FA-21577 / Assistive announcements / Member archive

Base-language match beats an exact speech locale · case 02

The announcement trace violates the stated voice-negotiation contract.

Member previewVariant 2 · 3 implementations · 7 checks per implementation

Case contract

Voice inventory rows are [id,language,local,quality,features]. Request [language,offline,required-features,preferred-id]. Selection excludes unavailable or missing-feature voices, honors exact preferred only among eligible, then ranks exact language before base-language before en fallback, local before remote, higher quality, then lexical ID. Add replaces same ID; remove marks unavailable; enable restores it. Return selected IDs or None, inventory IDs and disabled IDs.

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-3	`[["a", "a", "e"], ["z", "a", "e"], []]`	`[["z", "a", "e"], ["z", "a", "e"], []]`	Failed

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