// Init initializes or clears list l.
func (l *LruList[K, V]) Init() *LruList[K, V] {
	l.root.next = &l.root
	l.root.prev = &l.root
	l.len = 0
	return l
}

// NewList returns an initialized list.
func NewList[K comparable, V any]() *LruList[K, V] { return new(LruList[K, V]).Init() }

// Length returns the number of elements of list l.
// The complexity is O(1).
func (l *LruList[K, V]) Length() int { return l.len }