{"abstract":"Conflicting duplicate Content-Range fields cannot choose an arbitrary winner.","category":"HTTP ranges","checks":6,"contract":"Parsed field values are normalized strings. Return sole agreed value if nonempty and all identical, else None.","contract_signature":"values","evaluation_group":"s3-http_ranges-response-metadata","failed_approach":"The partial repair uses return values[-1] if values else None, which still violates the stated contract.","family":"s3-http_ranges-content-range-duplicate-disagreement","id":"FA-26721","implementations":{"attempt":{"sha256":"3e1bc4ea5417a8da2b9903f3ba879eb04508b48ea7ef2945f3f3b7aac3fe7e1b","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(values):\n    return values[-1] if values else None\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('content-range-duplicate-disagreement fixture 0', solve( [\"r\"+str(N),\"other\"]), None)\ncheck('content-range-duplicate-disagreement fixture 1', solve([\"r\",\"r\"]), \"r\")\ncheck('content-range-duplicate-disagreement fixture 2', solve([]), None)\ncheck('content-range-duplicate-disagreement fixture 3', solve([\"r\"]), \"r\")\ncheck('content-range-duplicate-disagreement fixture 4', solve([\"a\",\"b\",\"a\"]), None)\ncheck('content-range-duplicate-disagreement fixture 5', solve([\"\",\"\"]), \"\")\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":"173891241e114507d23367f6ef45b9755107d016eebee017ff546337a159e3f6","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(values):\n    return values[0] if values else None\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('content-range-duplicate-disagreement fixture 0', solve( [\"r\"+str(N),\"other\"]), None)\ncheck('content-range-duplicate-disagreement fixture 1', solve([\"r\",\"r\"]), \"r\")\ncheck('content-range-duplicate-disagreement fixture 2', solve([]), None)\ncheck('content-range-duplicate-disagreement fixture 3', solve([\"r\"]), \"r\")\ncheck('content-range-duplicate-disagreement fixture 4', solve([\"a\",\"b\",\"a\"]), None)\ncheck('content-range-duplicate-disagreement fixture 5', solve([\"\",\"\"]), \"\")\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-content-range-duplicate-disagreement","generated_at":"2026-09-29T14:41:18.566114+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 content-range-duplicate-disagreement decision uses return values[0] if values else None.","sha256":"1c53e870f926bb7424c63f4ca9ca8e3cc73046a2421c1543c4898de2c388421f","title":"Conflicting duplicate Content-Range fields cannot choose an arbitrary winner · 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":40.081,"exit_code":1,"observations":[{"actual":"other","check":"content-range-duplicate-disagreement fixture 0","expected":null,"passed":false},{"actual":"r","check":"content-range-duplicate-disagreement fixture 1","expected":"r","passed":true},{"actual":null,"check":"content-range-duplicate-disagreement fixture 2","expected":null,"passed":true},{"actual":"r","check":"content-range-duplicate-disagreement fixture 3","expected":"r","passed":true},{"actual":"a","check":"content-range-duplicate-disagreement fixture 4","expected":null,"passed":false},{"actual":"","check":"content-range-duplicate-disagreement fixture 5","expected":"","passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"content-range-duplicate-disagreement fixture 0\", \"actual\": \"other\", \"expected\": null, \"passed\": false}, {\"check\": \"content-range-duplicate-disagreement fixture 1\", \"actual\": \"r\", \"expected\": \"r\", \"passed\": true}, {\"check\": \"content-range-duplicate-disagreement fixture 2\", \"actual\": null, \"expected\": null, \"passed\": true}, {\"check\": \"content-range-duplicate-disagreement fixture 3\", \"actual\": \"r\", \"expected\": \"r\", \"passed\": true}, {\"check\": \"content-range-duplicate-disagreement fixture 4\", \"actual\": \"a\", \"expected\": null, \"passed\": false}, {\"check\": \"content-range-duplicate-disagreement fixture 5\", \"actual\": \"\", \"expected\": \"\", \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":38.258,"exit_code":1,"observations":[{"actual":"r1","check":"content-range-duplicate-disagreement fixture 0","expected":null,"passed":false},{"actual":"r","check":"content-range-duplicate-disagreement fixture 1","expected":"r","passed":true},{"actual":null,"check":"content-range-duplicate-disagreement fixture 2","expected":null,"passed":true},{"actual":"r","check":"content-range-duplicate-disagreement fixture 3","expected":"r","passed":true},{"actual":"a","check":"content-range-duplicate-disagreement fixture 4","expected":null,"passed":false},{"actual":"","check":"content-range-duplicate-disagreement fixture 5","expected":"","passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"content-range-duplicate-disagreement fixture 0\", \"actual\": \"r1\", \"expected\": null, \"passed\": false}, {\"check\": \"content-range-duplicate-disagreement fixture 1\", \"actual\": \"r\", \"expected\": \"r\", \"passed\": true}, {\"check\": \"content-range-duplicate-disagreement fixture 2\", \"actual\": null, \"expected\": null, \"passed\": true}, {\"check\": \"content-range-duplicate-disagreement fixture 3\", \"actual\": \"r\", \"expected\": \"r\", \"passed\": true}, {\"check\": \"content-range-duplicate-disagreement fixture 4\", \"actual\": \"a\", \"expected\": null, \"passed\": false}, {\"check\": \"content-range-duplicate-disagreement fixture 5\", \"actual\": \"\", \"expected\": \"\", \"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."}}