func (b *Batch[K, T]) GetAll() (orderedKeys []K, orderedItems []T, err error) {
	b.Lock()
	defer b.Unlock()

	orderedKeys = append([]K(nil), b.keys...)
	for _, key := range orderedKeys {
		item, ok := b.items[key]
		if !ok {
			err = fmt.Errorf("item not found for the key: %v; should not happen;", key)
			return
		}
		orderedItems = append(orderedItems, item)
		delete(b.items, key)
	}

	b.keys = b.keys[:0]