public function remove($tag)
    {
        if ($this->count() == 0) {
            return [$this, null];
        }

        $deleted = null;

        foreach ($this->items as $key => $element) {
            if ($element === $tag) {
                $this->forget($key);

                $deleted = $tag;

                break;
            }
        }

        return [$this, $deleted];
    }