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3305bad0c2
The `is` operator compares references, not values. Thanks to a wonderfully unintuitive quirk of python, `is` works on integers from `-5` to `256`, inclusive. Whenever integers in this range are used for a value, internally python returns a reference to a stable object in memory. When integers outside this range are used as a value, python creates a new object in memory for that integer. See `PyLong_FromLong` documentation here: https://docs.python.org/3/c-api/long.html Tying this back to our session processor, we were using `is` to compare the queue item ids for equality. Our queue item ids start at 0, and each queue item created increments this by one. So this comparison works only for the first 256 queue items on the machine. Starting with the 257th queue item, the comparison starts returning `False`, and cancelation gets weird. Easy fix - use `!=` instead of `is not`.