protected function _normalizeParams(array &$params)
    {
        ksort($params, \SORT_STRING);
        array_walk($params, function (&$value) {
            if (is_numeric($value)) {
                $value = (string)$value;
            }
        });

        if (isset($params['?'])) {
            $this->_normalizeParams($params['?']);
        }
    }