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TestCacheTTLExpiry set a 1s TTL and immediately asserted a hit, so it depended on an upper bound of elapsed wall-clock time between Set and Get. Nothing can promise that: on the capacity-1 runner, with the rest of the suite running in parallel, the goroutine can be descheduled for longer than the TTL and the entry is then correctly gone. It failed that way on this PR while passing five times out of five locally, and it touches no code this branch changed. Two entries now: one with an hour to live carries the presence assertions, one with a second carries the expiry. Sleeping past a TTL is always safe, so only the direction that cannot flake is timed.