FiberHandler hangs if route handler throws Exception

[sausax]

Example code: https://github.com/sausax/vertx-sync-fiberhandler-error

FIberHandler hangs if it encounters a RuntimeException in the route handler block. RouteHandler without FiberHandler end the request and gives Internal Server Error.

[doctorpangloss]

Is the expected outcome that the fiber handler also replies to the client "Internal Server Error"?