Question from the Laravel test

use App\Enums\ProductStatus;

protected $casts = [
    'status' => ProductStatus::class,
];

use App\Enums\ProductStatus;

protected $casts = [
    'status' => ProductStatus,
];

It's not possible

use App\Enums\ProductStatus;

protected $casts = [
    'status' => 'ProductStatus',
];