code: func (c *ExpirationCache) getTimestampedEntry(key string) (*timestampedEntry, bool) {
  	item, _ := c.cacheStorage.Get(key)
  	// TODO: Check the cast instead
  	if tsEntry, ok := item.(*timestampedEntry); ok {
  		return tsEntry, true
  	}
  	return nil, false
  }
docs: // getTimestampedEntry returnes the timestampedEntry stored under the given key.