{"abstract":"Invisible format controls survive control filtering.","category":"Unicode","checks":4,"contract":"Remove Unicode categories Cc and Cf; preserve spacing and private-use characters.","contract_signature":"x","evaluation_group":"model-deb199bb31e3e6e7","failed_approach":"The attempted repair handles the primary example but still violates a separate boundary of the same contract.","family":"xp-format-vs-control","id":"FA-2926","implementations":{"attempt":{"sha256":"d9c8554923151e518f5645b11d7704d7830f091c99ebb5a724ffcdb67642ebbb","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 ''.join(c for c in x if not unicodedata.category(c).startswith('C'))\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('a\\u200bb'), 'ab')\ncheck('boundary 2', solve('a\\x00b'), 'ab')\ncheck('boundary 3', solve('\\ue000'), '\\ue000')\ncheck('boundary 4', solve('a b'), 'a b')\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":"b07aa2a0edd2c6f5b6dbb7dedb878d9e2c292782d2c4b3eb0c11fa3c07f4fbd1","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 ''.join(c for c in x if unicodedata.category(c)!='Cc')\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('a\\u200bb'), 'ab')\ncheck('boundary 2', solve('a\\x00b'), 'ab')\ncheck('boundary 3', solve('\\ue000'), '\\ue000')\ncheck('boundary 4', solve('a b'), 'a b')\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-format-vs-control","generated_at":"2026-09-29T14:37:18.859143+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: Remove Unicode categories Cc and Cf; preserve spacing and private-use characters.","sha256":"ffdf7becb4a44ec70a5a8b388802ad7aa4aa5358faef851c3b26095915e392d3","title":"Invisible format controls survive control filtering · 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":54.108,"exit_code":1,"observations":[{"actual":"ab","check":"boundary 1","expected":"ab","passed":true},{"actual":"ab","check":"boundary 2","expected":"ab","passed":true},{"actual":"","check":"boundary 3","expected":"","passed":false},{"actual":"a b","check":"boundary 4","expected":"a b","passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": \"ab\", \"expected\": \"ab\", \"passed\": true}, {\"check\": \"boundary 2\", \"actual\": \"ab\", \"expected\": \"ab\", \"passed\": true}, {\"check\": \"boundary 3\", \"actual\": \"\", \"expected\": \"\", \"passed\": false}, {\"check\": \"boundary 4\", \"actual\": \"a b\", \"expected\": \"a b\", \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":52.367,"exit_code":1,"observations":[{"actual":"a​b","check":"boundary 1","expected":"ab","passed":false},{"actual":"ab","check":"boundary 2","expected":"ab","passed":true},{"actual":"","check":"boundary 3","expected":"","passed":true},{"actual":"a b","check":"boundary 4","expected":"a b","passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": \"a​b\", \"expected\": \"ab\", \"passed\": false}, {\"check\": \"boundary 2\", \"actual\": \"ab\", \"expected\": \"ab\", \"passed\": true}, {\"check\": \"boundary 3\", \"actual\": \"\", \"expected\": \"\", \"passed\": true}, {\"check\": \"boundary 4\", \"actual\": \"a b\", \"expected\": \"a b\", \"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."}}