Which is why I start from integration testing of the whole system, with frenemy tests for any foreign services that I must rely on. You're right that tests don

Which is why I start from integration testing of the whole system, with frenemy tests for any foreign services that I must rely on. You're right that tests don't make Byzantine failures go away. But neither do static types. My point that distribution turns all systems into analogies for dynamic language programming remains, and so the emphasis on tool support changes along with it.