code: func (l *LFUNoTS) Get(key string) (interface{}, error) {
  	res, err := l.cache.Get(key)
  	if err != nil {
  		return nil, err
  	}
  
  	ci := res.(*cacheItem)
  
  	// increase usage of cache item
  	l.incr(ci)
  	return ci.v, nil
  }
docs: // Get gets value of cache item
  // then increments the usage of the item