What's the best way to report errors in SLIME that were detected on the Lisp side, such as `no package FOO'? Right now in SLIME48 I just abort the RPC and log a message to the console about the error, but this is suboptimal, because all the user sees is `Evaluation aborted' or `Synchronous Lisp Evaluation aborted.' Perhaps :ABORT responses to RPCs could include optional error messages?