This patch will prevent some random memory leaking. #616
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The internal closedA object was leaking memory while being totally useless.
It had issues with its size, at random times socket.io stopped removing keys from it,
I found that (Object.keys(closedA).length) was more than 350,000 after running for 10 hours.
Edit: i made some more tests, this really fixes a large memory leak, atleast on node 0.4.8