FA-20589 / Assistive announcements / Member archive

Draining replays queued announcements at the next drain · case 04

The announcement trace violates the stated context-lease contract.

Member previewVariant 4 · 3 implementations · 7 checks per implementation

Case contract

Announcement context leases map source to [epoch,text]. Register increments the source epoch and clears its text; publish requires a live source and matching epoch. Queue snapshots text plus source epoch. Drain speaks only still-live matching leases. Remove revokes source. Rename transfers a source lease and invalidates queued old-source messages. Report spoken and queue depth.

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	`[["oldoldoldold", "oldoldoldold"], 1, [["a", [1, "new"]]]]`	`[["oldoldoldold"], 0, [["a", [1, "new"]]]]`	Failed

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