> ISTM, you're being somewhat aggressive and condescending. 

Interestingly, I felt the same with your reply, which explains my rapid reversion of your closing of the ticket. The way I see it: I pointed out a bug in tuple hashing and you just closed that, basically claiming that it's not a bug.

I still don't understand why you are closing this so quickly. To put it differently: if I can improve the hash function, removing that obvious collision, extending the tests to catch this case, while not making it slower, why shouldn't this be done?