{"abstract":"Confirmed shorter complete representations truncate stale local suffix bytes.","category":"HTTP ranges","checks":6,"contract":"Return local prefix up to confirmed total; local buffers shorter than total remain as-is. This operation follows successful revision replacement.","contract_signature":"local, confirmed_total","evaluation_group":"s3-http_ranges-resume-client","failed_approach":"The partial repair uses return local[:confirmed_total] if confirmed_total else local, which still violates the stated contract.","family":"s3-http_ranges-resume-total-shrink-truncate","id":"FA-26781","implementations":{"attempt":{"sha256":"edeae6d606e478f7bea28d3333cb60974d24c3fb54d257af40e19fd5489930e8","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(local, confirmed_total):\n    return local[:confirmed_total] if confirmed_total else local\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('resume-total-shrink-truncate fixture 0', solve(\"abc\"*N,N), (\"abc\"*N)[:N])\ncheck('resume-total-shrink-truncate fixture 1', solve(\"abc\",0), \"\")\ncheck('resume-total-shrink-truncate fixture 2', solve(\"abc\",3), \"abc\")\ncheck('resume-total-shrink-truncate fixture 3', solve(\"abc\",5), \"abc\")\ncheck('resume-total-shrink-truncate fixture 4', solve(\"\",0), \"\")\ncheck('resume-total-shrink-truncate fixture 5', solve(\"abcd\",2), \"ab\")\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":"817b8de6200df918c6ff82e7f7bc1550a1e74a5f2a2f34b29acf86a2efbd17b0","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(local, confirmed_total):\n    return local\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('resume-total-shrink-truncate fixture 0', solve(\"abc\"*N,N), (\"abc\"*N)[:N])\ncheck('resume-total-shrink-truncate fixture 1', solve(\"abc\",0), \"\")\ncheck('resume-total-shrink-truncate fixture 2', solve(\"abc\",3), \"abc\")\ncheck('resume-total-shrink-truncate fixture 3', solve(\"abc\",5), \"abc\")\ncheck('resume-total-shrink-truncate fixture 4', solve(\"\",0), \"\")\ncheck('resume-total-shrink-truncate fixture 5', solve(\"abcd\",2), \"ab\")\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-total-shrink-truncate","generated_at":"2026-09-29T14:41:19.031412+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-total-shrink-truncate decision uses return local.","sha256":"b08ea8fca547c3fb897a07203a9a0d5491fb8002a27b3a2087af1d908eea40ed","title":"Confirmed shorter complete representations truncate stale local suffix bytes · 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":40.998,"exit_code":1,"observations":[{"actual":"a","check":"resume-total-shrink-truncate fixture 0","expected":"a","passed":true},{"actual":"abc","check":"resume-total-shrink-truncate fixture 1","expected":"","passed":false},{"actual":"abc","check":"resume-total-shrink-truncate fixture 2","expected":"abc","passed":true},{"actual":"abc","check":"resume-total-shrink-truncate fixture 3","expected":"abc","passed":true},{"actual":"","check":"resume-total-shrink-truncate fixture 4","expected":"","passed":true},{"actual":"ab","check":"resume-total-shrink-truncate fixture 5","expected":"ab","passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"resume-total-shrink-truncate fixture 0\", \"actual\": \"a\", \"expected\": \"a\", \"passed\": true}, {\"check\": \"resume-total-shrink-truncate fixture 1\", \"actual\": \"abc\", \"expected\": \"\", \"passed\": false}, {\"check\": \"resume-total-shrink-truncate fixture 2\", \"actual\": \"abc\", \"expected\": \"abc\", \"passed\": true}, {\"check\": \"resume-total-shrink-truncate fixture 3\", \"actual\": \"abc\", \"expected\": \"abc\", \"passed\": true}, {\"check\": \"resume-total-shrink-truncate fixture 4\", \"actual\": \"\", \"expected\": \"\", \"passed\": true}, {\"check\": \"resume-total-shrink-truncate fixture 5\", \"actual\": \"ab\", \"expected\": \"ab\", \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":37.242,"exit_code":1,"observations":[{"actual":"abc","check":"resume-total-shrink-truncate fixture 0","expected":"a","passed":false},{"actual":"abc","check":"resume-total-shrink-truncate fixture 1","expected":"","passed":false},{"actual":"abc","check":"resume-total-shrink-truncate fixture 2","expected":"abc","passed":true},{"actual":"abc","check":"resume-total-shrink-truncate fixture 3","expected":"abc","passed":true},{"actual":"","check":"resume-total-shrink-truncate fixture 4","expected":"","passed":true},{"actual":"abcd","check":"resume-total-shrink-truncate fixture 5","expected":"ab","passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"resume-total-shrink-truncate fixture 0\", \"actual\": \"abc\", \"expected\": \"a\", \"passed\": false}, {\"check\": \"resume-total-shrink-truncate fixture 1\", \"actual\": \"abc\", \"expected\": \"\", \"passed\": false}, {\"check\": \"resume-total-shrink-truncate fixture 2\", \"actual\": \"abc\", \"expected\": \"abc\", \"passed\": true}, {\"check\": \"resume-total-shrink-truncate fixture 3\", \"actual\": \"abc\", \"expected\": \"abc\", \"passed\": true}, {\"check\": \"resume-total-shrink-truncate fixture 4\", \"actual\": \"\", \"expected\": \"\", \"passed\": true}, {\"check\": \"resume-total-shrink-truncate fixture 5\", \"actual\": \"abcd\", \"expected\": \"ab\", \"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."}}