{"abstract":"A quoted JSON string contains raw control characters.","category":"Serialization","checks":4,"contract":"Serialize a string as compact JSON with Unicode characters preserved.","evaluation_group":"model-81a36643a7eace34","failed_approach":"The attempted repair handles the primary example but still violates a separate boundary of the same contract.","family":"xp-json-string-escaping","id":"FA-3136","implementations":{"attempt":{"sha256":"8c55395f432f2a718ee7294b4ffb2a1ceeb0e12ad03eeeceb6c4f2068408764d","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 '\"'+x.replace('\\\\','\\\\\\\\').replace('\"','\\\\\"')+'\"'\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\\nb'), '\"a\\\\nb\"')\ncheck('boundary 2', solve('a\"b'), '\"a\\\\\"b\"')\ncheck('boundary 3', solve('é'), '\"é\"')\ncheck('boundary 4', 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":"efedf265cb2eef9102897ebdbfaefc799a96e392e77286e64527733a4c4b3df0","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 '\"'+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\\nb'), '\"a\\\\nb\"')\ncheck('boundary 2', solve('a\"b'), '\"a\\\\\"b\"')\ncheck('boundary 3', solve('é'), '\"é\"')\ncheck('boundary 4', 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"},"fixed":{"sha256":"9127dbc272d0ee7541003be3d4c17c61511851a43e472b90434196e0b7d1c9f7","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.dumps(x,ensure_ascii=False)\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\\nb'), '\"a\\\\nb\"')\ncheck('boundary 2', solve('a\"b'), '\"a\\\\\"b\"')\ncheck('boundary 3', solve('é'), '\"é\"')\ncheck('boundary 4', 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":" 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-string-escaping","generated_at":"2026-09-29T14:37:21.683947+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.","repair":"Implement the complete stated contract, including the boundary fixtures: Serialize a string as compact JSON with Unicode characters preserved.","root_cause":"The implementation applies an operation whose text or grammar semantics violate this contract: Serialize a string as compact JSON with Unicode characters preserved.","sha256":"3e706cd4a94fdf2c0ab31d9adea25878b1039155f5687e1e2044bbdc0b76e845","title":"A quoted JSON string contains raw control characters · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verification":{"attempt":{"elapsed_ms":53.565,"exit_code":1,"observations":[{"actual":"\"a\nb\"","check":"boundary 1","expected":"\"a\\nb\"","passed":false},{"actual":"\"a\\\"b\"","check":"boundary 2","expected":"\"a\\\"b\"","passed":true},{"actual":"\"é\"","check":"boundary 3","expected":"\"é\"","passed":true},{"actual":"\"\"","check":"boundary 4","expected":"\"\"","passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": \"\\\"a\\nb\\\"\", \"expected\": \"\\\"a\\\\nb\\\"\", \"passed\": false}, {\"check\": \"boundary 2\", \"actual\": \"\\\"a\\\\\\\"b\\\"\", \"expected\": \"\\\"a\\\\\\\"b\\\"\", \"passed\": true}, {\"check\": \"boundary 3\", \"actual\": \"\\\"é\\\"\", \"expected\": \"\\\"é\\\"\", \"passed\": true}, {\"check\": \"boundary 4\", \"actual\": \"\\\"\\\"\", \"expected\": \"\\\"\\\"\", \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":55.658,"exit_code":1,"observations":[{"actual":"\"a\nb\"","check":"boundary 1","expected":"\"a\\nb\"","passed":false},{"actual":"\"a\"b\"","check":"boundary 2","expected":"\"a\\\"b\"","passed":false},{"actual":"\"é\"","check":"boundary 3","expected":"\"é\"","passed":true},{"actual":"\"\"","check":"boundary 4","expected":"\"\"","passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": \"\\\"a\\nb\\\"\", \"expected\": \"\\\"a\\\\nb\\\"\", \"passed\": false}, {\"check\": \"boundary 2\", \"actual\": \"\\\"a\\\"b\\\"\", \"expected\": \"\\\"a\\\\\\\"b\\\"\", \"passed\": false}, {\"check\": \"boundary 3\", \"actual\": \"\\\"é\\\"\", \"expected\": \"\\\"é\\\"\", \"passed\": true}, {\"check\": \"boundary 4\", \"actual\": \"\\\"\\\"\", \"expected\": \"\\\"\\\"\", \"passed\": true}], \"passed\": false}\n"},"fixed":{"elapsed_ms":54.694,"exit_code":0,"observations":[{"actual":"\"a\\nb\"","check":"boundary 1","expected":"\"a\\nb\"","passed":true},{"actual":"\"a\\\"b\"","check":"boundary 2","expected":"\"a\\\"b\"","passed":true},{"actual":"\"é\"","check":"boundary 3","expected":"\"é\"","passed":true},{"actual":"\"\"","check":"boundary 4","expected":"\"\"","passed":true}],"passed":true,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": \"\\\"a\\\\nb\\\"\", \"expected\": \"\\\"a\\\\nb\\\"\", \"passed\": true}, {\"check\": \"boundary 2\", \"actual\": \"\\\"a\\\\\\\"b\\\"\", \"expected\": \"\\\"a\\\\\\\"b\\\"\", \"passed\": true}, {\"check\": \"boundary 3\", \"actual\": \"\\\"é\\\"\", \"expected\": \"\\\"é\\\"\", \"passed\": true}, {\"check\": \"boundary 4\", \"actual\": \"\\\"\\\"\", \"expected\": \"\\\"\\\"\", \"passed\": true}], \"passed\": true}\n"}},"verified":true,"visibility":"public"}