{"abstract":"Entity decoding recursively changes literal entity text.","category":"Markup","checks":4,"contract":"Apply exactly one HTML character-reference decoding pass.","contract_signature":"x","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-unescape-once","id":"FA-3221","implementations":{"attempt":{"sha256":"faaa33655412476f74d2e771f41c7093fe03d3b2bd08a6088902703f82c07188","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(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('&amp;lt;'), '&lt;')\ncheck('boundary 2', solve('&#x1F600;'), '😀')\ncheck('boundary 3', solve('&copy;'), '©')\ncheck('boundary 4', solve('&unknown;'), '&unknown;')\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":"6d4e2e9f4bddbec94217be8779f65679b501679dbaa15738091f461cffc13b35","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('&amp;','&').replace('&lt;','<').replace('&gt;','>')\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('&amp;lt;'), '&lt;')\ncheck('boundary 2', solve('&#x1F600;'), '😀')\ncheck('boundary 3', solve('&copy;'), '©')\ncheck('boundary 4', solve('&unknown;'), '&unknown;')\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-unescape-once","generated_at":"2026-09-29T14:37:23.129219+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: Apply exactly one HTML character-reference decoding pass.","sha256":"72ce2889c21d47ae4c0e8a837d1de22a65bb78304072075b83fde562ece6535f","title":"Entity decoding recursively changes literal entity text · 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":61.59,"exit_code":1,"observations":[{"actual":"<","check":"boundary 1","expected":"&lt;","passed":false},{"actual":"😀","check":"boundary 2","expected":"😀","passed":true},{"actual":"©","check":"boundary 3","expected":"©","passed":true},{"actual":"&unknown;","check":"boundary 4","expected":"&unknown;","passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": \"<\", \"expected\": \"&lt;\", \"passed\": false}, {\"check\": \"boundary 2\", \"actual\": \"😀\", \"expected\": \"😀\", \"passed\": true}, {\"check\": \"boundary 3\", \"actual\": \"©\", \"expected\": \"©\", \"passed\": true}, {\"check\": \"boundary 4\", \"actual\": \"&unknown;\", \"expected\": \"&unknown;\", \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":61.394,"exit_code":1,"observations":[{"actual":"<","check":"boundary 1","expected":"&lt;","passed":false},{"actual":"&#x1F600;","check":"boundary 2","expected":"😀","passed":false},{"actual":"&copy;","check":"boundary 3","expected":"©","passed":false},{"actual":"&unknown;","check":"boundary 4","expected":"&unknown;","passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": \"<\", \"expected\": \"&lt;\", \"passed\": false}, {\"check\": \"boundary 2\", \"actual\": \"&#x1F600;\", \"expected\": \"😀\", \"passed\": false}, {\"check\": \"boundary 3\", \"actual\": \"&copy;\", \"expected\": \"©\", \"passed\": false}, {\"check\": \"boundary 4\", \"actual\": \"&unknown;\", \"expected\": \"&unknown;\", \"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."}}