{"abstract":"A response digest describes the transferred slice instead of the whole object.","category":"HTTP ranges","checks":6,"contract":"Select part_digest for partial responses; no fallback to full digest when part digest unavailable (None).","contract_signature":"full_digest, part_digest, partial","evaluation_group":"s3-http_ranges-response-metadata","failed_approach":"The partial repair uses return (part_digest or full_digest) if partial else full_digest, which still violates the stated contract.","family":"s3-http_ranges-range-response-digest-selected-body","id":"FA-26731","implementations":{"attempt":{"sha256":"49e90c7ff541360d6d8031528fc2bd85e3f414ba33c055291db8f0bc861bfff0","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(full_digest, part_digest, partial):\n    return (part_digest or full_digest) if partial else full_digest\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('range-response-digest-selected-body fixture 0', solve(\"full\"+str(N),\"part\"+str(N),True), \"part\"+str(N))\ncheck('range-response-digest-selected-body fixture 1', solve(\"full\",None,True), None)\ncheck('range-response-digest-selected-body fixture 2', solve(\"full\",\"part\",False), \"full\")\ncheck('range-response-digest-selected-body fixture 3', solve(None,\"part\",False), None)\ncheck('range-response-digest-selected-body fixture 4', solve(\"full\",\"\",True), \"\")\ncheck('range-response-digest-selected-body fixture 5', solve(None,None,True), None)\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":"c2349ac48569280e5f6e876fe07d2758e40c1d03f5f7bc5ad62881dc1283cfa1","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(full_digest, part_digest, partial):\n    return full_digest\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('range-response-digest-selected-body fixture 0', solve(\"full\"+str(N),\"part\"+str(N),True), \"part\"+str(N))\ncheck('range-response-digest-selected-body fixture 1', solve(\"full\",None,True), None)\ncheck('range-response-digest-selected-body fixture 2', solve(\"full\",\"part\",False), \"full\")\ncheck('range-response-digest-selected-body fixture 3', solve(None,\"part\",False), None)\ncheck('range-response-digest-selected-body fixture 4', solve(\"full\",\"\",True), \"\")\ncheck('range-response-digest-selected-body fixture 5', solve(None,None,True), None)\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-range-response-digest-selected-body","generated_at":"2026-09-29T14:41:18.695349+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 range-response-digest-selected-body decision uses return full_digest.","sha256":"f6cb94a232fdf0277b6778d6fca7184c8e9a46da301c276f29ba83d3dda056f0","title":"A response digest describes the transferred slice instead of the whole object · 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":40.704,"exit_code":1,"observations":[{"actual":"part1","check":"range-response-digest-selected-body fixture 0","expected":"part1","passed":true},{"actual":"full","check":"range-response-digest-selected-body fixture 1","expected":null,"passed":false},{"actual":"full","check":"range-response-digest-selected-body fixture 2","expected":"full","passed":true},{"actual":null,"check":"range-response-digest-selected-body fixture 3","expected":null,"passed":true},{"actual":"full","check":"range-response-digest-selected-body fixture 4","expected":"","passed":false},{"actual":null,"check":"range-response-digest-selected-body fixture 5","expected":null,"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"range-response-digest-selected-body fixture 0\", \"actual\": \"part1\", \"expected\": \"part1\", \"passed\": true}, {\"check\": \"range-response-digest-selected-body fixture 1\", \"actual\": \"full\", \"expected\": null, \"passed\": false}, {\"check\": \"range-response-digest-selected-body fixture 2\", \"actual\": \"full\", \"expected\": \"full\", \"passed\": true}, {\"check\": \"range-response-digest-selected-body fixture 3\", \"actual\": null, \"expected\": null, \"passed\": true}, {\"check\": \"range-response-digest-selected-body fixture 4\", \"actual\": \"full\", \"expected\": \"\", \"passed\": false}, {\"check\": \"range-response-digest-selected-body fixture 5\", \"actual\": null, \"expected\": null, \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":38.876,"exit_code":1,"observations":[{"actual":"full1","check":"range-response-digest-selected-body fixture 0","expected":"part1","passed":false},{"actual":"full","check":"range-response-digest-selected-body fixture 1","expected":null,"passed":false},{"actual":"full","check":"range-response-digest-selected-body fixture 2","expected":"full","passed":true},{"actual":null,"check":"range-response-digest-selected-body fixture 3","expected":null,"passed":true},{"actual":"full","check":"range-response-digest-selected-body fixture 4","expected":"","passed":false},{"actual":null,"check":"range-response-digest-selected-body fixture 5","expected":null,"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"range-response-digest-selected-body fixture 0\", \"actual\": \"full1\", \"expected\": \"part1\", \"passed\": false}, {\"check\": \"range-response-digest-selected-body fixture 1\", \"actual\": \"full\", \"expected\": null, \"passed\": false}, {\"check\": \"range-response-digest-selected-body fixture 2\", \"actual\": \"full\", \"expected\": \"full\", \"passed\": true}, {\"check\": \"range-response-digest-selected-body fixture 3\", \"actual\": null, \"expected\": null, \"passed\": true}, {\"check\": \"range-response-digest-selected-body fixture 4\", \"actual\": \"full\", \"expected\": \"\", \"passed\": false}, {\"check\": \"range-response-digest-selected-body fixture 5\", \"actual\": null, \"expected\": null, \"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."}}