{"abstract":"Successful entity preconditions suppress a stale secondary date condition.","category":"HTTP ranges","checks":6,"contract":"If tag condition is present, its result alone decides 412; otherwise the unmodified-date condition decides. Accepted output is [206,part].","contract_signature":"tag_present, tag_ok, date_ok, part","evaluation_group":"s3-http_ranges-conditional","failed_approach":"The partial repair uses return [206,part] if tag_ok else [412,\"\"], which still violates the stated contract.","family":"s3-http_ranges-if-match-suppresses-unmodified-date","id":"FA-26381","implementations":{"attempt":{"sha256":"5a3b3dfdd9898f3b664ec7418348718cd64b4ef8f1e54d55b1003ac86bb107b2","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(tag_present, tag_ok, date_ok, part):\n    return [206,part] if tag_ok else [412,\"\"]\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('if-match-suppresses-unmodified-date fixture 0', solve(True,True,False,\"p\"*N), [206,\"p\"*N])\ncheck('if-match-suppresses-unmodified-date fixture 1', solve(False,False,True,\"p\"*N), [206,\"p\"*N])\ncheck('if-match-suppresses-unmodified-date fixture 2', solve(True,False,True,\"p\"), [412,\"\"])\ncheck('if-match-suppresses-unmodified-date fixture 3', solve(False,True,False,\"p\"), [412,\"\"])\ncheck('if-match-suppresses-unmodified-date fixture 4', solve(True,True,True,\"p\"), [206,\"p\"])\ncheck('if-match-suppresses-unmodified-date fixture 5', solve(False,False,False,\"\"), [412,\"\"])\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":"1c85145dac0f0a110bd3ff21d5046e14713e38d0dc64d02cf5e242eed3dbe40c","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(tag_present, tag_ok, date_ok, part):\n    return [206,part] if tag_ok and date_ok else [412,\"\"]\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('if-match-suppresses-unmodified-date fixture 0', solve(True,True,False,\"p\"*N), [206,\"p\"*N])\ncheck('if-match-suppresses-unmodified-date fixture 1', solve(False,False,True,\"p\"*N), [206,\"p\"*N])\ncheck('if-match-suppresses-unmodified-date fixture 2', solve(True,False,True,\"p\"), [412,\"\"])\ncheck('if-match-suppresses-unmodified-date fixture 3', solve(False,True,False,\"p\"), [412,\"\"])\ncheck('if-match-suppresses-unmodified-date fixture 4', solve(True,True,True,\"p\"), [206,\"p\"])\ncheck('if-match-suppresses-unmodified-date fixture 5', solve(False,False,False,\"\"), [412,\"\"])\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":"Deterministic simplified range service, with stipulated local policies and already parsed trusted inputs; not a complete HTTP implementation. 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-http_ranges-if-match-suppresses-unmodified-date","generated_at":"2026-09-29T14:41:15.589128+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"Range responses combine representation identity, conditional requests, framing, and partial-object state.","root_cause":"The if-match-suppresses-unmodified-date decision uses return [206,part] if tag_ok and date_ok else [412,\"\"].","sha256":"d0056b472f1e008d8a85d3f0c012f5b3bd582bb87c1d0a35ea3e693867febded","title":"Successful entity preconditions suppress a stale secondary date condition · 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":38.85,"exit_code":1,"observations":[{"actual":[206,"p"],"check":"if-match-suppresses-unmodified-date fixture 0","expected":[206,"p"],"passed":true},{"actual":[412,""],"check":"if-match-suppresses-unmodified-date fixture 1","expected":[206,"p"],"passed":false},{"actual":[412,""],"check":"if-match-suppresses-unmodified-date fixture 2","expected":[412,""],"passed":true},{"actual":[206,"p"],"check":"if-match-suppresses-unmodified-date fixture 3","expected":[412,""],"passed":false},{"actual":[206,"p"],"check":"if-match-suppresses-unmodified-date fixture 4","expected":[206,"p"],"passed":true},{"actual":[412,""],"check":"if-match-suppresses-unmodified-date fixture 5","expected":[412,""],"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"if-match-suppresses-unmodified-date fixture 0\", \"actual\": [206, \"p\"], \"expected\": [206, \"p\"], \"passed\": true}, {\"check\": \"if-match-suppresses-unmodified-date fixture 1\", \"actual\": [412, \"\"], \"expected\": [206, \"p\"], \"passed\": false}, {\"check\": \"if-match-suppresses-unmodified-date fixture 2\", \"actual\": [412, \"\"], \"expected\": [412, \"\"], \"passed\": true}, {\"check\": \"if-match-suppresses-unmodified-date fixture 3\", \"actual\": [206, \"p\"], \"expected\": [412, \"\"], \"passed\": false}, {\"check\": \"if-match-suppresses-unmodified-date fixture 4\", \"actual\": [206, \"p\"], \"expected\": [206, \"p\"], \"passed\": true}, {\"check\": \"if-match-suppresses-unmodified-date fixture 5\", \"actual\": [412, \"\"], \"expected\": [412, \"\"], \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":36.905,"exit_code":1,"observations":[{"actual":[412,""],"check":"if-match-suppresses-unmodified-date fixture 0","expected":[206,"p"],"passed":false},{"actual":[412,""],"check":"if-match-suppresses-unmodified-date fixture 1","expected":[206,"p"],"passed":false},{"actual":[412,""],"check":"if-match-suppresses-unmodified-date fixture 2","expected":[412,""],"passed":true},{"actual":[412,""],"check":"if-match-suppresses-unmodified-date fixture 3","expected":[412,""],"passed":true},{"actual":[206,"p"],"check":"if-match-suppresses-unmodified-date fixture 4","expected":[206,"p"],"passed":true},{"actual":[412,""],"check":"if-match-suppresses-unmodified-date fixture 5","expected":[412,""],"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"if-match-suppresses-unmodified-date fixture 0\", \"actual\": [412, \"\"], \"expected\": [206, \"p\"], \"passed\": false}, {\"check\": \"if-match-suppresses-unmodified-date fixture 1\", \"actual\": [412, \"\"], \"expected\": [206, \"p\"], \"passed\": false}, {\"check\": \"if-match-suppresses-unmodified-date fixture 2\", \"actual\": [412, \"\"], \"expected\": [412, \"\"], \"passed\": true}, {\"check\": \"if-match-suppresses-unmodified-date fixture 3\", \"actual\": [412, \"\"], \"expected\": [412, \"\"], \"passed\": true}, {\"check\": \"if-match-suppresses-unmodified-date fixture 4\", \"actual\": [206, \"p\"], \"expected\": [206, \"p\"], \"passed\": true}, {\"check\": \"if-match-suppresses-unmodified-date fixture 5\", \"actual\": [412, \"\"], \"expected\": [412, \"\"], \"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."}}