public function renderReadableSpec($renderHint = true)
    {
        $c1 = '';
        if ($this->short) {
            $c1 = '-' . $this->short;
        }

        if ($this->long) {
            if ($c1 !== '') {
                $c1 .= ', ';
            }

            $c1 .= '--' . $this->long;
        }

        if ($renderHint) {
            return $c1 . $this->renderValueHint();
        }

        return $c1;
    }