the facilities for fetching (without subscribing to) an object. This is
done extremely rarely and the user might as well just subscribe and
immediately unsubscribe because the dichotomy between fetching and
subscribing just served to overly complicate the internals for no good
reason.
git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@30 542714f4-19e9-0310-aa3c-eee0fc999fb1