FA-798 / Queues / Member archive
Settle a queue delivery acknowledgement: Cumulative acknowledgement jumps over an unprocessed delivery · case 03
The queue acknowledge operation is admitted even though cumulative acknowledgement jumps over an unprocessed delivery.
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 fixtureThis sample comes from the broken implementation of a controlled reproducer.
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| Cumulative acknowledgement jumps over an unprocessed delivery | true | false | Failed |
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