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Exploded list positions use one-based ordinals · case 03

Exploded list positions use one-based ordinals.

Member previewVariant 3 · 3 implementations · 7 checks per implementation

Case contract

Explode [id,list-or-None] rows preserving input and element order. Outer semantics yield [id,None,None] for null or empty lists; populated lists yield [id,zero-based-position,value], including null elements.

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
ordered parents	`[[5, 1, 3], [5, 2, 4], [3, 1, 6]]`	`[[5, 0, 3], [5, 1, 4], [3, 0, 6]]`	Failed

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