{"abstract":"Repeated close events release a range handle only once.","category":"HTTP ranges","checks":6,"contract":"Events are close or tick. Initially one handle is open. Return [release-count,open]; subsequent close is a no-op.","contract_signature":"events","evaluation_group":"s3-http_ranges-stream-transfer","failed_approach":"The partial repair uses return [1,False], which still violates the stated contract.","family":"s3-http_ranges-stream-close-idempotency","id":"FA-26576","implementations":{"attempt":{"sha256":"5bb8068ea686e003290861a3a7dbbf04b91a52b47403ac8c0575cc05b073cb51","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(events):\n    return [1,False]\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('stream-close-idempotency fixture 0', solve( [\"close\"]*(N+1)), [1,False])\ncheck('stream-close-idempotency fixture 1', solve([]), [0,True])\ncheck('stream-close-idempotency fixture 2', solve([\"tick\"]*N), [0,True])\ncheck('stream-close-idempotency fixture 3', solve([\"close\"]), [1,False])\ncheck('stream-close-idempotency fixture 4', solve([\"tick\",\"close\",\"tick\"]), [1,False])\ncheck('stream-close-idempotency fixture 5', solve([\"close\",\"tick\",\"close\"]), [1,False])\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"},"broken":{"sha256":"2173467e7f0d5847109c2b59a35ec20f9256830639ea60c26318f26b0cbcd0f2","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(events):\n    return [events.count(\"close\"),\"close\" not in events]\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('stream-close-idempotency fixture 0', solve( [\"close\"]*(N+1)), [1,False])\ncheck('stream-close-idempotency fixture 1', solve([]), [0,True])\ncheck('stream-close-idempotency fixture 2', solve([\"tick\"]*N), [0,True])\ncheck('stream-close-idempotency fixture 3', solve([\"close\"]), [1,False])\ncheck('stream-close-idempotency fixture 4', solve([\"tick\",\"close\",\"tick\"]), [1,False])\ncheck('stream-close-idempotency fixture 5', solve([\"close\",\"tick\",\"close\"]), [1,False])\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"}},"limitations":"Deterministic simplified range service, with stipulated local policies and already parsed trusted inputs; not a complete HTTP implementation. This reproducer isolates one failure mechanism. Results cover the supplied fixtures. Variants within a family share a test contract and should remain grouped when constructing evaluation splits. Related mechanisms with a shared evaluation_group must also remain together; these controlled models are not independent production incidents.","method":"Deterministic executable model with adversarial boundary fixtures.","provenance":{"created_by":"Failure Map","dependencies":"Python standard library","family":"s3-http_ranges-stream-close-idempotency","generated_at":"2026-09-29T14:41:17.193359+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"Range responses combine representation identity, conditional requests, framing, and partial-object state.","root_cause":"The stream-close-idempotency decision uses return [events.count(\"close\"),\"close\" not in events].","sha256":"86d474304c2bcc768139d2906bbcaa181a1fe3476279232acd9b6980ff6bdaf6","title":"Repeated close events release a range handle only once · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verified":true,"visibility":"public","verification":{"attempt":{"elapsed_ms":38.389,"exit_code":1,"observations":[{"actual":[1,false],"check":"stream-close-idempotency fixture 0","expected":[1,false],"passed":true},{"actual":[1,false],"check":"stream-close-idempotency fixture 1","expected":[0,true],"passed":false},{"actual":[1,false],"check":"stream-close-idempotency fixture 2","expected":[0,true],"passed":false},{"actual":[1,false],"check":"stream-close-idempotency fixture 3","expected":[1,false],"passed":true},{"actual":[1,false],"check":"stream-close-idempotency fixture 4","expected":[1,false],"passed":true},{"actual":[1,false],"check":"stream-close-idempotency fixture 5","expected":[1,false],"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"stream-close-idempotency fixture 0\", \"actual\": [1, false], \"expected\": [1, false], \"passed\": true}, {\"check\": \"stream-close-idempotency fixture 1\", \"actual\": [1, false], \"expected\": [0, true], \"passed\": false}, {\"check\": \"stream-close-idempotency fixture 2\", \"actual\": [1, false], \"expected\": [0, true], \"passed\": false}, {\"check\": \"stream-close-idempotency fixture 3\", \"actual\": [1, false], \"expected\": [1, false], \"passed\": true}, {\"check\": \"stream-close-idempotency fixture 4\", \"actual\": [1, false], \"expected\": [1, false], \"passed\": true}, {\"check\": \"stream-close-idempotency fixture 5\", \"actual\": [1, false], \"expected\": [1, false], \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":40.667,"exit_code":1,"observations":[{"actual":[2,false],"check":"stream-close-idempotency fixture 0","expected":[1,false],"passed":false},{"actual":[0,true],"check":"stream-close-idempotency fixture 1","expected":[0,true],"passed":true},{"actual":[0,true],"check":"stream-close-idempotency fixture 2","expected":[0,true],"passed":true},{"actual":[1,false],"check":"stream-close-idempotency fixture 3","expected":[1,false],"passed":true},{"actual":[1,false],"check":"stream-close-idempotency fixture 4","expected":[1,false],"passed":true},{"actual":[2,false],"check":"stream-close-idempotency fixture 5","expected":[1,false],"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"stream-close-idempotency fixture 0\", \"actual\": [2, false], \"expected\": [1, false], \"passed\": false}, {\"check\": \"stream-close-idempotency fixture 1\", \"actual\": [0, true], \"expected\": [0, true], \"passed\": true}, {\"check\": \"stream-close-idempotency fixture 2\", \"actual\": [0, true], \"expected\": [0, true], \"passed\": true}, {\"check\": \"stream-close-idempotency fixture 3\", \"actual\": [1, false], \"expected\": [1, false], \"passed\": true}, {\"check\": \"stream-close-idempotency fixture 4\", \"actual\": [1, false], \"expected\": [1, false], \"passed\": true}, {\"check\": \"stream-close-idempotency fixture 5\", \"actual\": [2, false], \"expected\": [1, false], \"passed\": false}], \"passed\": false}\n"}},"member_only":{"stages":["fixed"],"fields":["implementations.fixed","verification.fixed","harness","repair"],"note":"The verified repair, its recorded checks, the repair description, and the scoring harness are available to members."}}