PHP type safe "generic" collection

Items.php

<?php

declare(strict_types=1);

namespace Some\Namespace;

use IteratorAggregate;
use Traversable;

/**
 * @implements IteratorAggregate<Item>
 */
final readonly class Items implements IteratorAggregate
{

    /**
     * array<Item>
     */
    private array $items;

    private function __construct(
        Item ...$items
    ) {
        $this->items = $items;
    }

    /**
     * @param array<Item> $items
     */
    public static function fromArray(array $items): self
    {
        return new self(...$items);
    }

    public function getIterator(): Traversable
    {
        yield from $this->items;
    }
}