Found annoying to figure out each time which method to use. I'm not very good at rememebering all Java functional interfaces.
Proposal:
Give all Sneaky class methods same name (unchecked for example) thus overloading them.
Instead of writing
myStream.forEach(Sneaky.consumer(lambda));
it would look like
myStream.forEach(unchecked(lambda));
Notice static import now is more sensible.
Also it helps with refactoring when lambda signature changes.