{"abstract":"CSV trimming changes a quoted cell value.","category":"Delimited text","checks":4,"contract":"Read a CSV row retaining leading spaces in unquoted fields and spaces inside quoted fields.","contract_signature":"x","evaluation_group":"model-e1a26fbbe097d69e","failed_approach":"The attempted repair handles the primary example but still violates a separate boundary of the same contract.","family":"xp-csv-whitespace-significant","id":"FA-3191","implementations":{"attempt":{"sha256":"1a681940bb85650fd589fcc5730c42cf12eeefd54dc256e034a4d28b0b6c6a9b","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 next(csv.reader([x],skipinitialspace=True))\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(' a,b'), [' a', 'b'])\ncheck('boundary 2', solve('\" a \",b'), [' a ', 'b'])\ncheck('boundary 3', solve('a, b'), ['a', ' b'])\ncheck('boundary 4', solve('a,b'), ['a', 'b'])\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":"e47dc600c24cbea15e1a21c58e8c85154ba2932661142e7702134eccfca82a49","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 [v.strip() for v in next(csv.reader([x]))]\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(' a,b'), [' a', 'b'])\ncheck('boundary 2', solve('\" a \",b'), [' a ', 'b'])\ncheck('boundary 3', solve('a, b'), ['a', ' b'])\ncheck('boundary 4', solve('a,b'), ['a', 'b'])\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-csv-whitespace-significant","generated_at":"2026-09-29T14:37:22.554845+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: Read a CSV row retaining leading spaces in unquoted fields and spaces inside quoted fields.","sha256":"53c670279da4492e210a579632a2c7119a4c5296cfaaf342d787ac7c4118fb42","title":"CSV trimming changes a quoted cell value · 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":55.031,"exit_code":1,"observations":[{"actual":["a","b"],"check":"boundary 1","expected":[" a","b"],"passed":false},{"actual":[" a ","b"],"check":"boundary 2","expected":[" a ","b"],"passed":true},{"actual":["a","b"],"check":"boundary 3","expected":["a"," b"],"passed":false},{"actual":["a","b"],"check":"boundary 4","expected":["a","b"],"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": [\"a\", \"b\"], \"expected\": [\" a\", \"b\"], \"passed\": false}, {\"check\": \"boundary 2\", \"actual\": [\" a \", \"b\"], \"expected\": [\" a \", \"b\"], \"passed\": true}, {\"check\": \"boundary 3\", \"actual\": [\"a\", \"b\"], \"expected\": [\"a\", \" b\"], \"passed\": false}, {\"check\": \"boundary 4\", \"actual\": [\"a\", \"b\"], \"expected\": [\"a\", \"b\"], \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":56.68,"exit_code":1,"observations":[{"actual":["a","b"],"check":"boundary 1","expected":[" a","b"],"passed":false},{"actual":["a","b"],"check":"boundary 2","expected":[" a ","b"],"passed":false},{"actual":["a","b"],"check":"boundary 3","expected":["a"," b"],"passed":false},{"actual":["a","b"],"check":"boundary 4","expected":["a","b"],"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": [\"a\", \"b\"], \"expected\": [\" a\", \"b\"], \"passed\": false}, {\"check\": \"boundary 2\", \"actual\": [\"a\", \"b\"], \"expected\": [\" a \", \"b\"], \"passed\": false}, {\"check\": \"boundary 3\", \"actual\": [\"a\", \"b\"], \"expected\": [\"a\", \" b\"], \"passed\": false}, {\"check\": \"boundary 4\", \"actual\": [\"a\", \"b\"], \"expected\": [\"a\", \"b\"], \"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."}}