clean up distribute-aggregate, and make sure gensym normalization works as desired
handle periodic flushing with non-realtime queues properly
rename async-result -> async-promise
fix tests
fix zip on closing
more fixes for group-by closing behavior
allow zip to cause queue backups, and more close behavior fixes in distribute-aggregate
Merge branch 'perf' of github.com:ztellman/lamina into perf