protected function callableOptions($callable)
    {
        // resolve closure
        if (is_callable($callable)) {
            return $callable;
        }

        // resolve callable "Class@method" style
        if (is_string($callable) && list($class, $method) = explode('@', $callable)) {
            return [app()->make($class), $method];
        }

        // resolve callable [$object, "method"]
        if (2 === count($callable) && array_key_exists(0, $callable) && array_key_exists(1, $callable)) {
            if (is_object($class = $callable[0]) && is_string($method = $callable[1]) && method_exists($class, $method)) {
                return [$class, $method];
            }
        }

        return false;
    }