{"abstract":"Every part uses the selected representation media type.","category":"HTTP ranges","checks":6,"contract":"Return one Content-Type value per part, preserving the full selected object type including parameters.","contract_signature":"object_type, count","evaluation_group":"s3-http_ranges-multipart","failed_approach":"The partial repair uses return [object_type.split(\";\")[0]]*count, which still violates the stated contract.","family":"s3-http_ranges-multipart-part-type-preserved","id":"FA-26461","implementations":{"attempt":{"sha256":"689ca49f2560d133d178c0f5533ee4239551da69b77b52c7631110edf7442a1e","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(object_type, count):\n    return [object_type.split(\";\")[0]]*count\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('multipart-part-type-preserved fixture 0', solve(\"text/plain; charset=utf-8\",N), [\"text/plain; charset=utf-8\"]*N)\ncheck('multipart-part-type-preserved fixture 1', solve(\"image/png\",2), [\"image/png\",\"image/png\"])\ncheck('multipart-part-type-preserved fixture 2', solve(\"text/plain\",0), [])\ncheck('multipart-part-type-preserved fixture 3', solve(\"application/x; a=b\",2), [\"application/x; a=b\"]*2)\ncheck('multipart-part-type-preserved fixture 4', solve(\"x/y\",1), [\"x/y\"])\ncheck('multipart-part-type-preserved fixture 5', solve(\"\",1), [\"\"])\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":"3331606780056ee632c836e49a31ad59db4588ef49ae7b4d2637c475aa3a4bb3","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(object_type, count):\n    return [\"multipart/byteranges\"]*count\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('multipart-part-type-preserved fixture 0', solve(\"text/plain; charset=utf-8\",N), [\"text/plain; charset=utf-8\"]*N)\ncheck('multipart-part-type-preserved fixture 1', solve(\"image/png\",2), [\"image/png\",\"image/png\"])\ncheck('multipart-part-type-preserved fixture 2', solve(\"text/plain\",0), [])\ncheck('multipart-part-type-preserved fixture 3', solve(\"application/x; a=b\",2), [\"application/x; a=b\"]*2)\ncheck('multipart-part-type-preserved fixture 4', solve(\"x/y\",1), [\"x/y\"])\ncheck('multipart-part-type-preserved fixture 5', solve(\"\",1), [\"\"])\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-multipart-part-type-preserved","generated_at":"2026-09-29T14:41:16.272339+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 multipart-part-type-preserved decision uses return [\"multipart/byteranges\"]*count.","sha256":"10d4982ded9fa731b0686b8b8f12d2b14d6f68434f5817e54370643ac9d51d50","title":"Every part uses the selected representation media type · 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":39.131,"exit_code":1,"observations":[{"actual":["text/plain"],"check":"multipart-part-type-preserved fixture 0","expected":["text/plain; charset=utf-8"],"passed":false},{"actual":["image/png","image/png"],"check":"multipart-part-type-preserved fixture 1","expected":["image/png","image/png"],"passed":true},{"actual":[],"check":"multipart-part-type-preserved fixture 2","expected":[],"passed":true},{"actual":["application/x","application/x"],"check":"multipart-part-type-preserved fixture 3","expected":["application/x; a=b","application/x; a=b"],"passed":false},{"actual":["x/y"],"check":"multipart-part-type-preserved fixture 4","expected":["x/y"],"passed":true},{"actual":[""],"check":"multipart-part-type-preserved fixture 5","expected":[""],"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"multipart-part-type-preserved fixture 0\", \"actual\": [\"text/plain\"], \"expected\": [\"text/plain; charset=utf-8\"], \"passed\": false}, {\"check\": \"multipart-part-type-preserved fixture 1\", \"actual\": [\"image/png\", \"image/png\"], \"expected\": [\"image/png\", \"image/png\"], \"passed\": true}, {\"check\": \"multipart-part-type-preserved fixture 2\", \"actual\": [], \"expected\": [], \"passed\": true}, {\"check\": \"multipart-part-type-preserved fixture 3\", \"actual\": [\"application/x\", \"application/x\"], \"expected\": [\"application/x; a=b\", \"application/x; a=b\"], \"passed\": false}, {\"check\": \"multipart-part-type-preserved fixture 4\", \"actual\": [\"x/y\"], \"expected\": [\"x/y\"], \"passed\": true}, {\"check\": \"multipart-part-type-preserved fixture 5\", \"actual\": [\"\"], \"expected\": [\"\"], \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":37.591,"exit_code":1,"observations":[{"actual":["multipart/byteranges"],"check":"multipart-part-type-preserved fixture 0","expected":["text/plain; charset=utf-8"],"passed":false},{"actual":["multipart/byteranges","multipart/byteranges"],"check":"multipart-part-type-preserved fixture 1","expected":["image/png","image/png"],"passed":false},{"actual":[],"check":"multipart-part-type-preserved fixture 2","expected":[],"passed":true},{"actual":["multipart/byteranges","multipart/byteranges"],"check":"multipart-part-type-preserved fixture 3","expected":["application/x; a=b","application/x; a=b"],"passed":false},{"actual":["multipart/byteranges"],"check":"multipart-part-type-preserved fixture 4","expected":["x/y"],"passed":false},{"actual":["multipart/byteranges"],"check":"multipart-part-type-preserved fixture 5","expected":[""],"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"multipart-part-type-preserved fixture 0\", \"actual\": [\"multipart/byteranges\"], \"expected\": [\"text/plain; charset=utf-8\"], \"passed\": false}, {\"check\": \"multipart-part-type-preserved fixture 1\", \"actual\": [\"multipart/byteranges\", \"multipart/byteranges\"], \"expected\": [\"image/png\", \"image/png\"], \"passed\": false}, {\"check\": \"multipart-part-type-preserved fixture 2\", \"actual\": [], \"expected\": [], \"passed\": true}, {\"check\": \"multipart-part-type-preserved fixture 3\", \"actual\": [\"multipart/byteranges\", \"multipart/byteranges\"], \"expected\": [\"application/x; a=b\", \"application/x; a=b\"], \"passed\": false}, {\"check\": \"multipart-part-type-preserved fixture 4\", \"actual\": [\"multipart/byteranges\"], \"expected\": [\"x/y\"], \"passed\": false}, {\"check\": \"multipart-part-type-preserved fixture 5\", \"actual\": [\"multipart/byteranges\"], \"expected\": [\"\"], \"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."}}