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Deque uniqueness treats zero as never seen · case 02

Deque uniqueness treats zero as never seen.

Member previewVariant 2 · 3 implementations · 6 checks per implementation

Case contract

Keep the first occurrence of each deque payload and return survivor values plus original positions removed. Payload equality is integer equality; zero is a valid value.

Why this case matters

Controlled bounded deque implementation model with explicit storage and lifecycle observations.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
1	`[[0, 2, 0], [3]]`	`[[0, 2], [2, 3]]`	Failed

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