Cancel an AsyncMaybe? #41
Description
It could be useful to be able to cancel an AsyncMaybe.
It's a very tricky business since CompletableFuture don't really support cancelling and there is still the unresolved question of what happens with parent and child CompletableFutures (e.g. if you cancel a parent, what will happen to the child?)
Anyway, this issue is just to keep a record of this discussion 😄