{"abstract":"A malformed member invalidates the whole stipulated strict range list.","category":"HTTP ranges","checks":6,"contract":"Parsed entries are valid [start,end] pairs or None. Return list intact when nonempty and all valid; otherwise None, never silently filter malformed members.","evaluation_group":"s3-http_ranges-request-fields","failed_approach":"The partial repair uses return parsed if parsed else None, which still violates the stated contract.","family":"s3-http_ranges-range-list-invalid-member-policy","id":"FA-26681","implementations":{"attempt":{"sha256":"50766f1bce80cdfb536090a54f83cc1ed321f540e4f3ebd2fe10cc6da29ac2a9","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(parsed):\n    return parsed if parsed else None\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('range-list-invalid-member-policy fixture 0', solve([[0,N],None]), None)\ncheck('range-list-invalid-member-policy fixture 1', solve([None]), None)\ncheck('range-list-invalid-member-policy fixture 2', solve([]), None)\ncheck('range-list-invalid-member-policy fixture 3', solve([[0,N]]), [[0,N]])\ncheck('range-list-invalid-member-policy fixture 4', solve([[0,0],[2,3]]), [[0,0],[2,3]])\ncheck('range-list-invalid-member-policy fixture 5', solve([[N,N],[0,1]]), [[N,N],[0,1]])\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":"8fe18553f4200a04f6abb2ff9c9d59039d3d85da38c9e913ea7d7c13769ce863","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(parsed):\n    return [p for p in parsed if p is not None]\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('range-list-invalid-member-policy fixture 0', solve([[0,N],None]), None)\ncheck('range-list-invalid-member-policy fixture 1', solve([None]), None)\ncheck('range-list-invalid-member-policy fixture 2', solve([]), None)\ncheck('range-list-invalid-member-policy fixture 3', solve([[0,N]]), [[0,N]])\ncheck('range-list-invalid-member-policy fixture 4', solve([[0,0],[2,3]]), [[0,0],[2,3]])\ncheck('range-list-invalid-member-policy fixture 5', solve([[N,N],[0,1]]), [[N,N],[0,1]])\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"},"fixed":{"sha256":"39efc3f6ddd2812c2c4e623c3ad62a0f1eb6dd4133fe719011f96cbcf9a69d0d","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(parsed):\n    return parsed if parsed and all(p is not None for p in parsed) else None\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('range-list-invalid-member-policy fixture 0', solve([[0,N],None]), None)\ncheck('range-list-invalid-member-policy fixture 1', solve([None]), None)\ncheck('range-list-invalid-member-policy fixture 2', solve([]), None)\ncheck('range-list-invalid-member-policy fixture 3', solve([[0,N]]), [[0,N]])\ncheck('range-list-invalid-member-policy fixture 4', solve([[0,0],[2,3]]), [[0,0],[2,3]])\ncheck('range-list-invalid-member-policy fixture 5', solve([[N,N],[0,1]]), [[N,N],[0,1]])\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-list-invalid-member-policy","generated_at":"2026-09-29T14:41:18.156641+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.","repair":"Apply the bounded decision exactly: return parsed if parsed and all(p is not None for p in parsed) else None","root_cause":"The range-list-invalid-member-policy decision uses return [p for p in parsed if p is not None].","sha256":"c541b4e6d9ad8b7a60e845a0971cf1450df503f210de4c84602b980ba08db64a","title":"A malformed member invalidates the whole stipulated strict range list · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verification":{"attempt":{"elapsed_ms":40.13,"exit_code":1,"observations":[{"actual":[[0,1],null],"check":"range-list-invalid-member-policy fixture 0","expected":null,"passed":false},{"actual":[null],"check":"range-list-invalid-member-policy fixture 1","expected":null,"passed":false},{"actual":null,"check":"range-list-invalid-member-policy fixture 2","expected":null,"passed":true},{"actual":[[0,1]],"check":"range-list-invalid-member-policy fixture 3","expected":[[0,1]],"passed":true},{"actual":[[0,0],[2,3]],"check":"range-list-invalid-member-policy fixture 4","expected":[[0,0],[2,3]],"passed":true},{"actual":[[1,1],[0,1]],"check":"range-list-invalid-member-policy fixture 5","expected":[[1,1],[0,1]],"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"range-list-invalid-member-policy fixture 0\", \"actual\": [[0, 1], null], \"expected\": null, \"passed\": false}, {\"check\": \"range-list-invalid-member-policy fixture 1\", \"actual\": [null], \"expected\": null, \"passed\": false}, {\"check\": \"range-list-invalid-member-policy fixture 2\", \"actual\": null, \"expected\": null, \"passed\": true}, {\"check\": \"range-list-invalid-member-policy fixture 3\", \"actual\": [[0, 1]], \"expected\": [[0, 1]], \"passed\": true}, {\"check\": \"range-list-invalid-member-policy fixture 4\", \"actual\": [[0, 0], [2, 3]], \"expected\": [[0, 0], [2, 3]], \"passed\": true}, {\"check\": \"range-list-invalid-member-policy fixture 5\", \"actual\": [[1, 1], [0, 1]], \"expected\": [[1, 1], [0, 1]], \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":37.595,"exit_code":1,"observations":[{"actual":[[0,1]],"check":"range-list-invalid-member-policy fixture 0","expected":null,"passed":false},{"actual":[],"check":"range-list-invalid-member-policy fixture 1","expected":null,"passed":false},{"actual":[],"check":"range-list-invalid-member-policy fixture 2","expected":null,"passed":false},{"actual":[[0,1]],"check":"range-list-invalid-member-policy fixture 3","expected":[[0,1]],"passed":true},{"actual":[[0,0],[2,3]],"check":"range-list-invalid-member-policy fixture 4","expected":[[0,0],[2,3]],"passed":true},{"actual":[[1,1],[0,1]],"check":"range-list-invalid-member-policy fixture 5","expected":[[1,1],[0,1]],"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"range-list-invalid-member-policy fixture 0\", \"actual\": [[0, 1]], \"expected\": null, \"passed\": false}, {\"check\": \"range-list-invalid-member-policy fixture 1\", \"actual\": [], \"expected\": null, \"passed\": false}, {\"check\": \"range-list-invalid-member-policy fixture 2\", \"actual\": [], \"expected\": null, \"passed\": false}, {\"check\": \"range-list-invalid-member-policy fixture 3\", \"actual\": [[0, 1]], \"expected\": [[0, 1]], \"passed\": true}, {\"check\": \"range-list-invalid-member-policy fixture 4\", \"actual\": [[0, 0], [2, 3]], \"expected\": [[0, 0], [2, 3]], \"passed\": true}, {\"check\": \"range-list-invalid-member-policy fixture 5\", \"actual\": [[1, 1], [0, 1]], \"expected\": [[1, 1], [0, 1]], \"passed\": true}], \"passed\": false}\n"},"fixed":{"elapsed_ms":40.306,"exit_code":0,"observations":[{"actual":null,"check":"range-list-invalid-member-policy fixture 0","expected":null,"passed":true},{"actual":null,"check":"range-list-invalid-member-policy fixture 1","expected":null,"passed":true},{"actual":null,"check":"range-list-invalid-member-policy fixture 2","expected":null,"passed":true},{"actual":[[0,1]],"check":"range-list-invalid-member-policy fixture 3","expected":[[0,1]],"passed":true},{"actual":[[0,0],[2,3]],"check":"range-list-invalid-member-policy fixture 4","expected":[[0,0],[2,3]],"passed":true},{"actual":[[1,1],[0,1]],"check":"range-list-invalid-member-policy fixture 5","expected":[[1,1],[0,1]],"passed":true}],"passed":true,"stderr":"","stdout":"{\"observations\": [{\"check\": \"range-list-invalid-member-policy fixture 0\", \"actual\": null, \"expected\": null, \"passed\": true}, {\"check\": \"range-list-invalid-member-policy fixture 1\", \"actual\": null, \"expected\": null, \"passed\": true}, {\"check\": \"range-list-invalid-member-policy fixture 2\", \"actual\": null, \"expected\": null, \"passed\": true}, {\"check\": \"range-list-invalid-member-policy fixture 3\", \"actual\": [[0, 1]], \"expected\": [[0, 1]], \"passed\": true}, {\"check\": \"range-list-invalid-member-policy fixture 4\", \"actual\": [[0, 0], [2, 3]], \"expected\": [[0, 0], [2, 3]], \"passed\": true}, {\"check\": \"range-list-invalid-member-policy fixture 5\", \"actual\": [[1, 1], [0, 1]], \"expected\": [[1, 1], [0, 1]], \"passed\": true}], \"passed\": true}\n"}},"verified":true,"visibility":"public"}