Let me preface by saying I am a Johnny-come-lately loom fanboy. Amazing work and huge impact. Re structured concurrency: I wonder if there’s any way to combine with generic exceptions such that we can not force a wrapping exception class. So maybe have an executor class that’s generic on the thrown exception type, and then have the join or get apis explicitly throw that type? This thought process is inspired by the goto-considered-harmful trail of logic: I think it would get us even closer to concurrency encapsulated in function blocks.