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Client offline mutation outbox: Unsent tail retention · case 03

Unsent tail retention.

Member previewVariant 3 · 3 implementations · 60 checks per implementation

Case contract

The client outbox is an ordered UI mutation log; commands use identity, not payload truthiness. Cancellation/acknowledgment remove only matching commands, offline mode retains unsent work, and a zero send budget sends nothing. Operation unsent-tail-retention has the six explicit input/output oracles below.

Why this case matters

An offline client lifecycle model that isolates a state-management defect without DOM rendering or network services.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
unsent-tail-retention scenario 3	`[]`	`[["a", "edit", 0]]`	Failed

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