c.mu.RLock()
	defer c.mu.RUnlock()
	if ent := c.evictList.Back(); ent != nil {
		return ent.Key, ent.Value, true
	}
	return
}

func (c *LRU[K, V]) KeyValues() map[K]V {
	c.mu.RLock()
	defer c.mu.RUnlock()
	maps := make(map[K]V)
	now := time.Now()
	for ent := c.evictList.Back(); ent != nil; ent = ent.PrevEntry() {
		if now.After(ent.ExpiresAt) {
			continue
		}
		maps[ent.Key] = ent.Value