{"abstract":"A structured table violates the declared record or column contract.","category":"Delimited text","checks":11,"contract":"Read concatenated decimal-length:payload, cells, where length counts Unicode code points in this stipulated text format. Lengths are nonempty canonical ASCII decimal, including zero; payload may contain commas and colons. A terminal comma is mandatory after each payload. Return cells or null for malformed input.","evaluation_group":"s3-delimited-text-length-prefixed-cells","failed_approach":"The alternate implementation still violates the same declared invariant: a length-delimited payload includes the colon separator.","family":"s3-delimited-text-length-prefixed-cells-payload-origin","id":"FA-48246","implementations":{"attempt":{"sha256":"124f9cdcbde6bc0513b3bccc9a0bbdcb5f7a8bfca328868911f8c9eb19a1733b","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\ndef _vary(value):\n    if value == '@END': return 3 + 4*N\n    if isinstance(value, str): return value.replace('@', 'cell' * N)\n    if isinstance(value, list): return [_vary(x) for x in value]\n    if isinstance(value, dict): return {_vary(k): _vary(v) for k,v in value.items()}\n    return value\nN = 1\nobservations = []\ndef solve(data):\n    out=[]; pos=0\n    while pos<len(data):\n        colon=data.find(':',pos)\n        if colon<0: return None\n        token=data[pos:colon]\n        if not token.isascii() or not token.isdecimal() or token != str(int(token)): return None\n        size=int(token); begin=colon+2; end=begin+size\n        if end>=len(data) or data[end]!=',': return None\n        out.append(data[begin:end])\n        pos=end+1\n    return out\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('two', solve(_vary('1:a,3:x,y,')), _vary(['a', 'x,y']))\ncheck('colon payload', solve(_vary('3:a:b,')), _vary(['a:b']))\ncheck('zero', solve(_vary('0:,')), _vary(['']))\ncheck('unicode', solve(_vary('1:é,')), _vary(['é']))\ncheck('truncated', solve(_vary('4:ab,')), _vary(None))\ncheck('missing terminator', solve(_vary('1:a')), _vary(None))\ncheck('leading zero', solve(_vary('01:a,')), _vary(None))\ncheck('trailing junk', solve(_vary('1:a,x')), _vary(None))\ncheck('zero stream', solve(_vary('')), _vary([]))\ncheck('multi digit', solve(_vary('10:abcdefghij,')), _vary(['abcdefghij']))\ncheck('variant payload extent', solve(str(N)+':'+('x'*N)+','), ['x'*N])\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":"bdfdf102a103689e3f05ed3920b7ef81875f992499dcdf581860c4d9ffa40575","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\ndef _vary(value):\n    if value == '@END': return 3 + 4*N\n    if isinstance(value, str): return value.replace('@', 'cell' * N)\n    if isinstance(value, list): return [_vary(x) for x in value]\n    if isinstance(value, dict): return {_vary(k): _vary(v) for k,v in value.items()}\n    return value\nN = 1\nobservations = []\ndef solve(data):\n    out=[]; pos=0\n    while pos<len(data):\n        colon=data.find(':',pos)\n        if colon<0: return None\n        token=data[pos:colon]\n        if not token.isascii() or not token.isdecimal() or token != str(int(token)): return None\n        size=int(token); begin=colon; end=begin+size\n        if end>=len(data) or data[end]!=',': return None\n        out.append(data[begin:end])\n        pos=end+1\n    return out\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('two', solve(_vary('1:a,3:x,y,')), _vary(['a', 'x,y']))\ncheck('colon payload', solve(_vary('3:a:b,')), _vary(['a:b']))\ncheck('zero', solve(_vary('0:,')), _vary(['']))\ncheck('unicode', solve(_vary('1:é,')), _vary(['é']))\ncheck('truncated', solve(_vary('4:ab,')), _vary(None))\ncheck('missing terminator', solve(_vary('1:a')), _vary(None))\ncheck('leading zero', solve(_vary('01:a,')), _vary(None))\ncheck('trailing junk', solve(_vary('1:a,x')), _vary(None))\ncheck('zero stream', solve(_vary('')), _vary([]))\ncheck('multi digit', solve(_vary('10:abcdefghij,')), _vary(['abcdefghij']))\ncheck('variant payload extent', solve(str(N)+':'+('x'*N)+','), ['x'*N])\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"},"fixed":{"sha256":"2f57e6bd494ca1b250d6b6d2e5744b0558eba9494f414d49634b2a506cc65f0b","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\ndef _vary(value):\n    if value == '@END': return 3 + 4*N\n    if isinstance(value, str): return value.replace('@', 'cell' * N)\n    if isinstance(value, list): return [_vary(x) for x in value]\n    if isinstance(value, dict): return {_vary(k): _vary(v) for k,v in value.items()}\n    return value\nN = 1\nobservations = []\ndef solve(data):\n    out=[]; pos=0\n    while pos<len(data):\n        colon=data.find(':',pos)\n        if colon<0: return None\n        token=data[pos:colon]\n        if not token.isascii() or not token.isdecimal() or token != str(int(token)): return None\n        size=int(token); begin=colon+1; end=begin+size\n        if end>=len(data) or data[end]!=',': return None\n        out.append(data[begin:end])\n        pos=end+1\n    return out\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('two', solve(_vary('1:a,3:x,y,')), _vary(['a', 'x,y']))\ncheck('colon payload', solve(_vary('3:a:b,')), _vary(['a:b']))\ncheck('zero', solve(_vary('0:,')), _vary(['']))\ncheck('unicode', solve(_vary('1:é,')), _vary(['é']))\ncheck('truncated', solve(_vary('4:ab,')), _vary(None))\ncheck('missing terminator', solve(_vary('1:a')), _vary(None))\ncheck('leading zero', solve(_vary('01:a,')), _vary(None))\ncheck('trailing junk', solve(_vary('1:a,x')), _vary(None))\ncheck('zero stream', solve(_vary('')), _vary([]))\ncheck('multi digit', solve(_vary('10:abcdefghij,')), _vary(['abcdefghij']))\ncheck('variant payload extent', solve(str(N)+':'+('x'*N)+','), ['x'*N])\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 bounded in-memory model. No claim of complete CSV or external format conformance. 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-delimited-text-length-prefixed-cells-payload-origin","generated_at":"2026-09-29T14:44:48.953322+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"Delimited interchange needs explicit framing, schema and field semantics at ingestion and emission boundaries.","repair":"Preserve the named invariant at the faulty decision: begin=colon+1","root_cause":"A length-delimited payload includes the colon separator.","sha256":"66064d8e24e5de4ea128c8cf07b31cad5da9f25f0900c295b8febb317d6273ca","title":"A length-delimited payload includes the colon separator · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verification":{"attempt":{"elapsed_ms":39.999,"exit_code":1,"observations":[{"actual":null,"check":"two","expected":["a","x,y"],"passed":false},{"actual":null,"check":"colon payload","expected":["a:b"],"passed":false},{"actual":null,"check":"zero","expected":[""],"passed":false},{"actual":null,"check":"unicode","expected":["é"],"passed":false},{"actual":null,"check":"truncated","expected":null,"passed":true},{"actual":null,"check":"missing terminator","expected":null,"passed":true},{"actual":null,"check":"leading zero","expected":null,"passed":true},{"actual":null,"check":"trailing junk","expected":null,"passed":true},{"actual":[],"check":"zero stream","expected":[],"passed":true},{"actual":null,"check":"multi digit","expected":["abcdefghij"],"passed":false},{"actual":null,"check":"variant payload extent","expected":["x"],"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"two\", \"actual\": null, \"expected\": [\"a\", \"x,y\"], \"passed\": false}, {\"check\": \"colon payload\", \"actual\": null, \"expected\": [\"a:b\"], \"passed\": false}, {\"check\": \"zero\", \"actual\": null, \"expected\": [\"\"], \"passed\": false}, {\"check\": \"unicode\", \"actual\": null, \"expected\": [\"é\"], \"passed\": false}, {\"check\": \"truncated\", \"actual\": null, \"expected\": null, \"passed\": true}, {\"check\": \"missing terminator\", \"actual\": null, \"expected\": null, \"passed\": true}, {\"check\": \"leading zero\", \"actual\": null, \"expected\": null, \"passed\": true}, {\"check\": \"trailing junk\", \"actual\": null, \"expected\": null, \"passed\": true}, {\"check\": \"zero stream\", \"actual\": [], \"expected\": [], \"passed\": true}, {\"check\": \"multi digit\", \"actual\": null, \"expected\": [\"abcdefghij\"], \"passed\": false}, {\"check\": \"variant payload extent\", \"actual\": null, \"expected\": [\"x\"], \"passed\": false}], \"passed\": false}\n"},"broken":{"elapsed_ms":39.407,"exit_code":1,"observations":[{"actual":null,"check":"two","expected":["a","x,y"],"passed":false},{"actual":null,"check":"colon payload","expected":["a:b"],"passed":false},{"actual":null,"check":"zero","expected":[""],"passed":false},{"actual":null,"check":"unicode","expected":["é"],"passed":false},{"actual":null,"check":"truncated","expected":null,"passed":true},{"actual":null,"check":"missing terminator","expected":null,"passed":true},{"actual":null,"check":"leading zero","expected":null,"passed":true},{"actual":null,"check":"trailing junk","expected":null,"passed":true},{"actual":[],"check":"zero stream","expected":[],"passed":true},{"actual":null,"check":"multi digit","expected":["abcdefghij"],"passed":false},{"actual":null,"check":"variant payload extent","expected":["x"],"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"two\", \"actual\": null, \"expected\": [\"a\", \"x,y\"], \"passed\": false}, {\"check\": \"colon payload\", \"actual\": null, \"expected\": [\"a:b\"], \"passed\": false}, {\"check\": \"zero\", \"actual\": null, \"expected\": [\"\"], \"passed\": false}, {\"check\": \"unicode\", \"actual\": null, \"expected\": [\"é\"], \"passed\": false}, {\"check\": \"truncated\", \"actual\": null, \"expected\": null, \"passed\": true}, {\"check\": \"missing terminator\", \"actual\": null, \"expected\": null, \"passed\": true}, {\"check\": \"leading zero\", \"actual\": null, \"expected\": null, \"passed\": true}, {\"check\": \"trailing junk\", \"actual\": null, \"expected\": null, \"passed\": true}, {\"check\": \"zero stream\", \"actual\": [], \"expected\": [], \"passed\": true}, {\"check\": \"multi digit\", \"actual\": null, \"expected\": [\"abcdefghij\"], \"passed\": false}, {\"check\": \"variant payload extent\", \"actual\": null, \"expected\": [\"x\"], \"passed\": false}], \"passed\": false}\n"},"fixed":{"elapsed_ms":42.354,"exit_code":0,"observations":[{"actual":["a","x,y"],"check":"two","expected":["a","x,y"],"passed":true},{"actual":["a:b"],"check":"colon payload","expected":["a:b"],"passed":true},{"actual":[""],"check":"zero","expected":[""],"passed":true},{"actual":["é"],"check":"unicode","expected":["é"],"passed":true},{"actual":null,"check":"truncated","expected":null,"passed":true},{"actual":null,"check":"missing terminator","expected":null,"passed":true},{"actual":null,"check":"leading zero","expected":null,"passed":true},{"actual":null,"check":"trailing junk","expected":null,"passed":true},{"actual":[],"check":"zero stream","expected":[],"passed":true},{"actual":["abcdefghij"],"check":"multi digit","expected":["abcdefghij"],"passed":true},{"actual":["x"],"check":"variant payload extent","expected":["x"],"passed":true}],"passed":true,"stderr":"","stdout":"{\"observations\": [{\"check\": \"two\", \"actual\": [\"a\", \"x,y\"], \"expected\": [\"a\", \"x,y\"], \"passed\": true}, {\"check\": \"colon payload\", \"actual\": [\"a:b\"], \"expected\": [\"a:b\"], \"passed\": true}, {\"check\": \"zero\", \"actual\": [\"\"], \"expected\": [\"\"], \"passed\": true}, {\"check\": \"unicode\", \"actual\": [\"é\"], \"expected\": [\"é\"], \"passed\": true}, {\"check\": \"truncated\", \"actual\": null, \"expected\": null, \"passed\": true}, {\"check\": \"missing terminator\", \"actual\": null, \"expected\": null, \"passed\": true}, {\"check\": \"leading zero\", \"actual\": null, \"expected\": null, \"passed\": true}, {\"check\": \"trailing junk\", \"actual\": null, \"expected\": null, \"passed\": true}, {\"check\": \"zero stream\", \"actual\": [], \"expected\": [], \"passed\": true}, {\"check\": \"multi digit\", \"actual\": [\"abcdefghij\"], \"expected\": [\"abcdefghij\"], \"passed\": true}, {\"check\": \"variant payload extent\", \"actual\": [\"x\"], \"expected\": [\"x\"], \"passed\": true}], \"passed\": true}\n"}},"verified":true,"visibility":"public"}