public function insertRange($index, array $items)
{
$this->validateIndex($index);
$this->validateItems($items, $this->type);
//To work with negative index, get the positive relation to 0 index
$index < 0 && ($index = $this->count() + $index + 1);
$partA = array_slice($this->items, 0, $index);
$partB = array_slice($this->items, $index, count($this->items));
$items1 = array_merge($partA, $items);
$items1 = array_merge($items1, $partB);
$col = new static($this->type);
$col->setItemsFromTrustedSource($items1);
return $col;
}