopStatsClient,
  	}
  	c.cache.OnEvicted = c.onEvicted
  	return c
  }
docs: // newLRUCache returns a new instance of LRUCache.