{"abstract":"An astral scalar is escaped as a single invalid JSON escape.","category":"Serialization","checks":4,"contract":"Serialize strings as ASCII-only JSON using surrogate pairs when needed.","contract_signature":"x","evaluation_group":"model-db284a6185bbbd53","failed_approach":"The attempted repair handles the primary example but still violates a separate boundary of the same contract.","family":"xp-json-ascii-surrogates","id":"FA-3141","implementations":{"attempt":{"sha256":"245683a7b4470dba2f33b849b2c3892da9256bd0eb25f963ff648992db0e9743","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 '\"'+''.join(c if ord(c)<128 else '\\\\u%04x'%ord(c) for c in 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('😀'), '\"\\\\ud83d\\\\ude00\"')\ncheck('boundary 2', solve('é'), '\"\\\\u00e9\"')\ncheck('boundary 3', solve('\\n'), '\"\\\\n\"')\ncheck('boundary 4', solve('a'), '\"a\"')\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":"161947bd98cfbb99c3345a10b115753318702b07abecd06ae8effa5fcbd2e63d","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('😀'), '\"\\\\ud83d\\\\ude00\"')\ncheck('boundary 2', solve('é'), '\"\\\\u00e9\"')\ncheck('boundary 3', solve('\\n'), '\"\\\\n\"')\ncheck('boundary 4', solve('a'), '\"a\"')\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-ascii-surrogates","generated_at":"2026-09-29T14:37:21.701412+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: Serialize strings as ASCII-only JSON using surrogate pairs when needed.","sha256":"f39572172283260493daceb1d0f6de85f81ac5bf10ee6a97897d256cd54fde75","title":"An astral scalar is escaped as a single invalid JSON escape · 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":64.074,"exit_code":1,"observations":[{"actual":"\"\\u1f600\"","check":"boundary 1","expected":"\"\\ud83d\\ude00\"","passed":false},{"actual":"\"\\u00e9\"","check":"boundary 2","expected":"\"\\u00e9\"","passed":true},{"actual":"\"\n\"","check":"boundary 3","expected":"\"\\n\"","passed":false},{"actual":"\"a\"","check":"boundary 4","expected":"\"a\"","passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": \"\\\"\\\\u1f600\\\"\", \"expected\": \"\\\"\\\\ud83d\\\\ude00\\\"\", \"passed\": false}, {\"check\": \"boundary 2\", \"actual\": \"\\\"\\\\u00e9\\\"\", \"expected\": \"\\\"\\\\u00e9\\\"\", \"passed\": true}, {\"check\": \"boundary 3\", \"actual\": \"\\\"\\n\\\"\", \"expected\": \"\\\"\\\\n\\\"\", \"passed\": false}, {\"check\": \"boundary 4\", \"actual\": \"\\\"a\\\"\", \"expected\": \"\\\"a\\\"\", \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":56.869,"exit_code":1,"observations":[{"actual":"\"😀\"","check":"boundary 1","expected":"\"\\ud83d\\ude00\"","passed":false},{"actual":"\"é\"","check":"boundary 2","expected":"\"\\u00e9\"","passed":false},{"actual":"\"\\n\"","check":"boundary 3","expected":"\"\\n\"","passed":true},{"actual":"\"a\"","check":"boundary 4","expected":"\"a\"","passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": \"\\\"😀\\\"\", \"expected\": \"\\\"\\\\ud83d\\\\ude00\\\"\", \"passed\": false}, {\"check\": \"boundary 2\", \"actual\": \"\\\"é\\\"\", \"expected\": \"\\\"\\\\u00e9\\\"\", \"passed\": false}, {\"check\": \"boundary 3\", \"actual\": \"\\\"\\\\n\\\"\", \"expected\": \"\\\"\\\\n\\\"\", \"passed\": true}, {\"check\": \"boundary 4\", \"actual\": \"\\\"a\\\"\", \"expected\": \"\\\"a\\\"\", \"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."}}