Very glad you are enjoying the library. In this situation I would recommend catching all exceptions on the server side and then returning some object you manage yourself to the client.
We have not implemented a specific core feature for this as everyone may want to do it differently, as such we have left it to the developer to choose their own solution.
Having said that exception handling has been added as a feature to our Remote Procedure Call extension. We don’t have an online tutorial for this but it is extensively documented in the examples included in the download bundle.