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Closes #62
So most errors fixed themselves at some point. However,
test_ignore_error_if_raisedbecame flaky. I think there was a race where either 42 or "c" could win. And if "c" won, then 42 was coerced into a string, which meant the test did not fail as expected. Adding an explicit mapping fixed this. I also added notifications to be alerted of failure.