protected function _getArgsStack(array &$args = array(), $scope = null, $default = array(), $unset = true)
    {
        $found_args = $default;
        if (isset($args[$scope])) {
            $found_args = $args[$scope];
            if (true===$unset) {
                unset($args[$scope]);
            }
        }
        return $found_args;
    }