{"abstract":"Human Base32 digit aliases are rejected.","category":"Encodings","checks":4,"contract":"Decode uppercase Base32 permitting 0 as O and 1 as I; invalid input returns None.","contract_signature":"x","evaluation_group":"model-779c63cd9e23ac64","failed_approach":"The attempted repair handles the primary example but still violates a separate boundary of the same contract.","family":"xp-base32-ambiguous-map","id":"FA-3316","implementations":{"attempt":{"sha256":"ea050cfd0eaf049ce612190ef6554bb91b9def678a6c216399eecffa4f429b8c","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        try:\n            return list(base64.b32decode(x,map01='L'))\n        except binascii.Error:\n            return None\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('1A======'), [64])\ncheck('boundary 2', solve('0A======'), [112])\ncheck('boundary 3', solve('ME======'), [97])\ncheck('boundary 4', solve('?'), None)\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":"6d35716402e413c4ee94f550921ec8d55814b95e3ecddfc640fd7936c0512bda","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        try:\n            return list(base64.b32decode(x))\n        except binascii.Error:\n            return None\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('1A======'), [64])\ncheck('boundary 2', solve('0A======'), [112])\ncheck('boundary 3', solve('ME======'), [97])\ncheck('boundary 4', solve('?'), None)\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-base32-ambiguous-map","generated_at":"2026-09-29T14:37:24.121699+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 uppercase Base32 permitting 0 as O and 1 as I; invalid input returns None.","sha256":"ba96abf30c6b4602e64a62aeb6db1efa7ef94419387e183501195d04da52c47c","title":"Human Base32 digit aliases are rejected · 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":65.92,"exit_code":1,"observations":[{"actual":[88],"check":"boundary 1","expected":[64],"passed":false},{"actual":[112],"check":"boundary 2","expected":[112],"passed":true},{"actual":[97],"check":"boundary 3","expected":[97],"passed":true},{"actual":null,"check":"boundary 4","expected":null,"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": [88], \"expected\": [64], \"passed\": false}, {\"check\": \"boundary 2\", \"actual\": [112], \"expected\": [112], \"passed\": true}, {\"check\": \"boundary 3\", \"actual\": [97], \"expected\": [97], \"passed\": true}, {\"check\": \"boundary 4\", \"actual\": null, \"expected\": null, \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":61.955,"exit_code":1,"observations":[{"actual":null,"check":"boundary 1","expected":[64],"passed":false},{"actual":null,"check":"boundary 2","expected":[112],"passed":false},{"actual":[97],"check":"boundary 3","expected":[97],"passed":true},{"actual":null,"check":"boundary 4","expected":null,"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": null, \"expected\": [64], \"passed\": false}, {\"check\": \"boundary 2\", \"actual\": null, \"expected\": [112], \"passed\": false}, {\"check\": \"boundary 3\", \"actual\": [97], \"expected\": [97], \"passed\": true}, {\"check\": \"boundary 4\", \"actual\": null, \"expected\": null, \"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."}}