I use PostgreSQL ARRAY[] types with Storm, but ran into performance issues with 
the List property that corresponds to ARRAY[]. Cached Lists need to be checked 
for changes on flush(), and if there are many Lists that are cached, it can 
take a long time.

I have added a similar property, Tuple, to Storm to be used instead of List. A 
Tuple is immutable and does not need to be checked on flush(). I hope this is 
useful enough to be incorporated into Storm.

I have uploaded a branch and submitted an enhancement bug for review per the 
(very clear - thanks) DevelopmentProcedure wiki page. See 
https://bugs.launchpad.net/storm/+bug/582256. The branch was taken from the 
trunk as of yesterday.

Thanks,
Dan
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