FA-14044 / Numerical aggregation / Member archive

Bucket extrema downsampling: Selected points report bucket-local rather than global indices. · case 04

The reduction disagrees with its explicit aggregation oracle.

Member previewVariant 4 · 3 implementations · 8 checks per implementation

Case contract

For positive integer width, partition numeric observations into consecutive buckets including a final short bucket. Emit each bucket first-occurring minimum and first-occurring maximum once, in original observation order, as [global index,value]. Flat buckets emit one point.

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 1	`[[0, 8], [1, 1], [0, 2], [1, 9], [0, 4]]`	`[[0, 8], [1, 1], [3, 2], [4, 9], [6, 4]]`	Failed

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