By way of background, Kai Zhang is one of our GSoC interns, working on adding Deferred cancellation support to Twisted. I believe the specific module he is working on is the POP3 client, but it's a general question - should we try to keep CancelledError percolating all the way to the top of callback chain when possible? My first thought is "yes" since that's a more informative reason, but maybe someone else has a counter-argument.
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