There is absolutely no reason to associate the bit size of an integer with
address space.  There are a fair number of systems (more than will ever
run NetBSD, I'm afraid) on which int and long are different sizes, and
pointers are as big as long...  It's called MS-DOS in <foo> mode.  (I can't
recall what <foo> is...)  Now, sure, we *probably* won't ever want to port
mail(1) there, but maybe someone will decide to try it.  :)

-s