FA-13055 / Numerical aggregation / Member archive

Histogram interval mass: Reversed query bounds are silently sorted into a nonempty query. · case 05

The reduction disagrees with its explicit aggregation oracle.

Member previewVariant 5 · 3 implementations · 9 checks per implementation

Case contract

Bins [left,right,mass] have positive widths and nonnegative integer masses. Treat each bin as uniform density. Return exact mass in query [a,b] as a Fraction string; reversed/empty queries have zero mass.

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"`	`"0"`	Failed

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

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