public function has(string $key): bool
    {
        $slug = $this->splitKey($key);

        if (is_string($slug)) {
            return isset($this[$slug]);
        }

        $collection = $this->all();

        foreach ($this->splitKey($key) as $search) {
            if (!isset($collection[$search])) {
                return false;
            }

            $collection = $collection[$search];
        }

        return true;
    }