{"abstract":"Repeated object members disappear from an ordered representation.","category":"Serialization","checks":4,"contract":"Decode every JSON object to its ordered list of member pairs, preserving duplicates.","contract_signature":"x","evaluation_group":"model-ba03eaaa68ce1e26","failed_approach":"The attempted repair handles the primary example but still violates a separate boundary of the same contract.","family":"xp-json-object-pairs","id":"FA-3171","implementations":{"attempt":{"sha256":"253abb8e4832654d9bc5a6eff0eca9dd5b329d3a0b639210286721bf6ba52308","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nimport re, unicodedata, json, csv, io, html, base64, binascii, codecs, struct\nfrom urllib.parse import quote, unquote, unquote_to_bytes, urlencode, parse_qsl, urlsplit, urlunsplit\nfrom email.header import decode_header, make_header\nfrom email.utils import getaddresses\nfrom xml.etree import ElementTree as ET\nimport shlex, string, textwrap\n\nN = 1\nobservations = []\ndef solve(x):\n    try:\n        return list(json.loads(x).items())\n    except Exception as exc:\n        return {\"error\": type(exc).__name__}\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('boundary 1', solve('{\"a\":1,\"a\":2}'), [['a', 1], ['a', 2]])\ncheck('boundary 2', solve('{\"x\":{\"z\":0}}'), [['x', [['z', 0]]]])\ncheck('boundary 3', solve('{}'), [])\ncheck('boundary 4', solve('{\"b\":2,\"a\":1}'), [['b', 2], ['a', 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":"0e0528e22bb442cf48dc8f266e0ef58b9becc6497d1fd3e4d3db171885ca406b","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nimport re, unicodedata, json, csv, io, html, base64, binascii, codecs, struct\nfrom urllib.parse import quote, unquote, unquote_to_bytes, urlencode, parse_qsl, urlsplit, urlunsplit\nfrom email.header import decode_header, make_header\nfrom email.utils import getaddresses\nfrom xml.etree import ElementTree as ET\nimport shlex, string, textwrap\n\nN = 1\nobservations = []\ndef solve(x):\n    try:\n        return json.loads(x)\n    except Exception as exc:\n        return {\"error\": type(exc).__name__}\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('boundary 1', solve('{\"a\":1,\"a\":2}'), [['a', 1], ['a', 2]])\ncheck('boundary 2', solve('{\"x\":{\"z\":0}}'), [['x', [['z', 0]]]])\ncheck('boundary 3', solve('{}'), [])\ncheck('boundary 4', solve('{\"b\":2,\"a\":1}'), [['b', 2], ['a', 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":" 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":"xp-json-object-pairs","generated_at":"2026-09-29T14:37:22.260764+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"A local executable model for consumers of structured text; oracle values are authored literals, not outputs copied from the repaired implementation.","root_cause":"The implementation applies an operation whose text or grammar semantics violate this contract: Decode every JSON object to its ordered list of member pairs, preserving duplicates.","sha256":"26f48d4c2d9ae9cc1177e903339cf12f25b50d41bc357c270fa2d2996fe1b952","title":"Repeated object members disappear from an ordered representation · 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":57.101,"exit_code":1,"observations":[{"actual":[["a",2]],"check":"boundary 1","expected":[["a",1],["a",2]],"passed":false},{"actual":[["x",{"z":0}]],"check":"boundary 2","expected":[["x",[["z",0]]]],"passed":false},{"actual":[],"check":"boundary 3","expected":[],"passed":true},{"actual":[["b",2],["a",1]],"check":"boundary 4","expected":[["b",2],["a",1]],"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": [[\"a\", 2]], \"expected\": [[\"a\", 1], [\"a\", 2]], \"passed\": false}, {\"check\": \"boundary 2\", \"actual\": [[\"x\", {\"z\": 0}]], \"expected\": [[\"x\", [[\"z\", 0]]]], \"passed\": false}, {\"check\": \"boundary 3\", \"actual\": [], \"expected\": [], \"passed\": true}, {\"check\": \"boundary 4\", \"actual\": [[\"b\", 2], [\"a\", 1]], \"expected\": [[\"b\", 2], [\"a\", 1]], \"passed\": false}], \"passed\": false}\n"},"broken":{"elapsed_ms":53.969,"exit_code":1,"observations":[{"actual":{"a":2},"check":"boundary 1","expected":[["a",1],["a",2]],"passed":false},{"actual":{"x":{"z":0}},"check":"boundary 2","expected":[["x",[["z",0]]]],"passed":false},{"actual":{},"check":"boundary 3","expected":[],"passed":false},{"actual":{"a":1,"b":2},"check":"boundary 4","expected":[["b",2],["a",1]],"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": {\"a\": 2}, \"expected\": [[\"a\", 1], [\"a\", 2]], \"passed\": false}, {\"check\": \"boundary 2\", \"actual\": {\"x\": {\"z\": 0}}, \"expected\": [[\"x\", [[\"z\", 0]]]], \"passed\": false}, {\"check\": \"boundary 3\", \"actual\": {}, \"expected\": [], \"passed\": false}, {\"check\": \"boundary 4\", \"actual\": {\"b\": 2, \"a\": 1}, \"expected\": [[\"b\", 2], [\"a\", 1]], \"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."}}