public static function fromString($native, $separator = ',')
    {
        $values = explode($separator, $native, 4);

        if (count($values) !== 4) {
            throw new \InvalidArgumentException(
                sprintf('LatLngBounds can not be created from string "%s"', $native)
            );
        }

        return new LatLngBounds(
            new LatLng($values[0], $values[1]),
            new LatLng($values[2], $values[3])
        );
    }