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use Illuminate\Contracts\Support\Arrayable;
use Illuminate\Contracts\Support\Collection;

abstract class TypedCollection extends Collection
{

    public function __construct($items = [])
    {
        if (is_array($items)) {
            $this->setItems(...$items);
        }
        if ($items instanceof static) {
            $this->setItems(...$this->items);
        }
        if ($items instanceof Arrayable) {
            $this->setItems(...$items->toArray());
        }

        parent::__construct($items);
    }

    protected abstract function setItems(): void;
}

class Categories extends TypedCollection
{

    protected function setItems(Category ...$items): void
    {
        $this->items = $items;
    }
}