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I found "Good software is always written in an idempotent way" sort of hilarious.

Obviously idempotency is a powerful tool, but the confidence with which tfa demands it of all software was silly.

Only Sith deal in absolutes -- I feel that with TDD. Yes, our tests should catch most if not all regressions - no that does not mean we're inherently writing bug-free code as long as it passes all our tests. If someone claims that a methodology is totally necessary, take it with a grain of salt and test your code.

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