FA-20853 / Assistive announcements / Member archive

Pump takes the most recently queued speech · case 03

The announcement trace violates the stated speech-backpressure contract.

Member previewVariant 3 · 3 implementations · 7 checks per implementation

Case contract

Transport starts with two credits. Queue appends speech. Pump sends up to available credits, records inflight IDs and consumes credit. Acknowledge known inflight ID releases exactly one credit; unknown ACK does nothing. Window sets nonnegative capacity and credit to max(0,capacity-inflight). Disconnect moves inflight messages before queued ones in original send order and restores credits; cancel removes only queued matching IDs. Return sent text trace, inflight IDs, queue IDs and credit.

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	`[["gamma", "beta"], ["c", "b"], ["a"], 0]`	`[["alphaalphaalpha", "beta"], ["b"], ["c"], 1]`	Failed

MEMBER ARCHIVE

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