fixed what looked like an obvious bug in one of our services this week -- a retry was triggering more times than intended. deployed, everything looked fine. two days later a downstream team pinged us saying their backfill reconciliation was failing.
turned out that specific behavior had been relied on, silently, for their eventual-consistency workaround. no documentation of this anywhere. the 'bug' was doing something real.
curious how other people approach making sure you're not accidentally removing behavior that something else depends on, especially in older codebases without full test coverage.
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