{"abstract":"case variants survive text-key deduplication.","category":"Dataset deduplication grouping","checks":6,"contract":"Return the number of distinct Unicode case-folded strings. Whitespace and punctuation remain significant.","contract_signature":"values","evaluation_group":"dedup-casefold","failed_approach":"Lowercasing and case-folding differ for some Unicode strings.","family":"w3-dataset-deduplication-grouping-casefold-text-key","id":"FA-100241","implementations":{"attempt":{"sha256":"f32fa2802dc08c0461fc7a6887ae4d98d0e0f701dd31b5860dc9820df696936d","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(values):\n    return len({s.lower() for s in values})\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('ASCII case duplicates',solve(['Row'+str(N),'row'+str(N)]),1)\ncheck('Unicode case fold',solve(['ß','SS']),1)\ncheck('punctuation matters',solve(['a-b','ab']),2)\ncheck('empty list',solve([]),0)\ncheck('single value',solve(['X']),1)\ncheck('distinct values',solve(['a','b']),2)\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":"dc6abae5ff1b80d35d57f13b4487db346ee607f0682a3d0247afa7a1f3b5671c","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(values):\n    return len(set(values))\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('ASCII case duplicates',solve(['Row'+str(N),'row'+str(N)]),1)\ncheck('Unicode case fold',solve(['ß','SS']),1)\ncheck('punctuation matters',solve(['a-b','ab']),2)\ncheck('empty list',solve([]),0)\ncheck('single value',solve(['X']),1)\ncheck('distinct values',solve(['a','b']),2)\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":"Inputs are small in-memory fixtures with the stated contract; results do not claim production deduplication quality. 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":"w3-dataset-deduplication-grouping-casefold-text-key","generated_at":"2026-09-30T16:48:33.560815+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"This deterministic toy operation makes one dataset equivalence or representative rule explicit.","root_cause":"The comparison key preserves case despite a case-insensitive identity contract.","sha256":"8f42271a866a08ad346809d71a1f18920074870d9a909f2ecaa30b59b6ea2393","title":"Dataset deduplication: case variants survive text-key deduplication · case 01","variant":1,"variant_policy":"The fixture code references N, supplied as 1 through 5. Fixed boundary checks may repeat. These records share one mechanism and must remain together in evaluation splits.","verified":true,"visibility":"public","verification":{"attempt":{"elapsed_ms":31.169,"exit_code":1,"observations":[{"actual":1,"check":"ASCII case duplicates","expected":1,"passed":true},{"actual":2,"check":"Unicode case fold","expected":1,"passed":false},{"actual":2,"check":"punctuation matters","expected":2,"passed":true},{"actual":0,"check":"empty list","expected":0,"passed":true},{"actual":1,"check":"single value","expected":1,"passed":true},{"actual":2,"check":"distinct values","expected":2,"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"ASCII case duplicates\", \"actual\": 1, \"expected\": 1, \"passed\": true}, {\"check\": \"Unicode case fold\", \"actual\": 2, \"expected\": 1, \"passed\": false}, {\"check\": \"punctuation matters\", \"actual\": 2, \"expected\": 2, \"passed\": true}, {\"check\": \"empty list\", \"actual\": 0, \"expected\": 0, \"passed\": true}, {\"check\": \"single value\", \"actual\": 1, \"expected\": 1, \"passed\": true}, {\"check\": \"distinct values\", \"actual\": 2, \"expected\": 2, \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":30.847,"exit_code":1,"observations":[{"actual":2,"check":"ASCII case duplicates","expected":1,"passed":false},{"actual":2,"check":"Unicode case fold","expected":1,"passed":false},{"actual":2,"check":"punctuation matters","expected":2,"passed":true},{"actual":0,"check":"empty list","expected":0,"passed":true},{"actual":1,"check":"single value","expected":1,"passed":true},{"actual":2,"check":"distinct values","expected":2,"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"ASCII case duplicates\", \"actual\": 2, \"expected\": 1, \"passed\": false}, {\"check\": \"Unicode case fold\", \"actual\": 2, \"expected\": 1, \"passed\": false}, {\"check\": \"punctuation matters\", \"actual\": 2, \"expected\": 2, \"passed\": true}, {\"check\": \"empty list\", \"actual\": 0, \"expected\": 0, \"passed\": true}, {\"check\": \"single value\", \"actual\": 1, \"expected\": 1, \"passed\": true}, {\"check\": \"distinct values\", \"actual\": 2, \"expected\": 2, \"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."}}