I just soak everything in asserts. That way there is no need to scroll up for preconditions, be it a nested tree or some returns at the start. And when you mo

I just soak everything in asserts. That way there is no need to scroll up for preconditions, be it a nested tree or some returns at the start. And when you move a small piece of code, you're told exactly what you should be thinking about, you need to decide what to do with that assert that represents an assumption.