clean-up: rewrote explore_null and explore_numeric without using sentinel. we do not need it since we make (at most) a single addrinfo entry in these cases.
clean-up: rewrote explore_null and explore_numeric without using sentinel.
we do not need it since we make (at most) a single addrinfo entry in these
cases.

MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame