FA-50084 / PCM sample encoding / Member archive

Pcm sample validity sideband: validity index · case 04

All PCM samples use the first validity flag.

Member previewVariant 4 · 3 implementations · 8 checks per implementation

Case contract

Decode PCM with a parallel validity vector, missing flags invalid, holding the most recent valid sample for invalid positions while retaining explicit validity metadata.

Why this case matters

Offline PCM interchange uses these exact bounded packet and sample representation decisions.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
oracle 1	`[[[1, true], [9, true], [3, true], [8, true]], 8]`	`[[[1, true], [1, false], [3, true], [3, false]], 3]`	Failed

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This record includes three runnable implementations, regression fixtures, execution results, and source hashes.

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