{"abstract":"Multipart assembly preserves the normalized request order.","category":"HTTP ranges","checks":6,"contract":"Parts are [request-position,absolute-start,payload]. Return payloads ordered by request-position, not by byte offset or arrival order. Positions unique.","contract_signature":"parts","evaluation_group":"s3-http_ranges-multipart","failed_approach":"The partial repair uses return [p[2] for p in parts], which still violates the stated contract.","family":"s3-http_ranges-multipart-part-order","id":"FA-26476","implementations":{"attempt":{"sha256":"a5132a29d38280ddaf4397543471c5bc21f4736a0e7c49fac7580b2f26c21bf5","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(parts):\n    return [p[2] for p in parts]\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('multipart-part-order fixture 0', solve([[1,0,\"b\"],[0,N,\"a\"]]), [\"a\",\"b\"])\ncheck('multipart-part-order fixture 1', solve([[0,N,\"a\"],[1,0,\"b\"]]), [\"a\",\"b\"])\ncheck('multipart-part-order fixture 2', solve([]), [])\ncheck('multipart-part-order fixture 3', solve([[0,0,\"x\"*N]]), [\"x\"*N])\ncheck('multipart-part-order fixture 4', solve([[2,0,\"c\"],[0,0,\"a\"],[1,0,\"b\"]]), [\"a\",\"b\",\"c\"])\ncheck('multipart-part-order fixture 5', solve([[0,0,\"\"],[1,1,\"b\"]]), [\"\",\"b\"])\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":"c0d8682efe91002eba278fec08673d597977421e04e375b2aa2adb645692b768","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(parts):\n    return [p[2] for p in sorted(parts,key=lambda p:p[1])]\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('multipart-part-order fixture 0', solve([[1,0,\"b\"],[0,N,\"a\"]]), [\"a\",\"b\"])\ncheck('multipart-part-order fixture 1', solve([[0,N,\"a\"],[1,0,\"b\"]]), [\"a\",\"b\"])\ncheck('multipart-part-order fixture 2', solve([]), [])\ncheck('multipart-part-order fixture 3', solve([[0,0,\"x\"*N]]), [\"x\"*N])\ncheck('multipart-part-order fixture 4', solve([[2,0,\"c\"],[0,0,\"a\"],[1,0,\"b\"]]), [\"a\",\"b\",\"c\"])\ncheck('multipart-part-order fixture 5', solve([[0,0,\"\"],[1,1,\"b\"]]), [\"\",\"b\"])\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-multipart-part-order","generated_at":"2026-09-29T14:41:16.316017+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 multipart-part-order decision uses return [p[2] for p in sorted(parts,key=lambda p:p[1])].","sha256":"84351e1f9ad59be4d4a297b9cd13d6bc14b0cf9326975e6ac01c141c0104249b","title":"Multipart assembly preserves the normalized request order · 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":37.122,"exit_code":1,"observations":[{"actual":["b","a"],"check":"multipart-part-order fixture 0","expected":["a","b"],"passed":false},{"actual":["a","b"],"check":"multipart-part-order fixture 1","expected":["a","b"],"passed":true},{"actual":[],"check":"multipart-part-order fixture 2","expected":[],"passed":true},{"actual":["x"],"check":"multipart-part-order fixture 3","expected":["x"],"passed":true},{"actual":["c","a","b"],"check":"multipart-part-order fixture 4","expected":["a","b","c"],"passed":false},{"actual":["","b"],"check":"multipart-part-order fixture 5","expected":["","b"],"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"multipart-part-order fixture 0\", \"actual\": [\"b\", \"a\"], \"expected\": [\"a\", \"b\"], \"passed\": false}, {\"check\": \"multipart-part-order fixture 1\", \"actual\": [\"a\", \"b\"], \"expected\": [\"a\", \"b\"], \"passed\": true}, {\"check\": \"multipart-part-order fixture 2\", \"actual\": [], \"expected\": [], \"passed\": true}, {\"check\": \"multipart-part-order fixture 3\", \"actual\": [\"x\"], \"expected\": [\"x\"], \"passed\": true}, {\"check\": \"multipart-part-order fixture 4\", \"actual\": [\"c\", \"a\", \"b\"], \"expected\": [\"a\", \"b\", \"c\"], \"passed\": false}, {\"check\": \"multipart-part-order fixture 5\", \"actual\": [\"\", \"b\"], \"expected\": [\"\", \"b\"], \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":38.173,"exit_code":1,"observations":[{"actual":["b","a"],"check":"multipart-part-order fixture 0","expected":["a","b"],"passed":false},{"actual":["b","a"],"check":"multipart-part-order fixture 1","expected":["a","b"],"passed":false},{"actual":[],"check":"multipart-part-order fixture 2","expected":[],"passed":true},{"actual":["x"],"check":"multipart-part-order fixture 3","expected":["x"],"passed":true},{"actual":["c","a","b"],"check":"multipart-part-order fixture 4","expected":["a","b","c"],"passed":false},{"actual":["","b"],"check":"multipart-part-order fixture 5","expected":["","b"],"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"multipart-part-order fixture 0\", \"actual\": [\"b\", \"a\"], \"expected\": [\"a\", \"b\"], \"passed\": false}, {\"check\": \"multipart-part-order fixture 1\", \"actual\": [\"b\", \"a\"], \"expected\": [\"a\", \"b\"], \"passed\": false}, {\"check\": \"multipart-part-order fixture 2\", \"actual\": [], \"expected\": [], \"passed\": true}, {\"check\": \"multipart-part-order fixture 3\", \"actual\": [\"x\"], \"expected\": [\"x\"], \"passed\": true}, {\"check\": \"multipart-part-order fixture 4\", \"actual\": [\"c\", \"a\", \"b\"], \"expected\": [\"a\", \"b\", \"c\"], \"passed\": false}, {\"check\": \"multipart-part-order fixture 5\", \"actual\": [\"\", \"b\"], \"expected\": [\"\", \"b\"], \"passed\": true}], \"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."}}