{"abstract":"The reduction disagrees with its explicit aggregation oracle.","category":"Numerical aggregation","checks":6,"contract":"For lo<=hi, clip each integer contribution into [lo,hi], then sum. Empty is zero.","contract_signature":"xs, lo, hi","evaluation_group":"s3-na-clipped-contribution-sum","failed_approach":"Using the lower endpoint magnitude as both bounds also assumes symmetry.","family":"s3-numerical-aggregation-clipped-contribution-sum-cap-sign-reversal","id":"FA-12911","implementations":{"attempt":{"sha256":"f866995769e6c129a1f6c05eca9c978c11008c0fb80b518d538755b5bfb7bd30","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nfrom fractions import Fraction\nfrom collections import Counter, defaultdict\nimport math\nimport itertools\nN = 1\nobservations = []\ndef solve(xs, lo, hi):\n    return sum(max(lo,min(-lo,x)) for x in xs)\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('regression 1', solve(*([-9, 2, 8], 0, 5)), 7)\ncheck('regression 2', solve(*([], 1, 3)), 0)\ncheck('regression 3', solve(*([1, 2, 3], 0, 5)), 6)\ncheck('regression 4', solve(*([-4, -2], -3, -1)), -5)\ncheck('regression 5', solve(*([0, 0, 9], 2, 4)), 8)\ncheck(\"variable cap\", solve([0,N,N*4],1,N+1),2*N+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":"fb6c80cfa0abfe86a2580e21b6252752145bfac7a97954e7a5acaa1a386ef9d8","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nfrom fractions import Fraction\nfrom collections import Counter, defaultdict\nimport math\nimport itertools\nN = 1\nobservations = []\ndef solve(xs, lo, hi):\n    return sum(max(-hi,min(hi,x)) for x in xs)\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('regression 1', solve(*([-9, 2, 8], 0, 5)), 7)\ncheck('regression 2', solve(*([], 1, 3)), 0)\ncheck('regression 3', solve(*([1, 2, 3], 0, 5)), 6)\ncheck('regression 4', solve(*([-4, -2], -3, -1)), -5)\ncheck('regression 5', solve(*([0, 0, 9], 2, 4)), 8)\ncheck(\"variable cap\", solve([0,N,N*4],1,N+1),2*N+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":"Small offline integer/rational inputs only; no performance, statistical inference, or production-library conformance claim. 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":"s3-numerical-aggregation-clipped-contribution-sum-cap-sign-reversal","generated_at":"2026-09-29T14:39:01.597851+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"Exact bounded examples isolate a reduction defect without floating-point or external-service effects.","root_cause":"Symmetric magnitude clipping is used for asymmetric endpoints.","sha256":"81ca238df841bb701ae31d4c18a68040c286c3addbb88f63b83222de0ecb6494","title":"Clipped contribution sum: Symmetric magnitude clipping is used for asymmetric endpoints. · 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":45.95,"exit_code":1,"observations":[{"actual":0,"check":"regression 1","expected":7,"passed":false},{"actual":0,"check":"regression 2","expected":0,"passed":true},{"actual":0,"check":"regression 3","expected":6,"passed":false},{"actual":-5,"check":"regression 4","expected":-5,"passed":true},{"actual":6,"check":"regression 5","expected":8,"passed":false},{"actual":3,"check":"variable cap","expected":4,"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"regression 1\", \"actual\": 0, \"expected\": 7, \"passed\": false}, {\"check\": \"regression 2\", \"actual\": 0, \"expected\": 0, \"passed\": true}, {\"check\": \"regression 3\", \"actual\": 0, \"expected\": 6, \"passed\": false}, {\"check\": \"regression 4\", \"actual\": -5, \"expected\": -5, \"passed\": true}, {\"check\": \"regression 5\", \"actual\": 6, \"expected\": 8, \"passed\": false}, {\"check\": \"variable cap\", \"actual\": 3, \"expected\": 4, \"passed\": false}], \"passed\": false}\n"},"broken":{"elapsed_ms":45.38,"exit_code":1,"observations":[{"actual":2,"check":"regression 1","expected":7,"passed":false},{"actual":0,"check":"regression 2","expected":0,"passed":true},{"actual":6,"check":"regression 3","expected":6,"passed":true},{"actual":2,"check":"regression 4","expected":-5,"passed":false},{"actual":4,"check":"regression 5","expected":8,"passed":false},{"actual":3,"check":"variable cap","expected":4,"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"regression 1\", \"actual\": 2, \"expected\": 7, \"passed\": false}, {\"check\": \"regression 2\", \"actual\": 0, \"expected\": 0, \"passed\": true}, {\"check\": \"regression 3\", \"actual\": 6, \"expected\": 6, \"passed\": true}, {\"check\": \"regression 4\", \"actual\": 2, \"expected\": -5, \"passed\": false}, {\"check\": \"regression 5\", \"actual\": 4, \"expected\": 8, \"passed\": false}, {\"check\": \"variable cap\", \"actual\": 3, \"expected\": 4, \"passed\": false}], \"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."}}