{"abstract":"Windows punctuation decodes as controls.","category":"Encodings","checks":4,"contract":"Decode defined Windows-1252 bytes; replace undefined bytes.","contract_signature":"x","evaluation_group":"model-bf3f98bc01721958","failed_approach":"The attempted repair handles the primary example but still violates a separate boundary of the same contract.","family":"xp-cp1252-punctuation","id":"FA-2956","implementations":{"attempt":{"sha256":"5b3bbc94e837e1d9abe6d2b8fef4bb4953f2c68c408842f8ddde556dba454d28","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'), '€')\ncheck('boundary 2', solve('9394'), '“”')\ncheck('boundary 3', solve('81'), '�')\ncheck('boundary 4', solve('41'), '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":"aa6bd683dde8a47b19d21d4a91b3d67fc74fe7417a9833eb75e903e5023c3d8f","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('latin1')\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'), '€')\ncheck('boundary 2', solve('9394'), '“”')\ncheck('boundary 3', solve('81'), '�')\ncheck('boundary 4', solve('41'), '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-cp1252-punctuation","generated_at":"2026-09-29T14:37:19.513084+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: Decode defined Windows-1252 bytes; replace undefined bytes.","sha256":"650fb4cd7fc934d39417a691cc69eff25d37047c9977937e68789ba0427920ec","title":"Windows punctuation decodes as controls · 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":110.355,"exit_code":1,"observations":[{"actual":"�","check":"boundary 1","expected":"€","passed":false},{"actual":"��","check":"boundary 2","expected":"“”","passed":false},{"actual":"�","check":"boundary 3","expected":"�","passed":true},{"actual":"A","check":"boundary 4","expected":"A","passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": \"�\", \"expected\": \"€\", \"passed\": false}, {\"check\": \"boundary 2\", \"actual\": \"��\", \"expected\": \"“”\", \"passed\": false}, {\"check\": \"boundary 3\", \"actual\": \"�\", \"expected\": \"�\", \"passed\": true}, {\"check\": \"boundary 4\", \"actual\": \"A\", \"expected\": \"A\", \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":57.036,"exit_code":1,"observations":[{"actual":"€","check":"boundary 1","expected":"€","passed":false},{"actual":"“”","check":"boundary 2","expected":"“”","passed":false},{"actual":"","check":"boundary 3","expected":"�","passed":false},{"actual":"A","check":"boundary 4","expected":"A","passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": \"€\", \"expected\": \"€\", \"passed\": false}, {\"check\": \"boundary 2\", \"actual\": \"“”\", \"expected\": \"“”\", \"passed\": false}, {\"check\": \"boundary 3\", \"actual\": \"\", \"expected\": \"�\", \"passed\": false}, {\"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."}}