FA-20469 / Assistive announcements / Member archive

Corrected chunk text is ignored · case 04

The announcement trace violates the stated chunk-assembly contract.

Member previewVariant 4 · 3 implementations · 8 checks per implementation

Case contract

Utterance chunks carry a sequence index. Begin sets expected count and clears previous chunks. Put accepts only in-range indices; last write wins. Seal emits only a contiguous complete set, in index order, joined by spaces. A successful seal clears pieces and closes the assembly. Cancel closes without speech; reopen starts a new assembly. Report emitted strings and pending indices.

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-2	`[["old end"], [], false]`	`[["newnewnewnew end"], [], false]`	Failed

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