FA-4658 / Iterator consumption / Member archive

Islice step consumes stop prefix · case 03

The operation returns a result or retained state that violates this contract: Exhausting islice(start,stop,step) consumes through stop regardless of the last yielded position; return [yielded,remaining].

Member previewVariant 3 · 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
skipped final position consumed	`[["a", "c"], ["d", "e"]]`	`[["a", "c"], ["e"]]`	Failed

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