{"abstract":"Latin-1 bytes are decoded through a typographic code page.","category":"Encodings","checks":4,"contract":"Decode every byte one-to-one as ISO-8859-1.","evaluation_group":"model-3d223f42dc651732","failed_approach":"The attempted repair handles the primary example but still violates a separate boundary of the same contract.","family":"xp-latin1-total-map","id":"FA-2951","implementations":{"attempt":{"sha256":"5f2b4a0b2569b22cae28fb4bbca4c3f7fc7dd3521ef40326c2f7a557576f2dc5","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 bytes.fromhex(x).decode('cp1252','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('80'), '\\x80')\ncheck('boundary 2', solve('ff'), 'ÿ')\ncheck('boundary 3', solve('41'), 'A')\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":"53d7f37759fcf9aeabacb2689bba510b54c47bbe804f3ac1d03ef87467e2c052","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 bytes.fromhex(x).decode('utf-8','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('80'), '\\x80')\ncheck('boundary 2', solve('ff'), 'ÿ')\ncheck('boundary 3', solve('41'), 'A')\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":"1078122582e0f7ecdd7e84eaf54174a1401f86ab87f8000d42dd96140a3687b5","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 bytes.fromhex(x).decode('latin-1')\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('80'), '\\x80')\ncheck('boundary 2', solve('ff'), 'ÿ')\ncheck('boundary 3', solve('41'), 'A')\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-latin1-total-map","generated_at":"2026-09-29T14:37:19.514578+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 every byte one-to-one as ISO-8859-1.","root_cause":"The implementation applies an operation whose text or grammar semantics violate this contract: Decode every byte one-to-one as ISO-8859-1.","sha256":"c209967f3d026d0facbf3f1f78e4eff7b7f4f2342fa6496b0ebeee1bea5a0475","title":"Latin-1 bytes are decoded through a typographic code page · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verification":{"attempt":{"elapsed_ms":116.261,"exit_code":1,"observations":[{"actual":"€","check":"boundary 1","expected":"€","passed":false},{"actual":"ÿ","check":"boundary 2","expected":"ÿ","passed":true},{"actual":"A","check":"boundary 3","expected":"A","passed":true},{"actual":"","check":"boundary 4","expected":"","passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": \"€\", \"expected\": \"€\", \"passed\": false}, {\"check\": \"boundary 2\", \"actual\": \"ÿ\", \"expected\": \"ÿ\", \"passed\": true}, {\"check\": \"boundary 3\", \"actual\": \"A\", \"expected\": \"A\", \"passed\": true}, {\"check\": \"boundary 4\", \"actual\": \"\", \"expected\": \"\", \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":57.319,"exit_code":1,"observations":[{"actual":"�","check":"boundary 1","expected":"€","passed":false},{"actual":"�","check":"boundary 2","expected":"ÿ","passed":false},{"actual":"A","check":"boundary 3","expected":"A","passed":true},{"actual":"","check":"boundary 4","expected":"","passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": \"�\", \"expected\": \"€\", \"passed\": false}, {\"check\": \"boundary 2\", \"actual\": \"�\", \"expected\": \"ÿ\", \"passed\": false}, {\"check\": \"boundary 3\", \"actual\": \"A\", \"expected\": \"A\", \"passed\": true}, {\"check\": \"boundary 4\", \"actual\": \"\", \"expected\": \"\", \"passed\": true}], \"passed\": false}\n"},"fixed":{"elapsed_ms":53.42,"exit_code":0,"observations":[{"actual":"€","check":"boundary 1","expected":"€","passed":true},{"actual":"ÿ","check":"boundary 2","expected":"ÿ","passed":true},{"actual":"A","check":"boundary 3","expected":"A","passed":true},{"actual":"","check":"boundary 4","expected":"","passed":true}],"passed":true,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": \"€\", \"expected\": \"€\", \"passed\": true}, {\"check\": \"boundary 2\", \"actual\": \"ÿ\", \"expected\": \"ÿ\", \"passed\": true}, {\"check\": \"boundary 3\", \"actual\": \"A\", \"expected\": \"A\", \"passed\": true}, {\"check\": \"boundary 4\", \"actual\": \"\", \"expected\": \"\", \"passed\": true}], \"passed\": true}\n"}},"verified":true,"visibility":"public"}