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Upstream attempt history preserves equal statuses · case 03

Upstream attempt history preserves equal statuses.

Member previewVariant 3 · 3 implementations · 4 checks per implementation

Case contract

Given attempts, upstream attempt history preserves equal statuses. Return the protocol decision or transformed value; fields are validated and fixtures state boundary outcomes.

Why this case matters

This deterministic proxy forwarding model isolates the upstream-attempt-history-preserves-equal-statuses policy at a network component boundary.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
fixture 1	`[{"attempt": 1, "elapsed": 2, "status": 502}, {"attempt": 2, "elapsed": 1, "status": 200}]`	`[{"attempt": 1, "elapsed": 2, "status": 502}, {"attempt": 2, "elapsed": 2, "status": 502}, {"attempt": 3, "elapsed": 1, "status": 200}]`	Failed

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