Use native type checking combined with variadic parameters

[holtkamp]

Nice library! Was playing with the same idea.

This concept might be interesting (and better in performance, since it is native?) to implement the TypedCollection:
https://www.sitepoint.com/creating-strictly-typed-arrays-collections-php/

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;
}

And then for the specific implementation of the typed Collection:

class Categories extends TypedCollection
{

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

What do you think?