{"abstract":"Protocol trimming erases significant Unicode whitespace.","category":"Text processing","checks":4,"contract":"Trim only ASCII space and horizontal tab from both ends.","evaluation_group":"model-f20bcd57a176a53a","failed_approach":"The attempted repair handles the primary example but still violates a separate boundary of the same contract.","family":"xp-strip-ascii-only","id":"FA-3051","implementations":{"attempt":{"sha256":"366084c7a907ae20e58482145b95879748854634f490e2f5260e79ddcd0554f1","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.strip(' ')\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('\\xa0a\\xa0'), '\\xa0a\\xa0')\ncheck('boundary 2', solve('\\ta\\t'), 'a')\ncheck('boundary 3', solve(' a '), 'a')\ncheck('boundary 4', solve('\\na\\n'), '\\na\\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":"895b45c904ada85f0bc35b5dd9c0b71f283f48650dc705460c69a90cfcff04de","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.strip()\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('\\xa0a\\xa0'), '\\xa0a\\xa0')\ncheck('boundary 2', solve('\\ta\\t'), 'a')\ncheck('boundary 3', solve(' a '), 'a')\ncheck('boundary 4', solve('\\na\\n'), '\\na\\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":"dc4ead590edfa2e97b4832f9e71e3021f80c1786266418733409c898664e1c4e","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.strip(' \\x09')\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('\\xa0a\\xa0'), '\\xa0a\\xa0')\ncheck('boundary 2', solve('\\ta\\t'), 'a')\ncheck('boundary 3', solve(' a '), 'a')\ncheck('boundary 4', solve('\\na\\n'), '\\na\\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":" 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-strip-ascii-only","generated_at":"2026-09-29T14:37:20.774726+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.","repair":"Implement the complete stated contract, including the boundary fixtures: Trim only ASCII space and horizontal tab from both ends.","root_cause":"The implementation applies an operation whose text or grammar semantics violate this contract: Trim only ASCII space and horizontal tab from both ends.","sha256":"4b7b2118ebece0271c9c02fb3e6c506195ec64ef6387ccc5ae40e4566ce4015f","title":"Protocol trimming erases significant Unicode whitespace · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verification":{"attempt":{"elapsed_ms":61.507,"exit_code":1,"observations":[{"actual":" a ","check":"boundary 1","expected":" a ","passed":true},{"actual":"\ta\t","check":"boundary 2","expected":"a","passed":false},{"actual":"a","check":"boundary 3","expected":"a","passed":true},{"actual":"\na\n","check":"boundary 4","expected":"\na\n","passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": \" a \", \"expected\": \" a \", \"passed\": true}, {\"check\": \"boundary 2\", \"actual\": \"\\ta\\t\", \"expected\": \"a\", \"passed\": false}, {\"check\": \"boundary 3\", \"actual\": \"a\", \"expected\": \"a\", \"passed\": true}, {\"check\": \"boundary 4\", \"actual\": \"\\na\\n\", \"expected\": \"\\na\\n\", \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":60.169,"exit_code":1,"observations":[{"actual":"a","check":"boundary 1","expected":" a ","passed":false},{"actual":"a","check":"boundary 2","expected":"a","passed":true},{"actual":"a","check":"boundary 3","expected":"a","passed":true},{"actual":"a","check":"boundary 4","expected":"\na\n","passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": \"a\", \"expected\": \" a \", \"passed\": false}, {\"check\": \"boundary 2\", \"actual\": \"a\", \"expected\": \"a\", \"passed\": true}, {\"check\": \"boundary 3\", \"actual\": \"a\", \"expected\": \"a\", \"passed\": true}, {\"check\": \"boundary 4\", \"actual\": \"a\", \"expected\": \"\\na\\n\", \"passed\": false}], \"passed\": false}\n"},"fixed":{"elapsed_ms":59.75,"exit_code":0,"observations":[{"actual":" a ","check":"boundary 1","expected":" a ","passed":true},{"actual":"a","check":"boundary 2","expected":"a","passed":true},{"actual":"a","check":"boundary 3","expected":"a","passed":true},{"actual":"\na\n","check":"boundary 4","expected":"\na\n","passed":true}],"passed":true,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": \" a \", \"expected\": \" a \", \"passed\": true}, {\"check\": \"boundary 2\", \"actual\": \"a\", \"expected\": \"a\", \"passed\": true}, {\"check\": \"boundary 3\", \"actual\": \"a\", \"expected\": \"a\", \"passed\": true}, {\"check\": \"boundary 4\", \"actual\": \"\\na\\n\", \"expected\": \"\\na\\n\", \"passed\": true}], \"passed\": true}\n"}},"verified":true,"visibility":"public"}