Hey, nonsense, yourself. Andrew's constructors are variadic.
That means we just plain _cannot_ write generic macros that pass some
of their arguments into sysctl constructors, in the way that FreeBSD
does: the number of arguments in the macro-expansion has to vary,
and C macros just can't do that.

I've said as much to Andrew, and AFAIK he hasn't disagreed with it yet.