The message is definitely outdated, by only mentioning __contains__, but it seems to me that's it's still valid: the order_by value is not passed along, so it can't be used by the new expression? Your test doesn't check that as there is only one value.
The message is definitely outdated, by only mentioning __contains__, but it seems to me that's it's still valid: the order_by value is not passed along, so it can't be used by the new expression? Your test doesn't check that as there is only one value.