{"abstract":"Entity decoding keeps only the first resulting codepoint.","category":"Markup","checks":4,"contract":"Decode HTML entities, retaining combining and multi-codepoint mappings.","evaluation_group":"model-12bcdf48fec8205a","failed_approach":"The attempted repair handles the primary example but still violates a separate boundary of the same contract.","family":"xp-html-multicodepoint-entity","id":"FA-3991","implementations":{"attempt":{"sha256":"64fc90649c1d5174593866d3481a4b764196bd24e26b0b3d1c086d7e70c01e55","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 for c in html.unescape(x) if not unicodedata.combining(c))\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('≂̸'), '≂̸')\ncheck('boundary 2', solve('fj'), 'fj')\ncheck('boundary 3', solve('&'), '&')\ncheck('boundary 4', solve('abc'), 'abc')\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":"554a27d2933632ea7a06faa3c13055f4e49b081e8c235d46589363986cd9c188","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(html.unescape(v)[0] if v.startswith('&') and html.unescape(v) else v for v in re.split(r'(&[^;]+;)',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('≂̸'), '≂̸')\ncheck('boundary 2', solve('fj'), 'fj')\ncheck('boundary 3', solve('&'), '&')\ncheck('boundary 4', solve('abc'), 'abc')\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":"c31c3325e897dbe7d6068bd132605b74fe5c0308a0b74d7a1521bf1c260d24f5","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 html.unescape(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('≂̸'), '≂̸')\ncheck('boundary 2', solve('fj'), 'fj')\ncheck('boundary 3', solve('&'), '&')\ncheck('boundary 4', solve('abc'), 'abc')\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-html-multicodepoint-entity","generated_at":"2026-09-29T14:37:33.921501+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: Decode HTML entities, retaining combining and multi-codepoint mappings.","root_cause":"The implementation applies an operation whose text or grammar semantics violate this contract: Decode HTML entities, retaining combining and multi-codepoint mappings.","sha256":"c5a93d5ab91aeb0ff647dbeed6bfad1dd6b4f5c2ee0bda6b24b5af2d9bd18328","title":"Entity decoding keeps only the first resulting codepoint · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verification":{"attempt":{"elapsed_ms":56.96,"exit_code":1,"observations":[{"actual":"≂","check":"boundary 1","expected":"≂̸","passed":false},{"actual":"fj","check":"boundary 2","expected":"fj","passed":true},{"actual":"&","check":"boundary 3","expected":"&","passed":true},{"actual":"abc","check":"boundary 4","expected":"abc","passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": \"≂\", \"expected\": \"≂̸\", \"passed\": false}, {\"check\": \"boundary 2\", \"actual\": \"fj\", \"expected\": \"fj\", \"passed\": true}, {\"check\": \"boundary 3\", \"actual\": \"&\", \"expected\": \"&\", \"passed\": true}, {\"check\": \"boundary 4\", \"actual\": \"abc\", \"expected\": \"abc\", \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":58.05,"exit_code":1,"observations":[{"actual":"≂","check":"boundary 1","expected":"≂̸","passed":false},{"actual":"f","check":"boundary 2","expected":"fj","passed":false},{"actual":"&","check":"boundary 3","expected":"&","passed":true},{"actual":"abc","check":"boundary 4","expected":"abc","passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": \"≂\", \"expected\": \"≂̸\", \"passed\": false}, {\"check\": \"boundary 2\", \"actual\": \"f\", \"expected\": \"fj\", \"passed\": false}, {\"check\": \"boundary 3\", \"actual\": \"&\", \"expected\": \"&\", \"passed\": true}, {\"check\": \"boundary 4\", \"actual\": \"abc\", \"expected\": \"abc\", \"passed\": true}], \"passed\": false}\n"},"fixed":{"elapsed_ms":57.561,"exit_code":0,"observations":[{"actual":"≂̸","check":"boundary 1","expected":"≂̸","passed":true},{"actual":"fj","check":"boundary 2","expected":"fj","passed":true},{"actual":"&","check":"boundary 3","expected":"&","passed":true},{"actual":"abc","check":"boundary 4","expected":"abc","passed":true}],"passed":true,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": \"≂̸\", \"expected\": \"≂̸\", \"passed\": true}, {\"check\": \"boundary 2\", \"actual\": \"fj\", \"expected\": \"fj\", \"passed\": true}, {\"check\": \"boundary 3\", \"actual\": \"&\", \"expected\": \"&\", \"passed\": true}, {\"check\": \"boundary 4\", \"actual\": \"abc\", \"expected\": \"abc\", \"passed\": true}], \"passed\": true}\n"}},"verified":true,"visibility":"public"}