FA-788 / Queues / Member archive

Settle a queue delivery acknowledgement: A delivery tag from another channel is settled · case 03

The queue acknowledge operation is admitted even though a delivery tag from another channel is settled.

Member previewVariant 3 · 3 implementations · 9 checks per implementation

Case contract

Return a Boolean admission decision for settle a queue delivery acknowledgement. The record r must satisfy all of: r['receipt_handle'][0] == r['receipt_handle'][1]; r['lease_live'][0] < r['lease_live'][1]; r['channel_scope'][0] == r['channel_scope'][1]; r['settlement_once'] is False; all(r['batch_prefix']). Extra tracing fields are ignored; validation does not mutate the record.

Why this case matters

A deterministic local contract for queues. Each negative fixture violates exactly one invariant. No transport timing, persistence, cryptographic verification, or full protocol implementation is claimed.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
A delivery tag from another channel is settled	`true`	`false`	Failed

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