{"abstract":"An unsatisfied continuation proves completion only against equal known total length.","category":"HTTP ranges","checks":6,"contract":"Return complete only if a known returned total exactly equals saved bytes; shorter or longer totals request restart; unknown totals remain unverified.","contract_signature":"saved_length, returned_total","evaluation_group":"s3-http_ranges-resume-client","failed_approach":"The partial repair uses return \"complete\" if returned_total is not None and saved_length>=returned_total else \"restart\", which still violates the stated contract.","family":"s3-http_ranges-resume-416-does-not-prove-completion","id":"FA-26756","implementations":{"attempt":{"sha256":"0556a2170fa247f6fb9254e0f675f4693bde6be8ce5ac8a447730e9f431bf56b","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(saved_length, returned_total):\n    return \"complete\" if returned_total is not None and saved_length>=returned_total else \"restart\"\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('resume-416-does-not-prove-completion fixture 0', solve(N,N+1), \"restart\")\ncheck('resume-416-does-not-prove-completion fixture 1', solve(N+1,N), \"restart\")\ncheck('resume-416-does-not-prove-completion fixture 2', solve(N,N), \"complete\")\ncheck('resume-416-does-not-prove-completion fixture 3', solve(N,None), \"unverified\")\ncheck('resume-416-does-not-prove-completion fixture 4', solve(0,0), \"complete\")\ncheck('resume-416-does-not-prove-completion fixture 5', solve(0,N), \"restart\")\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":"bf91d6eac55c9edbaf1bd96d94a4cc8e817a7b01a42f7f866a714526509174be","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(saved_length, returned_total):\n    return \"complete\"\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('resume-416-does-not-prove-completion fixture 0', solve(N,N+1), \"restart\")\ncheck('resume-416-does-not-prove-completion fixture 1', solve(N+1,N), \"restart\")\ncheck('resume-416-does-not-prove-completion fixture 2', solve(N,N), \"complete\")\ncheck('resume-416-does-not-prove-completion fixture 3', solve(N,None), \"unverified\")\ncheck('resume-416-does-not-prove-completion fixture 4', solve(0,0), \"complete\")\ncheck('resume-416-does-not-prove-completion fixture 5', solve(0,N), \"restart\")\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-resume-416-does-not-prove-completion","generated_at":"2026-09-29T14:41:18.789581+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 resume-416-does-not-prove-completion decision uses return \"complete\".","sha256":"324e748c9c04ddc0000bb69859717d1a82327a7ab134a19f363e88cfa7e7d92b","title":"An unsatisfied continuation proves completion only against equal known total length · 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":39.928,"exit_code":1,"observations":[{"actual":"restart","check":"resume-416-does-not-prove-completion fixture 0","expected":"restart","passed":true},{"actual":"complete","check":"resume-416-does-not-prove-completion fixture 1","expected":"restart","passed":false},{"actual":"complete","check":"resume-416-does-not-prove-completion fixture 2","expected":"complete","passed":true},{"actual":"restart","check":"resume-416-does-not-prove-completion fixture 3","expected":"unverified","passed":false},{"actual":"complete","check":"resume-416-does-not-prove-completion fixture 4","expected":"complete","passed":true},{"actual":"restart","check":"resume-416-does-not-prove-completion fixture 5","expected":"restart","passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"resume-416-does-not-prove-completion fixture 0\", \"actual\": \"restart\", \"expected\": \"restart\", \"passed\": true}, {\"check\": \"resume-416-does-not-prove-completion fixture 1\", \"actual\": \"complete\", \"expected\": \"restart\", \"passed\": false}, {\"check\": \"resume-416-does-not-prove-completion fixture 2\", \"actual\": \"complete\", \"expected\": \"complete\", \"passed\": true}, {\"check\": \"resume-416-does-not-prove-completion fixture 3\", \"actual\": \"restart\", \"expected\": \"unverified\", \"passed\": false}, {\"check\": \"resume-416-does-not-prove-completion fixture 4\", \"actual\": \"complete\", \"expected\": \"complete\", \"passed\": true}, {\"check\": \"resume-416-does-not-prove-completion fixture 5\", \"actual\": \"restart\", \"expected\": \"restart\", \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":38.85,"exit_code":1,"observations":[{"actual":"complete","check":"resume-416-does-not-prove-completion fixture 0","expected":"restart","passed":false},{"actual":"complete","check":"resume-416-does-not-prove-completion fixture 1","expected":"restart","passed":false},{"actual":"complete","check":"resume-416-does-not-prove-completion fixture 2","expected":"complete","passed":true},{"actual":"complete","check":"resume-416-does-not-prove-completion fixture 3","expected":"unverified","passed":false},{"actual":"complete","check":"resume-416-does-not-prove-completion fixture 4","expected":"complete","passed":true},{"actual":"complete","check":"resume-416-does-not-prove-completion fixture 5","expected":"restart","passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"resume-416-does-not-prove-completion fixture 0\", \"actual\": \"complete\", \"expected\": \"restart\", \"passed\": false}, {\"check\": \"resume-416-does-not-prove-completion fixture 1\", \"actual\": \"complete\", \"expected\": \"restart\", \"passed\": false}, {\"check\": \"resume-416-does-not-prove-completion fixture 2\", \"actual\": \"complete\", \"expected\": \"complete\", \"passed\": true}, {\"check\": \"resume-416-does-not-prove-completion fixture 3\", \"actual\": \"complete\", \"expected\": \"unverified\", \"passed\": false}, {\"check\": \"resume-416-does-not-prove-completion fixture 4\", \"actual\": \"complete\", \"expected\": \"complete\", \"passed\": true}, {\"check\": \"resume-416-does-not-prove-completion fixture 5\", \"actual\": \"complete\", \"expected\": \"restart\", \"passed\": false}], \"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."}}