{"abstract":"ASCII85 expands the zero tuple incorrectly.","category":"Encodings","checks":4,"contract":"Encode ASCII85 using the zero-tuple z abbreviation without Adobe wrapping.","contract_signature":"x","evaluation_group":"model-65437ac1ddf53b45","failed_approach":"The attempted repair handles the primary example but still violates a separate boundary of the same contract.","family":"xp-ascii85-zero-abbreviation","id":"FA-3326","implementations":{"attempt":{"sha256":"94bfcc0dd9c1630e2bb5024f89b3d364a47d39c31bba04abd44ced36ab01ebff","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 base64.a85encode(bytes.fromhex(x)).decode().replace('z','!!!!!')\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('00000000'), 'z')\ncheck('boundary 2', solve('61'), '@/')\ncheck('boundary 3', solve('0000000000000000'), 'zz')\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":"9312144a150d347b97242f74fc93fe6c0b0acb032ba03c7f00eb7d41161ddf84","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 base64.b85encode(bytes.fromhex(x)).decode()\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('00000000'), 'z')\ncheck('boundary 2', solve('61'), '@/')\ncheck('boundary 3', solve('0000000000000000'), 'zz')\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-ascii85-zero-abbreviation","generated_at":"2026-09-29T14:37:24.398812+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: Encode ASCII85 using the zero-tuple z abbreviation without Adobe wrapping.","sha256":"79f5e522ebfeff0e0efb4b40a4ccac88942d7e46e4e07282fad5cdf3dde886c4","title":"ASCII85 expands the zero tuple incorrectly · 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":51.563,"exit_code":1,"observations":[{"actual":"!!!!!","check":"boundary 1","expected":"z","passed":false},{"actual":"@/","check":"boundary 2","expected":"@/","passed":true},{"actual":"!!!!!!!!!!","check":"boundary 3","expected":"zz","passed":false},{"actual":"","check":"boundary 4","expected":"","passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": \"!!!!!\", \"expected\": \"z\", \"passed\": false}, {\"check\": \"boundary 2\", \"actual\": \"@/\", \"expected\": \"@/\", \"passed\": true}, {\"check\": \"boundary 3\", \"actual\": \"!!!!!!!!!!\", \"expected\": \"zz\", \"passed\": false}, {\"check\": \"boundary 4\", \"actual\": \"\", \"expected\": \"\", \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":121.216,"exit_code":1,"observations":[{"actual":"00000","check":"boundary 1","expected":"z","passed":false},{"actual":"VE","check":"boundary 2","expected":"@/","passed":false},{"actual":"0000000000","check":"boundary 3","expected":"zz","passed":false},{"actual":"","check":"boundary 4","expected":"","passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": \"00000\", \"expected\": \"z\", \"passed\": false}, {\"check\": \"boundary 2\", \"actual\": \"VE\", \"expected\": \"@/\", \"passed\": false}, {\"check\": \"boundary 3\", \"actual\": \"0000000000\", \"expected\": \"zz\", \"passed\": false}, {\"check\": \"boundary 4\", \"actual\": \"\", \"expected\": \"\", \"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."}}