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Filtered updates emit unchanged rows as spurious changes · case 02

Filtered updates emit unchanged rows as spurious changes.

Member previewVariant 2 · 3 implementations · 8 checks per implementation

Case contract

Convert a sequence of [id,before,after] updates into signed filtered rows, with None denoting absent row. The predicate is value>=cutoff. Emit qualifying before-images negatively before qualifying after-images positively; suppress unchanged qualifying values.

Why this case matters

A bounded deterministic data engine model makes representation and changelog faults reproducible.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
unchanged	`[[7, 2, -1], [7, 2, 1]]`	`[]`	Failed

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