public function get(string $key)
    {
        $slug = $this->splitKey($key);

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

        $array = $this->toArray();

        foreach ($slug as $search) {
            if (isset($array[$search])) {
                $array = $array[$search];
            } else {
                return;
            }
        }

        return $array;
    }