{"abstract":"Unknown complete lengths serialize as an asterisk.","category":"HTTP ranges","checks":6,"contract":"Serialize already valid bounds as bytes start-end/total; None total serializes as *. Zero is a known total in this formatting-only unit.","contract_signature":"start, end, total","evaluation_group":"s3-http_ranges-response-metadata","failed_approach":"The partial repair uses return f\"bytes {start}-{end}/{total or chr(42)}\", which still violates the stated contract.","family":"s3-http_ranges-content-range-unknown-total","id":"FA-26691","implementations":{"attempt":{"sha256":"90f3156e87bf2d66501b0caba36140c2d7a1ffd301bd408a73069c59a147f196","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(start, end, total):\n    return f\"bytes {start}-{end}/{total or chr(42)}\"\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('content-range-unknown-total fixture 0', solve(0,N,None), \"bytes 0-\"+str(N)+\"/*\")\ncheck('content-range-unknown-total fixture 1', solve(0,0,0), \"bytes 0-0/0\")\ncheck('content-range-unknown-total fixture 2', solve(0,N,N+1), \"bytes 0-\"+str(N)+\"/\"+str(N+1))\ncheck('content-range-unknown-total fixture 3', solve(1,2,3), \"bytes 1-2/3\")\ncheck('content-range-unknown-total fixture 4', solve(N,N,None), \"bytes \"+str(N)+\"-\"+str(N)+\"/*\")\ncheck('content-range-unknown-total fixture 5', solve(0,0,1), \"bytes 0-0/1\")\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":"065b2364a8d7bfb218b518c27616a3dc3eb7ccbd5c6c99ba2dc261259437d4fc","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(start, end, total):\n    return f\"bytes {start}-{end}/{total}\"\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('content-range-unknown-total fixture 0', solve(0,N,None), \"bytes 0-\"+str(N)+\"/*\")\ncheck('content-range-unknown-total fixture 1', solve(0,0,0), \"bytes 0-0/0\")\ncheck('content-range-unknown-total fixture 2', solve(0,N,N+1), \"bytes 0-\"+str(N)+\"/\"+str(N+1))\ncheck('content-range-unknown-total fixture 3', solve(1,2,3), \"bytes 1-2/3\")\ncheck('content-range-unknown-total fixture 4', solve(N,N,None), \"bytes \"+str(N)+\"-\"+str(N)+\"/*\")\ncheck('content-range-unknown-total fixture 5', solve(0,0,1), \"bytes 0-0/1\")\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-content-range-unknown-total","generated_at":"2026-09-29T14:41:18.198033+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 content-range-unknown-total decision uses return f\"bytes {start}-{end}/{total}\".","sha256":"a678406c95ec69312e19a71370dfe64fb2ae2707e33f203f5524d5f3e66f2773","title":"Unknown complete lengths serialize as an asterisk · 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":40.967,"exit_code":1,"observations":[{"actual":"bytes 0-1/*","check":"content-range-unknown-total fixture 0","expected":"bytes 0-1/*","passed":true},{"actual":"bytes 0-0/*","check":"content-range-unknown-total fixture 1","expected":"bytes 0-0/0","passed":false},{"actual":"bytes 0-1/2","check":"content-range-unknown-total fixture 2","expected":"bytes 0-1/2","passed":true},{"actual":"bytes 1-2/3","check":"content-range-unknown-total fixture 3","expected":"bytes 1-2/3","passed":true},{"actual":"bytes 1-1/*","check":"content-range-unknown-total fixture 4","expected":"bytes 1-1/*","passed":true},{"actual":"bytes 0-0/1","check":"content-range-unknown-total fixture 5","expected":"bytes 0-0/1","passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"content-range-unknown-total fixture 0\", \"actual\": \"bytes 0-1/*\", \"expected\": \"bytes 0-1/*\", \"passed\": true}, {\"check\": \"content-range-unknown-total fixture 1\", \"actual\": \"bytes 0-0/*\", \"expected\": \"bytes 0-0/0\", \"passed\": false}, {\"check\": \"content-range-unknown-total fixture 2\", \"actual\": \"bytes 0-1/2\", \"expected\": \"bytes 0-1/2\", \"passed\": true}, {\"check\": \"content-range-unknown-total fixture 3\", \"actual\": \"bytes 1-2/3\", \"expected\": \"bytes 1-2/3\", \"passed\": true}, {\"check\": \"content-range-unknown-total fixture 4\", \"actual\": \"bytes 1-1/*\", \"expected\": \"bytes 1-1/*\", \"passed\": true}, {\"check\": \"content-range-unknown-total fixture 5\", \"actual\": \"bytes 0-0/1\", \"expected\": \"bytes 0-0/1\", \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":41.151,"exit_code":1,"observations":[{"actual":"bytes 0-1/None","check":"content-range-unknown-total fixture 0","expected":"bytes 0-1/*","passed":false},{"actual":"bytes 0-0/0","check":"content-range-unknown-total fixture 1","expected":"bytes 0-0/0","passed":true},{"actual":"bytes 0-1/2","check":"content-range-unknown-total fixture 2","expected":"bytes 0-1/2","passed":true},{"actual":"bytes 1-2/3","check":"content-range-unknown-total fixture 3","expected":"bytes 1-2/3","passed":true},{"actual":"bytes 1-1/None","check":"content-range-unknown-total fixture 4","expected":"bytes 1-1/*","passed":false},{"actual":"bytes 0-0/1","check":"content-range-unknown-total fixture 5","expected":"bytes 0-0/1","passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"content-range-unknown-total fixture 0\", \"actual\": \"bytes 0-1/None\", \"expected\": \"bytes 0-1/*\", \"passed\": false}, {\"check\": \"content-range-unknown-total fixture 1\", \"actual\": \"bytes 0-0/0\", \"expected\": \"bytes 0-0/0\", \"passed\": true}, {\"check\": \"content-range-unknown-total fixture 2\", \"actual\": \"bytes 0-1/2\", \"expected\": \"bytes 0-1/2\", \"passed\": true}, {\"check\": \"content-range-unknown-total fixture 3\", \"actual\": \"bytes 1-2/3\", \"expected\": \"bytes 1-2/3\", \"passed\": true}, {\"check\": \"content-range-unknown-total fixture 4\", \"actual\": \"bytes 1-1/None\", \"expected\": \"bytes 1-1/*\", \"passed\": false}, {\"check\": \"content-range-unknown-total fixture 5\", \"actual\": \"bytes 0-0/1\", \"expected\": \"bytes 0-0/1\", \"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."}}