Node *s as arguments. If you use casts to convert (MyNode *)s to (Node
   *)s, it is easy to make mistakes the compiler does not catch. I learned
					^^^^^^^^^^^^^^^^^^^^^^^

this is a really good reason.  we already use gcc's warning
capabilities extensively (for almost the entire tree, now) as an
(enforced) delinting tool.. this is just another way of using it.


but i think if you look closely at NetBSD, you'll find both styles
used throughout the kernel... :-)