{"abstract":"A fresh full response replaces all stale sparse fragments.","category":"HTTP ranges","checks":6,"contract":"old maps absolute offsets to old chars. A completed full ASCII body atomically replaces the whole partial cache, including removal of bytes past new EOF.","evaluation_group":"s3-http_ranges-cache-assembly","failed_approach":"The partial repair uses return sorted(old.items()) if not full else list(enumerate(full)), which still violates the stated contract.","family":"s3-http_ranges-cache-full-response-replaces-fragments","id":"FA-26531","implementations":{"attempt":{"sha256":"722230a350dfd2129fd3420df90d2bec53224e3fe8fc1f5c7e99bd55261e3664","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(old, full):\n    return sorted(old.items()) if not full else list(enumerate(full))\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('cache-full-response-replaces-fragments fixture 0', solve( {0:\"x\",N+2:\"z\"},\"a\"*N), list(enumerate(\"a\"*N)))\ncheck('cache-full-response-replaces-fragments fixture 1', solve({0:\"x\"},\"\"), [])\ncheck('cache-full-response-replaces-fragments fixture 2', solve({},\"ab\"), [(0,\"a\"),(1,\"b\")])\ncheck('cache-full-response-replaces-fragments fixture 3', solve({0:\"x\"},\"a\"), [(0,\"a\")])\ncheck('cache-full-response-replaces-fragments fixture 4', solve({},\"\"), [])\ncheck('cache-full-response-replaces-fragments fixture 5', solve({1:\"b\"},\"xy\"), [(0,\"x\"),(1,\"y\")])\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":"db4d9416539ce59eb86485a6d1a3782a3b1f32a278b06b2d37655125590a89bd","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(old, full):\n    r=dict(old)\n    r.update(enumerate(full))\n    return sorted(r.items())\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('cache-full-response-replaces-fragments fixture 0', solve( {0:\"x\",N+2:\"z\"},\"a\"*N), list(enumerate(\"a\"*N)))\ncheck('cache-full-response-replaces-fragments fixture 1', solve({0:\"x\"},\"\"), [])\ncheck('cache-full-response-replaces-fragments fixture 2', solve({},\"ab\"), [(0,\"a\"),(1,\"b\")])\ncheck('cache-full-response-replaces-fragments fixture 3', solve({0:\"x\"},\"a\"), [(0,\"a\")])\ncheck('cache-full-response-replaces-fragments fixture 4', solve({},\"\"), [])\ncheck('cache-full-response-replaces-fragments fixture 5', solve({1:\"b\"},\"xy\"), [(0,\"x\"),(1,\"y\")])\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":"6bf39738141f0c8580d3d9d9d44c11eac8bf9f52e5c0fd2aa9503c64f7bec6ef","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(old, full):\n    return list(enumerate(full))\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('cache-full-response-replaces-fragments fixture 0', solve( {0:\"x\",N+2:\"z\"},\"a\"*N), list(enumerate(\"a\"*N)))\ncheck('cache-full-response-replaces-fragments fixture 1', solve({0:\"x\"},\"\"), [])\ncheck('cache-full-response-replaces-fragments fixture 2', solve({},\"ab\"), [(0,\"a\"),(1,\"b\")])\ncheck('cache-full-response-replaces-fragments fixture 3', solve({0:\"x\"},\"a\"), [(0,\"a\")])\ncheck('cache-full-response-replaces-fragments fixture 4', solve({},\"\"), [])\ncheck('cache-full-response-replaces-fragments fixture 5', solve({1:\"b\"},\"xy\"), [(0,\"x\"),(1,\"y\")])\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-full-response-replaces-fragments","generated_at":"2026-09-29T14:41:16.890708+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 list(enumerate(full))","root_cause":"The cache-full-response-replaces-fragments decision uses r=dict(old)\nr.update(enumerate(full))\nreturn sorted(r.items()).","sha256":"8278225e6d435bc609eaeee5149b686a29d36e9c385521f3211f97f4c276322d","title":"A fresh full response replaces all stale sparse fragments · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verification":{"attempt":{"elapsed_ms":39.229,"exit_code":1,"observations":[{"actual":[[0,"a"]],"check":"cache-full-response-replaces-fragments fixture 0","expected":[[0,"a"]],"passed":true},{"actual":[[0,"x"]],"check":"cache-full-response-replaces-fragments fixture 1","expected":[],"passed":false},{"actual":[[0,"a"],[1,"b"]],"check":"cache-full-response-replaces-fragments fixture 2","expected":[[0,"a"],[1,"b"]],"passed":true},{"actual":[[0,"a"]],"check":"cache-full-response-replaces-fragments fixture 3","expected":[[0,"a"]],"passed":true},{"actual":[],"check":"cache-full-response-replaces-fragments fixture 4","expected":[],"passed":true},{"actual":[[0,"x"],[1,"y"]],"check":"cache-full-response-replaces-fragments fixture 5","expected":[[0,"x"],[1,"y"]],"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"cache-full-response-replaces-fragments fixture 0\", \"actual\": [[0, \"a\"]], \"expected\": [[0, \"a\"]], \"passed\": true}, {\"check\": \"cache-full-response-replaces-fragments fixture 1\", \"actual\": [[0, \"x\"]], \"expected\": [], \"passed\": false}, {\"check\": \"cache-full-response-replaces-fragments fixture 2\", \"actual\": [[0, \"a\"], [1, \"b\"]], \"expected\": [[0, \"a\"], [1, \"b\"]], \"passed\": true}, {\"check\": \"cache-full-response-replaces-fragments fixture 3\", \"actual\": [[0, \"a\"]], \"expected\": [[0, \"a\"]], \"passed\": true}, {\"check\": \"cache-full-response-replaces-fragments fixture 4\", \"actual\": [], \"expected\": [], \"passed\": true}, {\"check\": \"cache-full-response-replaces-fragments fixture 5\", \"actual\": [[0, \"x\"], [1, \"y\"]], \"expected\": [[0, \"x\"], [1, \"y\"]], \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":39.804,"exit_code":1,"observations":[{"actual":[[0,"a"],[3,"z"]],"check":"cache-full-response-replaces-fragments fixture 0","expected":[[0,"a"]],"passed":false},{"actual":[[0,"x"]],"check":"cache-full-response-replaces-fragments fixture 1","expected":[],"passed":false},{"actual":[[0,"a"],[1,"b"]],"check":"cache-full-response-replaces-fragments fixture 2","expected":[[0,"a"],[1,"b"]],"passed":true},{"actual":[[0,"a"]],"check":"cache-full-response-replaces-fragments fixture 3","expected":[[0,"a"]],"passed":true},{"actual":[],"check":"cache-full-response-replaces-fragments fixture 4","expected":[],"passed":true},{"actual":[[0,"x"],[1,"y"]],"check":"cache-full-response-replaces-fragments fixture 5","expected":[[0,"x"],[1,"y"]],"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"cache-full-response-replaces-fragments fixture 0\", \"actual\": [[0, \"a\"], [3, \"z\"]], \"expected\": [[0, \"a\"]], \"passed\": false}, {\"check\": \"cache-full-response-replaces-fragments fixture 1\", \"actual\": [[0, \"x\"]], \"expected\": [], \"passed\": false}, {\"check\": \"cache-full-response-replaces-fragments fixture 2\", \"actual\": [[0, \"a\"], [1, \"b\"]], \"expected\": [[0, \"a\"], [1, \"b\"]], \"passed\": true}, {\"check\": \"cache-full-response-replaces-fragments fixture 3\", \"actual\": [[0, \"a\"]], \"expected\": [[0, \"a\"]], \"passed\": true}, {\"check\": \"cache-full-response-replaces-fragments fixture 4\", \"actual\": [], \"expected\": [], \"passed\": true}, {\"check\": \"cache-full-response-replaces-fragments fixture 5\", \"actual\": [[0, \"x\"], [1, \"y\"]], \"expected\": [[0, \"x\"], [1, \"y\"]], \"passed\": true}], \"passed\": false}\n"},"fixed":{"elapsed_ms":37.453,"exit_code":0,"observations":[{"actual":[[0,"a"]],"check":"cache-full-response-replaces-fragments fixture 0","expected":[[0,"a"]],"passed":true},{"actual":[],"check":"cache-full-response-replaces-fragments fixture 1","expected":[],"passed":true},{"actual":[[0,"a"],[1,"b"]],"check":"cache-full-response-replaces-fragments fixture 2","expected":[[0,"a"],[1,"b"]],"passed":true},{"actual":[[0,"a"]],"check":"cache-full-response-replaces-fragments fixture 3","expected":[[0,"a"]],"passed":true},{"actual":[],"check":"cache-full-response-replaces-fragments fixture 4","expected":[],"passed":true},{"actual":[[0,"x"],[1,"y"]],"check":"cache-full-response-replaces-fragments fixture 5","expected":[[0,"x"],[1,"y"]],"passed":true}],"passed":true,"stderr":"","stdout":"{\"observations\": [{\"check\": \"cache-full-response-replaces-fragments fixture 0\", \"actual\": [[0, \"a\"]], \"expected\": [[0, \"a\"]], \"passed\": true}, {\"check\": \"cache-full-response-replaces-fragments fixture 1\", \"actual\": [], \"expected\": [], \"passed\": true}, {\"check\": \"cache-full-response-replaces-fragments fixture 2\", \"actual\": [[0, \"a\"], [1, \"b\"]], \"expected\": [[0, \"a\"], [1, \"b\"]], \"passed\": true}, {\"check\": \"cache-full-response-replaces-fragments fixture 3\", \"actual\": [[0, \"a\"]], \"expected\": [[0, \"a\"]], \"passed\": true}, {\"check\": \"cache-full-response-replaces-fragments fixture 4\", \"actual\": [], \"expected\": [], \"passed\": true}, {\"check\": \"cache-full-response-replaces-fragments fixture 5\", \"actual\": [[0, \"x\"], [1, \"y\"]], \"expected\": [[0, \"x\"], [1, \"y\"]], \"passed\": true}], \"passed\": true}\n"}},"verified":true,"visibility":"public"}