[Twisted-Python] If the errbacks of a canceled Deferred are called with error other than CancelledError, is this acceptable?

Itamar Turner-Trauring itamar at futurefoundries.com
Tue Jun 18 07:37:59 MDT 2013

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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