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It would be a good idea to quickly delete this and email pg directly about it, so few people are aware of the experiment.

Ah, I thought security by obscurity was out of fashion by now. I'm admittedly out of touch with the "real" world.

I thought good experimental design involved not telling people what you're testing if they have any means of altering the test.

aah .. too late for it now i guess. should have read your comment earlier.