Yeah I'm confused here too, I understand there might be a need for some of these, but you should be able to just rely on autoboxing of primitives to Objects lik

Yeah I'm confused here too, I understand there might be a need for some of these, but you should be able to just rely on autoboxing of primitives to Objects like what RxJava does: https://github.com/ReactiveX/RxJava/tree/1.x/src/main/java/rx/functions https://github.com/ReactiveX/RxJava/tree/1.x/src/main/java/r... I can maybe see an extra variation for exceptions, but that would be one more generic or a Set<? extends Exception> no?