{"abstract":"An uppercase expansion is truncated during case swap.","category":"Unicode","checks":4,"contract":"Apply Unicode swapcase, retaining multi-character mappings.","contract_signature":"x","evaluation_group":"model-e3640bc2b7763789","failed_approach":"The attempted repair handles the primary example but still violates a separate boundary of the same contract.","family":"xp-swapcase-expansion","id":"FA-2911","implementations":{"attempt":{"sha256":"2f421e2ba1def4b86f1ce2f5807ec1c9095e26303b7eac34ff79e7866946ccb7","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.lower() if c.isupper() else c.upper() for c in 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('ß'), 'SS')\ncheck('boundary 2', solve('Dž'), 'Dž')\ncheck('boundary 3', solve('Ab'), 'aB')\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":"04e2171dcc7fc301166d3caa4f3bbbb9cd2eb0aaa9109c59597d2ba84753b49a","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.lower() if c.isupper() else c.upper()[:1] for c in 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('ß'), 'SS')\ncheck('boundary 2', solve('Dž'), 'Dž')\ncheck('boundary 3', solve('Ab'), 'aB')\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-swapcase-expansion","generated_at":"2026-09-29T14:37:18.855648+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: Apply Unicode swapcase, retaining multi-character mappings.","sha256":"1b4a269c9a329d23236d8c6797639595f816c4a18cea1986574c3f0b1fa6ea66","title":"An uppercase expansion is truncated during case swap · 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":58.622,"exit_code":1,"observations":[{"actual":"SS","check":"boundary 1","expected":"SS","passed":true},{"actual":"DŽ","check":"boundary 2","expected":"Dž","passed":false},{"actual":"aB","check":"boundary 3","expected":"aB","passed":true},{"actual":"!","check":"boundary 4","expected":"!","passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": \"SS\", \"expected\": \"SS\", \"passed\": true}, {\"check\": \"boundary 2\", \"actual\": \"DŽ\", \"expected\": \"Dž\", \"passed\": false}, {\"check\": \"boundary 3\", \"actual\": \"aB\", \"expected\": \"aB\", \"passed\": true}, {\"check\": \"boundary 4\", \"actual\": \"!\", \"expected\": \"!\", \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":50.195,"exit_code":1,"observations":[{"actual":"S","check":"boundary 1","expected":"SS","passed":false},{"actual":"DŽ","check":"boundary 2","expected":"Dž","passed":false},{"actual":"aB","check":"boundary 3","expected":"aB","passed":true},{"actual":"!","check":"boundary 4","expected":"!","passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": \"S\", \"expected\": \"SS\", \"passed\": false}, {\"check\": \"boundary 2\", \"actual\": \"DŽ\", \"expected\": \"Dž\", \"passed\": false}, {\"check\": \"boundary 3\", \"actual\": \"aB\", \"expected\": \"aB\", \"passed\": true}, {\"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."}}