{"abstract":"The operation returns a result or retained state that violates this contract: Return true for equal member sets regardless of counts and order.","category":"Collection algebra","checks":5,"contract":"Return true for equal member sets regardless of counts and order. Inputs are the finite Python values shown by the executable fixtures; no concurrent execution is assumed.","evaluation_group":"model-b3e0d44111a70769","failed_approach":"Sorting still retains multiplicity although the contract is set equality.","family":"xr-set-equality-ignores-counts","id":"FA-4326","implementations":{"attempt":{"sha256":"42ead49dd777a16a19f43b28da10c82d8fd83efb7409ce14956f172fea509b14","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(x, y=None):\n    return sorted(x)==sorted(y)\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('both empty', solve([], []), True)\ncheck('empty right operand', solve(['a'], []), False)\ncheck('empty left operand', solve([], ['b']), False)\ncheck('overlap and multiplicity', solve(['b', 'a', 'b'], ['b', 'c', 'c']), False)\ncheck('duplicate count ignored', solve(['a','a'], ['a']), True)\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":"c2689ca3ac2167c0b3894eba64f3250db6d939dbdcb5960a38d38d4e72fb8eba","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(x, y=None):\n    return x==y\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('both empty', solve([], []), True)\ncheck('empty right operand', solve(['a'], []), False)\ncheck('empty left operand', solve([], ['b']), False)\ncheck('overlap and multiplicity', solve(['b', 'a', 'b'], ['b', 'c', 'c']), False)\ncheck('duplicate count ignored', solve(['a','a'], ['a']), True)\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"},"fixed":{"sha256":"35904ea8ba6c208cfd43769b2199fe05940749236814fe7813abaaae6117c76f","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(x, y=None):\n    return set(x)==set(y)\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('both empty', solve([], []), True)\ncheck('empty right operand', solve(['a'], []), False)\ncheck('empty left operand', solve([], ['b']), False)\ncheck('overlap and multiplicity', solve(['b', 'a', 'b'], ['b', 'c', 'c']), False)\ncheck('duplicate count ignored', solve(['a','a'], ['a']), True)\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":"xr-set-equality-ignores-counts","generated_at":"2026-09-29T14:37:37.866698+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"A controlled local-runtime regression for collection APIs, language semantics, or ownership wrappers. Fixtures include boundary and interaction cases.","repair":"Return true for equal member sets regardless of counts and order.","root_cause":"Positional equality treats repeated occurrences and order as significant.","sha256":"66ebf5c08beca6cc8252667254272d7ae5f84514afdd4250625af8f9fe4c5c51","title":"Set equality ignores counts · case 01","variant":1,"variant_policy":"Five execution reruns of a fixed adversarial fixture suite; variant number does not alter semantic inputs.","verification":{"attempt":{"elapsed_ms":109.165,"exit_code":1,"observations":[{"actual":true,"check":"both empty","expected":true,"passed":true},{"actual":false,"check":"empty right operand","expected":false,"passed":true},{"actual":false,"check":"empty left operand","expected":false,"passed":true},{"actual":false,"check":"overlap and multiplicity","expected":false,"passed":true},{"actual":false,"check":"duplicate count ignored","expected":true,"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"both empty\", \"actual\": true, \"expected\": true, \"passed\": true}, {\"check\": \"empty right operand\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"empty left operand\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"overlap and multiplicity\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"duplicate count ignored\", \"actual\": false, \"expected\": true, \"passed\": false}], \"passed\": false}\n"},"broken":{"elapsed_ms":37.611,"exit_code":1,"observations":[{"actual":true,"check":"both empty","expected":true,"passed":true},{"actual":false,"check":"empty right operand","expected":false,"passed":true},{"actual":false,"check":"empty left operand","expected":false,"passed":true},{"actual":false,"check":"overlap and multiplicity","expected":false,"passed":true},{"actual":false,"check":"duplicate count ignored","expected":true,"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"both empty\", \"actual\": true, \"expected\": true, \"passed\": true}, {\"check\": \"empty right operand\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"empty left operand\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"overlap and multiplicity\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"duplicate count ignored\", \"actual\": false, \"expected\": true, \"passed\": false}], \"passed\": false}\n"},"fixed":{"elapsed_ms":40.311,"exit_code":0,"observations":[{"actual":true,"check":"both empty","expected":true,"passed":true},{"actual":false,"check":"empty right operand","expected":false,"passed":true},{"actual":false,"check":"empty left operand","expected":false,"passed":true},{"actual":false,"check":"overlap and multiplicity","expected":false,"passed":true},{"actual":true,"check":"duplicate count ignored","expected":true,"passed":true}],"passed":true,"stderr":"","stdout":"{\"observations\": [{\"check\": \"both empty\", \"actual\": true, \"expected\": true, \"passed\": true}, {\"check\": \"empty right operand\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"empty left operand\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"overlap and multiplicity\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"duplicate count ignored\", \"actual\": true, \"expected\": true, \"passed\": true}], \"passed\": true}\n"}},"verified":true,"visibility":"public"}