Allow log-exception to alter :message

[icexelloss]

Hello there!

I find it useful to return some kind of information to the client when uncaught exception happens on the server side. One use case for this would be return a request it to the client when uncaught exception happens so the server developer can identify the problematic request quickly.

Currently, handle-exception doesn't merge the context map, I am wondering can we add support for that? I am happy to submit a PR just wondering if this is something we want to do.

[ordnungswidrig]

I'm not quite sure I understand this completely, can you please post a small example? What you propose doesn't sound bad but I want to make sure this is something that isn't possible already.