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Zip longest distinguishes real none · case 04

The operation returns a result or retained state that violates this contract: Zip to exhaustion of both inputs and fill missing positions with a distinct string marker; present None is retained.

Member previewVariant 4 · 3 implementations · 4 checks per implementation

Case scope

A controlled failure with recorded boundary checks.

Why this case matters

A controlled local-runtime regression for collection APIs, language semantics, or ownership wrappers. Fixtures include boundary and interaction cases.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
present None retained	`[[null, "a"]]`	`[[null, "a"], ["missing", "b"]]`	Failed

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