protected static function processUnlimitedOption(array &$options, $key)
    {
        $ukey = "u{$key}";
        unset($options[$ukey]);
        if (array_key_exists($key, $options) && ($options[$key] === 'unlimited' || !isset($options[$key]))) {
            $options[$ukey] = 'ON';
        }
    }