{"abstract":"An unknown TLV tag shifts the next record boundary.","category":"Binary formats","checks":4,"contract":"Decode tag,length,value records, returning values for tag 1 and skipping unknown tags; malformed input returns None.","contract_signature":"x","evaluation_group":"model-0294ac529c48a018","failed_approach":"The attempted repair handles the primary example but still violates a separate boundary of the same contract.","family":"xp-binary-tlv-unknown","id":"FA-3701","implementations":{"attempt":{"sha256":"84ed006d5083b20a70c2119b74ddfa885b7fd5496af5c01869c91167c5fa081c","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nimport re, unicodedata, json, csv, io, html, base64, binascii, codecs, struct\nfrom urllib.parse import quote, unquote, unquote_to_bytes, urlencode, parse_qsl, urlsplit, urlunsplit\nfrom email.header import decode_header, make_header\nfrom email.utils import getaddresses\nfrom xml.etree import ElementTree as ET\nimport shlex, string, textwrap\n\nN = 1\nobservations = []\ndef solve(x):\n    try:\n        out=[]\n        i=0\n        while i<len(x):\n            if i+2>len(x): return None\n            t,n=x[i:i+2]\n            if i+2+n>len(x): return None\n            if t==1: out.append(x[i+2:i+2+n])\n            i+=3\n        return out\n    except Exception as exc:\n        return {\"error\": type(exc).__name__}\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('boundary 1', solve([2, 2, 8, 9, 1, 1, 7]), [[7]])\ncheck('boundary 2', solve([1, 0]), [[]])\ncheck('boundary 3', solve([1, 2, 9]), None)\ncheck('boundary 4', solve([]), [])\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":"8a129677f6a83c393c2c303d76a008ec5875d51bc3fa198cbf2305408218d078","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nimport re, unicodedata, json, csv, io, html, base64, binascii, codecs, struct\nfrom urllib.parse import quote, unquote, unquote_to_bytes, urlencode, parse_qsl, urlsplit, urlunsplit\nfrom email.header import decode_header, make_header\nfrom email.utils import getaddresses\nfrom xml.etree import ElementTree as ET\nimport shlex, string, textwrap\n\nN = 1\nobservations = []\ndef solve(x):\n    try:\n        return [x[i+2] for i in range(0,len(x)-2,3) if x[i]==1]\n    except Exception as exc:\n        return {\"error\": type(exc).__name__}\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('boundary 1', solve([2, 2, 8, 9, 1, 1, 7]), [[7]])\ncheck('boundary 2', solve([1, 0]), [[]])\ncheck('boundary 3', solve([1, 2, 9]), None)\ncheck('boundary 4', solve([]), [])\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":" 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":"xp-binary-tlv-unknown","generated_at":"2026-09-29T14:37:29.570534+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"A local executable model for consumers of structured text; oracle values are authored literals, not outputs copied from the repaired implementation.","root_cause":"The implementation applies an operation whose text or grammar semantics violate this contract: Decode tag,length,value records, returning values for tag 1 and skipping unknown tags; malformed input returns None.","sha256":"e89b9f9459a308f5d8a17c5710b4331878a2663d6d4e11228d0ce5cafde6a7a0","title":"An unknown TLV tag shifts the next record boundary · 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":51.671,"exit_code":1,"observations":[{"actual":null,"check":"boundary 1","expected":[[7]],"passed":false},{"actual":[[]],"check":"boundary 2","expected":[[]],"passed":true},{"actual":null,"check":"boundary 3","expected":null,"passed":true},{"actual":[],"check":"boundary 4","expected":[],"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": null, \"expected\": [[7]], \"passed\": false}, {\"check\": \"boundary 2\", \"actual\": [[]], \"expected\": [[]], \"passed\": true}, {\"check\": \"boundary 3\", \"actual\": null, \"expected\": null, \"passed\": true}, {\"check\": \"boundary 4\", \"actual\": [], \"expected\": [], \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":52.824,"exit_code":1,"observations":[{"actual":[],"check":"boundary 1","expected":[[7]],"passed":false},{"actual":[],"check":"boundary 2","expected":[[]],"passed":false},{"actual":[9],"check":"boundary 3","expected":null,"passed":false},{"actual":[],"check":"boundary 4","expected":[],"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": [], \"expected\": [[7]], \"passed\": false}, {\"check\": \"boundary 2\", \"actual\": [], \"expected\": [[]], \"passed\": false}, {\"check\": \"boundary 3\", \"actual\": [9], \"expected\": null, \"passed\": false}, {\"check\": \"boundary 4\", \"actual\": [], \"expected\": [], \"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."}}