{"abstract":"Repeated Range fields combine their member lists under one unit.","category":"HTTP ranges","checks":6,"contract":"Parsed fields are [unit,members]. Return [unit,joined-members] when every unit matches first; mixed units return None; no fields returns None. Units already normalized.","contract_signature":"fields","evaluation_group":"s3-http_ranges-request-fields","failed_approach":"The partial repair uses return [fields[0][0],[m for u,ms in fields for m in ms]] if fields else None, which still violates the stated contract.","family":"s3-http_ranges-range-field-combination","id":"FA-26641","implementations":{"attempt":{"sha256":"c5427fc899540058bd221850a7f9f60842b3218b5c8d3caa7a0c3dfcff2752c4","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(fields):\n    return [fields[0][0],[m for u,ms in fields for m in ms]] if fields else None\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('range-field-combination fixture 0', solve([[\"bytes\",[\"0-\"+str(N)]],[\"bytes\",[\"8-9\"]]]), [\"bytes\",[\"0-\"+str(N),\"8-9\"]])\ncheck('range-field-combination fixture 1', solve([[\"bytes\",[\"0-1\"]],[\"items\",[\"2-3\"]]]), None)\ncheck('range-field-combination fixture 2', solve([]), None)\ncheck('range-field-combination fixture 3', solve([[\"bytes\",[\"0-1\"]]]), [\"bytes\",[\"0-1\"]])\ncheck('range-field-combination fixture 4', solve([[\"items\",[\"a\"]],[\"items\",[\"b\"]]]), [\"items\",[\"a\",\"b\"]])\ncheck('range-field-combination fixture 5', solve([[\"bytes\",[]],[\"bytes\",[\"0-0\"]]]), [\"bytes\",[\"0-0\"]])\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":"f1f62d00f897f9c6532d03633f71d177a9846da384d7186a4ed99fca3714cb6d","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(fields):\n    return fields[0] if fields else None\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('range-field-combination fixture 0', solve([[\"bytes\",[\"0-\"+str(N)]],[\"bytes\",[\"8-9\"]]]), [\"bytes\",[\"0-\"+str(N),\"8-9\"]])\ncheck('range-field-combination fixture 1', solve([[\"bytes\",[\"0-1\"]],[\"items\",[\"2-3\"]]]), None)\ncheck('range-field-combination fixture 2', solve([]), None)\ncheck('range-field-combination fixture 3', solve([[\"bytes\",[\"0-1\"]]]), [\"bytes\",[\"0-1\"]])\ncheck('range-field-combination fixture 4', solve([[\"items\",[\"a\"]],[\"items\",[\"b\"]]]), [\"items\",[\"a\",\"b\"]])\ncheck('range-field-combination fixture 5', solve([[\"bytes\",[]],[\"bytes\",[\"0-0\"]]]), [\"bytes\",[\"0-0\"]])\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-range-field-combination","generated_at":"2026-09-29T14:41:17.815620+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 range-field-combination decision uses return fields[0] if fields else None.","sha256":"432efd319f4b667a3bf22cdedd57ef0f826ae21a724c24e07c73cd31ca5befcf","title":"Repeated Range fields combine their member lists under one unit · 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":39.156,"exit_code":1,"observations":[{"actual":["bytes",["0-1","8-9"]],"check":"range-field-combination fixture 0","expected":["bytes",["0-1","8-9"]],"passed":true},{"actual":["bytes",["0-1","2-3"]],"check":"range-field-combination fixture 1","expected":null,"passed":false},{"actual":null,"check":"range-field-combination fixture 2","expected":null,"passed":true},{"actual":["bytes",["0-1"]],"check":"range-field-combination fixture 3","expected":["bytes",["0-1"]],"passed":true},{"actual":["items",["a","b"]],"check":"range-field-combination fixture 4","expected":["items",["a","b"]],"passed":true},{"actual":["bytes",["0-0"]],"check":"range-field-combination fixture 5","expected":["bytes",["0-0"]],"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"range-field-combination fixture 0\", \"actual\": [\"bytes\", [\"0-1\", \"8-9\"]], \"expected\": [\"bytes\", [\"0-1\", \"8-9\"]], \"passed\": true}, {\"check\": \"range-field-combination fixture 1\", \"actual\": [\"bytes\", [\"0-1\", \"2-3\"]], \"expected\": null, \"passed\": false}, {\"check\": \"range-field-combination fixture 2\", \"actual\": null, \"expected\": null, \"passed\": true}, {\"check\": \"range-field-combination fixture 3\", \"actual\": [\"bytes\", [\"0-1\"]], \"expected\": [\"bytes\", [\"0-1\"]], \"passed\": true}, {\"check\": \"range-field-combination fixture 4\", \"actual\": [\"items\", [\"a\", \"b\"]], \"expected\": [\"items\", [\"a\", \"b\"]], \"passed\": true}, {\"check\": \"range-field-combination fixture 5\", \"actual\": [\"bytes\", [\"0-0\"]], \"expected\": [\"bytes\", [\"0-0\"]], \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":37.608,"exit_code":1,"observations":[{"actual":["bytes",["0-1"]],"check":"range-field-combination fixture 0","expected":["bytes",["0-1","8-9"]],"passed":false},{"actual":["bytes",["0-1"]],"check":"range-field-combination fixture 1","expected":null,"passed":false},{"actual":null,"check":"range-field-combination fixture 2","expected":null,"passed":true},{"actual":["bytes",["0-1"]],"check":"range-field-combination fixture 3","expected":["bytes",["0-1"]],"passed":true},{"actual":["items",["a"]],"check":"range-field-combination fixture 4","expected":["items",["a","b"]],"passed":false},{"actual":["bytes",[]],"check":"range-field-combination fixture 5","expected":["bytes",["0-0"]],"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"range-field-combination fixture 0\", \"actual\": [\"bytes\", [\"0-1\"]], \"expected\": [\"bytes\", [\"0-1\", \"8-9\"]], \"passed\": false}, {\"check\": \"range-field-combination fixture 1\", \"actual\": [\"bytes\", [\"0-1\"]], \"expected\": null, \"passed\": false}, {\"check\": \"range-field-combination fixture 2\", \"actual\": null, \"expected\": null, \"passed\": true}, {\"check\": \"range-field-combination fixture 3\", \"actual\": [\"bytes\", [\"0-1\"]], \"expected\": [\"bytes\", [\"0-1\"]], \"passed\": true}, {\"check\": \"range-field-combination fixture 4\", \"actual\": [\"items\", [\"a\"]], \"expected\": [\"items\", [\"a\", \"b\"]], \"passed\": false}, {\"check\": \"range-field-combination fixture 5\", \"actual\": [\"bytes\", []], \"expected\": [\"bytes\", [\"0-0\"]], \"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."}}