protected function _styleToString(&$style) {

        if (is_array($style)) {
            $css = $this->newStyle();
            foreach ($style as $prop => $val) {
                $css[$prop] = $val;
            }
            return $css->css();
        } elseif (is_a($style, '\\s4y\\Style')) {
            return $style->css();
        }
        return $style.PHP_EOL;
    }