{"abstract":"User-specific partial objects remain partitioned by principal.","category":"HTTP ranges","checks":6,"contract":"Return cache identity [url,validator,principal-or-null]; principal participates only for private responses, including empty principal.","evaluation_group":"s3-http_ranges-cache-assembly","failed_approach":"The partial repair uses return [url,validator,principal or None], which still violates the stated contract.","family":"s3-http_ranges-cache-private-partition","id":"FA-26521","implementations":{"attempt":{"sha256":"4b6e0a20c7c192cae2460c2d10b24cd07146eeeb81fbfa697a57bb0c9a6afb44","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(url, private, principal, validator):\n    return [url,validator,principal or None]\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('cache-private-partition fixture 0', solve(\"/x\",True,\"u\"+str(N),\"v\"), [\"/x\",\"v\",\"u\"+str(N)])\ncheck('cache-private-partition fixture 1', solve(\"/x\",True,\"\",\"v\"), [\"/x\",\"v\",\"\"])\ncheck('cache-private-partition fixture 2', solve(\"/x\",False,\"u\",\"v\"), [\"/x\",\"v\",None])\ncheck('cache-private-partition fixture 3', solve(\"/y\",False,\"\",\"w\"), [\"/y\",\"w\",None])\ncheck('cache-private-partition fixture 4', solve(\"/x\",True,\"a\",\"w\"), [\"/x\",\"w\",\"a\"])\ncheck('cache-private-partition fixture 5', solve(\"/x\",True,\"b\",\"w\"), [\"/x\",\"w\",\"b\"])\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":"7beedb5e944bc0c6a46ebe1dbced75220840475c8c044b19837197b5454dcabb","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(url, private, principal, validator):\n    return [url,validator,None]\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('cache-private-partition fixture 0', solve(\"/x\",True,\"u\"+str(N),\"v\"), [\"/x\",\"v\",\"u\"+str(N)])\ncheck('cache-private-partition fixture 1', solve(\"/x\",True,\"\",\"v\"), [\"/x\",\"v\",\"\"])\ncheck('cache-private-partition fixture 2', solve(\"/x\",False,\"u\",\"v\"), [\"/x\",\"v\",None])\ncheck('cache-private-partition fixture 3', solve(\"/y\",False,\"\",\"w\"), [\"/y\",\"w\",None])\ncheck('cache-private-partition fixture 4', solve(\"/x\",True,\"a\",\"w\"), [\"/x\",\"w\",\"a\"])\ncheck('cache-private-partition fixture 5', solve(\"/x\",True,\"b\",\"w\"), [\"/x\",\"w\",\"b\"])\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":"432a497c47cf0a9882ae1a84d672f44494c8b0a45d28434ca39769b20f079042","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(url, private, principal, validator):\n    return [url,validator,principal if private else None]\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('cache-private-partition fixture 0', solve(\"/x\",True,\"u\"+str(N),\"v\"), [\"/x\",\"v\",\"u\"+str(N)])\ncheck('cache-private-partition fixture 1', solve(\"/x\",True,\"\",\"v\"), [\"/x\",\"v\",\"\"])\ncheck('cache-private-partition fixture 2', solve(\"/x\",False,\"u\",\"v\"), [\"/x\",\"v\",None])\ncheck('cache-private-partition fixture 3', solve(\"/y\",False,\"\",\"w\"), [\"/y\",\"w\",None])\ncheck('cache-private-partition fixture 4', solve(\"/x\",True,\"a\",\"w\"), [\"/x\",\"w\",\"a\"])\ncheck('cache-private-partition fixture 5', solve(\"/x\",True,\"b\",\"w\"), [\"/x\",\"w\",\"b\"])\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-cache-private-partition","generated_at":"2026-09-29T14:41:16.816019+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.","repair":"Apply the bounded decision exactly: return [url,validator,principal if private else None]","root_cause":"The cache-private-partition decision uses return [url,validator,None].","sha256":"d00b7e478ebd5c99140451515f1254925b64a4cf3037f21cf49a884951d55173","title":"User-specific partial objects remain partitioned by principal · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verification":{"attempt":{"elapsed_ms":41.048,"exit_code":1,"observations":[{"actual":["/x","v","u1"],"check":"cache-private-partition fixture 0","expected":["/x","v","u1"],"passed":true},{"actual":["/x","v",null],"check":"cache-private-partition fixture 1","expected":["/x","v",""],"passed":false},{"actual":["/x","v","u"],"check":"cache-private-partition fixture 2","expected":["/x","v",null],"passed":false},{"actual":["/y","w",null],"check":"cache-private-partition fixture 3","expected":["/y","w",null],"passed":true},{"actual":["/x","w","a"],"check":"cache-private-partition fixture 4","expected":["/x","w","a"],"passed":true},{"actual":["/x","w","b"],"check":"cache-private-partition fixture 5","expected":["/x","w","b"],"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"cache-private-partition fixture 0\", \"actual\": [\"/x\", \"v\", \"u1\"], \"expected\": [\"/x\", \"v\", \"u1\"], \"passed\": true}, {\"check\": \"cache-private-partition fixture 1\", \"actual\": [\"/x\", \"v\", null], \"expected\": [\"/x\", \"v\", \"\"], \"passed\": false}, {\"check\": \"cache-private-partition fixture 2\", \"actual\": [\"/x\", \"v\", \"u\"], \"expected\": [\"/x\", \"v\", null], \"passed\": false}, {\"check\": \"cache-private-partition fixture 3\", \"actual\": [\"/y\", \"w\", null], \"expected\": [\"/y\", \"w\", null], \"passed\": true}, {\"check\": \"cache-private-partition fixture 4\", \"actual\": [\"/x\", \"w\", \"a\"], \"expected\": [\"/x\", \"w\", \"a\"], \"passed\": true}, {\"check\": \"cache-private-partition fixture 5\", \"actual\": [\"/x\", \"w\", \"b\"], \"expected\": [\"/x\", \"w\", \"b\"], \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":38.164,"exit_code":1,"observations":[{"actual":["/x","v",null],"check":"cache-private-partition fixture 0","expected":["/x","v","u1"],"passed":false},{"actual":["/x","v",null],"check":"cache-private-partition fixture 1","expected":["/x","v",""],"passed":false},{"actual":["/x","v",null],"check":"cache-private-partition fixture 2","expected":["/x","v",null],"passed":true},{"actual":["/y","w",null],"check":"cache-private-partition fixture 3","expected":["/y","w",null],"passed":true},{"actual":["/x","w",null],"check":"cache-private-partition fixture 4","expected":["/x","w","a"],"passed":false},{"actual":["/x","w",null],"check":"cache-private-partition fixture 5","expected":["/x","w","b"],"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"cache-private-partition fixture 0\", \"actual\": [\"/x\", \"v\", null], \"expected\": [\"/x\", \"v\", \"u1\"], \"passed\": false}, {\"check\": \"cache-private-partition fixture 1\", \"actual\": [\"/x\", \"v\", null], \"expected\": [\"/x\", \"v\", \"\"], \"passed\": false}, {\"check\": \"cache-private-partition fixture 2\", \"actual\": [\"/x\", \"v\", null], \"expected\": [\"/x\", \"v\", null], \"passed\": true}, {\"check\": \"cache-private-partition fixture 3\", \"actual\": [\"/y\", \"w\", null], \"expected\": [\"/y\", \"w\", null], \"passed\": true}, {\"check\": \"cache-private-partition fixture 4\", \"actual\": [\"/x\", \"w\", null], \"expected\": [\"/x\", \"w\", \"a\"], \"passed\": false}, {\"check\": \"cache-private-partition fixture 5\", \"actual\": [\"/x\", \"w\", null], \"expected\": [\"/x\", \"w\", \"b\"], \"passed\": false}], \"passed\": false}\n"},"fixed":{"elapsed_ms":38.416,"exit_code":0,"observations":[{"actual":["/x","v","u1"],"check":"cache-private-partition fixture 0","expected":["/x","v","u1"],"passed":true},{"actual":["/x","v",""],"check":"cache-private-partition fixture 1","expected":["/x","v",""],"passed":true},{"actual":["/x","v",null],"check":"cache-private-partition fixture 2","expected":["/x","v",null],"passed":true},{"actual":["/y","w",null],"check":"cache-private-partition fixture 3","expected":["/y","w",null],"passed":true},{"actual":["/x","w","a"],"check":"cache-private-partition fixture 4","expected":["/x","w","a"],"passed":true},{"actual":["/x","w","b"],"check":"cache-private-partition fixture 5","expected":["/x","w","b"],"passed":true}],"passed":true,"stderr":"","stdout":"{\"observations\": [{\"check\": \"cache-private-partition fixture 0\", \"actual\": [\"/x\", \"v\", \"u1\"], \"expected\": [\"/x\", \"v\", \"u1\"], \"passed\": true}, {\"check\": \"cache-private-partition fixture 1\", \"actual\": [\"/x\", \"v\", \"\"], \"expected\": [\"/x\", \"v\", \"\"], \"passed\": true}, {\"check\": \"cache-private-partition fixture 2\", \"actual\": [\"/x\", \"v\", null], \"expected\": [\"/x\", \"v\", null], \"passed\": true}, {\"check\": \"cache-private-partition fixture 3\", \"actual\": [\"/y\", \"w\", null], \"expected\": [\"/y\", \"w\", null], \"passed\": true}, {\"check\": \"cache-private-partition fixture 4\", \"actual\": [\"/x\", \"w\", \"a\"], \"expected\": [\"/x\", \"w\", \"a\"], \"passed\": true}, {\"check\": \"cache-private-partition fixture 5\", \"actual\": [\"/x\", \"w\", \"b\"], \"expected\": [\"/x\", \"w\", \"b\"], \"passed\": true}], \"passed\": true}\n"}},"verified":true,"visibility":"public"}