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Validity follows output position instead of base position · case 02

Validity follows output position instead of base position.

Member previewVariant 2 · 3 implementations · 7 checks per implementation

Case contract

Compose a sliced child selection with its parent selection, gather base values, and consult base validity. Preserve child order and repeated indices; invalid entries produce None.

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
permuted duplicates	`[4, 2, 4, null]`	`[4, 2, 4, 3]`	Failed

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

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