{"abstract":"Compatibility ligatures survive a search key.","category":"Unicode","checks":4,"contract":"Produce NFKC text without case conversion.","contract_signature":"x","evaluation_group":"model-9ad38a64cb1e8edf","failed_approach":"The attempted repair handles the primary example but still violates a separate boundary of the same contract.","family":"xp-nfkc-ligature","id":"FA-2836","implementations":{"attempt":{"sha256":"2f5a9a113bd9f84eceb7673024896065182a1ef029f569b6ab201c1380695fbf","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 x.replace('fi', 'fi')\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('fi'), 'fi')\ncheck('boundary 2', solve('Ａ'), 'A')\ncheck('boundary 3', solve('²'), '2')\ncheck('boundary 4', solve('Ab'), 'Ab')\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":"74d5311910cd408a288e4449ec0b89c051c82a11ea16282e2b87839646babb47","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 unicodedata.normalize('NFC', x)\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('fi'), 'fi')\ncheck('boundary 2', solve('Ａ'), 'A')\ncheck('boundary 3', solve('²'), '2')\ncheck('boundary 4', solve('Ab'), 'Ab')\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-nfkc-ligature","generated_at":"2026-09-29T14:37:17.969810+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: Produce NFKC text without case conversion.","sha256":"5358cd05b477266e4dd5f0bbd0c568b57877bbc065819e827725d6c6bf500b95","title":"Compatibility ligatures survive a search key · 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":59.233,"exit_code":1,"observations":[{"actual":"fi","check":"boundary 1","expected":"fi","passed":true},{"actual":"Ａ","check":"boundary 2","expected":"A","passed":false},{"actual":"²","check":"boundary 3","expected":"2","passed":false},{"actual":"Ab","check":"boundary 4","expected":"Ab","passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": \"fi\", \"expected\": \"fi\", \"passed\": true}, {\"check\": \"boundary 2\", \"actual\": \"Ａ\", \"expected\": \"A\", \"passed\": false}, {\"check\": \"boundary 3\", \"actual\": \"²\", \"expected\": \"2\", \"passed\": false}, {\"check\": \"boundary 4\", \"actual\": \"Ab\", \"expected\": \"Ab\", \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":60.774,"exit_code":1,"observations":[{"actual":"fi","check":"boundary 1","expected":"fi","passed":false},{"actual":"Ａ","check":"boundary 2","expected":"A","passed":false},{"actual":"²","check":"boundary 3","expected":"2","passed":false},{"actual":"Ab","check":"boundary 4","expected":"Ab","passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": \"fi\", \"expected\": \"fi\", \"passed\": false}, {\"check\": \"boundary 2\", \"actual\": \"Ａ\", \"expected\": \"A\", \"passed\": false}, {\"check\": \"boundary 3\", \"actual\": \"²\", \"expected\": \"2\", \"passed\": false}, {\"check\": \"boundary 4\", \"actual\": \"Ab\", \"expected\": \"Ab\", \"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."}}