FA-20593 / Assistive announcements / Member archive

Queued announcement loses FIFO order among equals · case 03

The announcement trace violates the stated deadline-scheduler contract.

Member previewVariant 3 · 3 implementations · 10 checks per implementation

Case contract

Enqueue [id,text,ready,expiry,priority]. Cancel removes all matching IDs. Tick sets monotonic clock; dispatch at most one eligible unexpired item, highest priority then earliest enqueue. Expiry is exclusive. Future items remain. Expired items are purged even without ready work. Successful dispatch removes precisely that entry. Clock reset clears queue. Report spoken IDs/text, pending IDs and clock.

Why this case matters

Deterministic controlled model of assistive announcement delivery.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
trace-1	`[[["c", "c"], ["b", "bbb"], ["a", "aaa"]], [], 3]`	`[[["b", "bbb"], ["c", "c"], ["a", "aaa"]], [], 3]`	Failed

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