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A filtered update publishes insertion before retraction · case 03

A filtered update publishes insertion before retraction.

Member previewVariant 3 · 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
changes within filter	`[[7, 5, 1], [7, 4, -1]]`	`[[7, 4, -1], [7, 5, 1]]`	Failed

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