have helper functions named set<field>At() for such a purpose.
git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@1134 542714f4-19e9-0310-aa3c-eee0fc999fb1
*always* set immediately because after some deliberation, we decided that
doing that led to less unexpectedly annoying behavior than having to wait
for the event to propagate to see the new value.
git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@1062 542714f4-19e9-0310-aa3c-eee0fc999fb1