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Short left lists repeat their final element instead of null padding · case 04

Short left lists repeat their final element instead of null padding.

Member previewVariant 4 · 3 implementations · 7 checks per implementation

Case contract

Zip two optional lists within each parent row using longest-list semantics and zero-based ordinals. Missing positions become None; two empty or null lists yield one outer placeholder with ordinal 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
longer right	`[[4, 0, 5, 6], [4, 1, 5, 7]]`	`[[4, 0, 5, 6], [4, 1, null, 7]]`	Failed

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

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