FA-13889 / Numerical aggregation / Member archive

Retractable zero aware product: Any negative factor forces a negative result instead of parity. · case 04

The reduction disagrees with its explicit aggregation oracle.

Member previewVariant 4 · 3 implementations · 11 checks per implementation

Case contract

Process add/remove integer factors; each removal removes one currently present equal factor. Return the exact product of active factors with empty product one. Preserve zero multiplicity and signed parity while zero factors temporarily hide the nonzero product.

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 10	`-30`	`30`	Failed

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