Developer ports cron-parser from TypeScript to Go, uncovers silent date-handling bugs

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A developer spent a weekend porting the popular cron-parser library from TypeScript to Go, running the original unmodified test suite against the new implementation. Using a differential testing harness, they discovered 41,088 divergences caused by subtle differences in how JavaScript's Luxon library and Go's time package handle date arithmetic and DST transitions. Key discrepancies included asymmetric month/year clamping versus overflow behavior and opposite DST gap resolution directions, the latter of which could silently shift results to the wrong calendar day. Four tests in the original suite were found to be passing vacuously — a spy asserting a method was never called trivially passes when the method does not exist in the ported code. The developer resolved all divergences and added instrumented logging to ensure the passing tests were genuinely meaningful rather than silent false positives.

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