code: func (c *cache) Get(k string) (interface{}, bool) {
  	c.mu.RLock()
  	// "Inlining" of get and Expired
  	item, found := c.items[k]
  	if !found {
  		c.mu.RUnlock()
  		return nil, false
  	}
  	if item.Expiration > 0 {
  		if time.Now().UnixNano() > item.Expiration {
  			c.mu.RUnlock()
  			return nil, false
  		}
  	}
  	c.mu.RUnlock()
  	return item.Object, true
  }
docs: // Get an item from the cache. Returns the item or nil, and a bool indicating
  // whether the key was found.