{"abstract":"Accept-Ranges reflects the chosen representation source capability.","category":"HTTP ranges","checks":6,"contract":"Local advertisement is bytes only when the selected source supports seek. A dynamic selection uses its own capability, not the static source capability.","contract_signature":"static_seekable, selected_dynamic, dynamic_seekable","evaluation_group":"s3-http_ranges-representation","failed_approach":"The partial repair uses return \"bytes\" if static_seekable or dynamic_seekable else \"none\", which still violates the stated contract.","family":"s3-http_ranges-range-unit-capability-advertisement","id":"FA-26416","implementations":{"attempt":{"sha256":"e3c4f03cded4b0f47d5a6f8fb6a273488cd9677f809b313e90571b0cee87fbb9","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(static_seekable, selected_dynamic, dynamic_seekable):\n    return \"bytes\" if static_seekable or dynamic_seekable else \"none\"\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('range-unit-capability-advertisement fixture 0', solve(True,True,False), \"none\")\ncheck('range-unit-capability-advertisement fixture 1', solve(False,False,True), \"none\")\ncheck('range-unit-capability-advertisement fixture 2', solve(False,True,True), \"bytes\")\ncheck('range-unit-capability-advertisement fixture 3', solve(True,False,False), \"bytes\")\ncheck('range-unit-capability-advertisement fixture 4', solve(False,True,False), \"none\")\ncheck('range-unit-capability-advertisement fixture 5', solve(True,True,True), \"bytes\")\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":"20a8755c51340cb2a9d3d38f574a070504f031f81f9d3f08cf0817b3265f201c","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(static_seekable, selected_dynamic, dynamic_seekable):\n    return \"bytes\" if static_seekable else \"none\"\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('range-unit-capability-advertisement fixture 0', solve(True,True,False), \"none\")\ncheck('range-unit-capability-advertisement fixture 1', solve(False,False,True), \"none\")\ncheck('range-unit-capability-advertisement fixture 2', solve(False,True,True), \"bytes\")\ncheck('range-unit-capability-advertisement fixture 3', solve(True,False,False), \"bytes\")\ncheck('range-unit-capability-advertisement fixture 4', solve(False,True,False), \"none\")\ncheck('range-unit-capability-advertisement fixture 5', solve(True,True,True), \"bytes\")\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-unit-capability-advertisement","generated_at":"2026-09-29T14:41:15.780019+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-unit-capability-advertisement decision uses return \"bytes\" if static_seekable else \"none\".","sha256":"247513918f2057768be272aaee1602cc030ded32977b0d5efe01a7a76d4d1f0f","title":"Accept-Ranges reflects the chosen representation source capability · 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":39.933,"exit_code":1,"observations":[{"actual":"bytes","check":"range-unit-capability-advertisement fixture 0","expected":"none","passed":false},{"actual":"bytes","check":"range-unit-capability-advertisement fixture 1","expected":"none","passed":false},{"actual":"bytes","check":"range-unit-capability-advertisement fixture 2","expected":"bytes","passed":true},{"actual":"bytes","check":"range-unit-capability-advertisement fixture 3","expected":"bytes","passed":true},{"actual":"none","check":"range-unit-capability-advertisement fixture 4","expected":"none","passed":true},{"actual":"bytes","check":"range-unit-capability-advertisement fixture 5","expected":"bytes","passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"range-unit-capability-advertisement fixture 0\", \"actual\": \"bytes\", \"expected\": \"none\", \"passed\": false}, {\"check\": \"range-unit-capability-advertisement fixture 1\", \"actual\": \"bytes\", \"expected\": \"none\", \"passed\": false}, {\"check\": \"range-unit-capability-advertisement fixture 2\", \"actual\": \"bytes\", \"expected\": \"bytes\", \"passed\": true}, {\"check\": \"range-unit-capability-advertisement fixture 3\", \"actual\": \"bytes\", \"expected\": \"bytes\", \"passed\": true}, {\"check\": \"range-unit-capability-advertisement fixture 4\", \"actual\": \"none\", \"expected\": \"none\", \"passed\": true}, {\"check\": \"range-unit-capability-advertisement fixture 5\", \"actual\": \"bytes\", \"expected\": \"bytes\", \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":40.794,"exit_code":1,"observations":[{"actual":"bytes","check":"range-unit-capability-advertisement fixture 0","expected":"none","passed":false},{"actual":"none","check":"range-unit-capability-advertisement fixture 1","expected":"none","passed":true},{"actual":"none","check":"range-unit-capability-advertisement fixture 2","expected":"bytes","passed":false},{"actual":"bytes","check":"range-unit-capability-advertisement fixture 3","expected":"bytes","passed":true},{"actual":"none","check":"range-unit-capability-advertisement fixture 4","expected":"none","passed":true},{"actual":"bytes","check":"range-unit-capability-advertisement fixture 5","expected":"bytes","passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"range-unit-capability-advertisement fixture 0\", \"actual\": \"bytes\", \"expected\": \"none\", \"passed\": false}, {\"check\": \"range-unit-capability-advertisement fixture 1\", \"actual\": \"none\", \"expected\": \"none\", \"passed\": true}, {\"check\": \"range-unit-capability-advertisement fixture 2\", \"actual\": \"none\", \"expected\": \"bytes\", \"passed\": false}, {\"check\": \"range-unit-capability-advertisement fixture 3\", \"actual\": \"bytes\", \"expected\": \"bytes\", \"passed\": true}, {\"check\": \"range-unit-capability-advertisement fixture 4\", \"actual\": \"none\", \"expected\": \"none\", \"passed\": true}, {\"check\": \"range-unit-capability-advertisement fixture 5\", \"actual\": \"bytes\", \"expected\": \"bytes\", \"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."}}