FA-13238 / Numerical aggregation / Member archive

Positive run block summary: An empty block clears the ongoing suffix. · case 03

The reduction disagrees with its explicit aggregation oracle.

Member previewVariant 3 · 3 implementations · 10 checks per implementation

Case contract

Return [item count, positive prefix length, positive suffix length, longest strictly positive contiguous run] over ordered integer blocks. Empty blocks are identity, zero breaks a run.

Why this case matters

Exact bounded examples isolate a reduction defect without floating-point or external-service effects.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
regression 7	`[4, 4, 2, 2]`	`[4, 4, 4, 4]`	Failed

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