just changes their ugly `return Unit.INSTANCE;` to...

# announcements

[kevinmost]

just changes their ugly return Unit.INSTANCE; to the slightly less ugly return null;

[Czar]

converting it to Consumer<A> would probably be even better.

[kevinmost]

agreed but that brings up concerns for interop. There'd also have to be 23 ConsumerN<T1,..,T(N-1)> variants