Exception handling in streams #59
Description
All of the streams callbacks are using java.util.function.*, which don't allow throwing checked exceptions. Should we allow streams to be completed with checked exceptions, by providing a wrapper unchecked exception that gets unwrapped when caught? java.util.concurrent.CompletionException could be a candidate to use.
One argument for not doing this is that CompletionStage doesn't do it, so it may worth being consistent in behavior with CompletionStage. On the other hand, it's much nicer for users to not have to unwrap exceptions.