public function setThreshold($threshold)
    {

        // need to return << true
        if (is_array($threshold) === true) {
            $threshold = array_map('intval', array_splice($threshold, 0, 2));
        }

        else {
            $threshold = intval($threshold);
        }
        $this->validator->verify($threshold, [], 'threshold');

        return $this;
    }