{"abstract":"Encoded-word underscores remain underscores.","category":"Encodings","checks":4,"contract":"Decode quoted-printable header text, treating underscore as space.","contract_signature":"x","evaluation_group":"model-4ff0186f3421c1a6","failed_approach":"The attempted repair handles the primary example but still violates a separate boundary of the same contract.","family":"xp-quoted-printable-header","id":"FA-3341","implementations":{"attempt":{"sha256":"d3b801f68d46e6f63768499f332284c952cd9b720aeb354ed6d81ad2339070ac","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 binascii.a2b_qp(x).decode('latin1').replace('_',' ')\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=5Fb'), 'a_b')\ncheck('boundary 3', solve('=E9'), 'é')\ncheck('boundary 4', solve('x'), 'x')\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":"02f4ef558e9c7ebac5c60dc80f9084011458865eea3dd2c02a4087a154b71762","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 binascii.a2b_qp(x).decode('latin1')\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=5Fb'), 'a_b')\ncheck('boundary 3', solve('=E9'), 'é')\ncheck('boundary 4', solve('x'), 'x')\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-quoted-printable-header","generated_at":"2026-09-29T14:37:24.451995+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 quoted-printable header text, treating underscore as space.","sha256":"fda2cc1f8e3c4f1de3668b877c33310d61c9ecad8a37b153391d032495fc4526","title":"Encoded-word underscores remain underscores · 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":57.523,"exit_code":1,"observations":[{"actual":"a b","check":"boundary 1","expected":"a b","passed":true},{"actual":"a b","check":"boundary 2","expected":"a_b","passed":false},{"actual":"é","check":"boundary 3","expected":"é","passed":true},{"actual":"x","check":"boundary 4","expected":"x","passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": \"a b\", \"expected\": \"a b\", \"passed\": true}, {\"check\": \"boundary 2\", \"actual\": \"a b\", \"expected\": \"a_b\", \"passed\": false}, {\"check\": \"boundary 3\", \"actual\": \"é\", \"expected\": \"é\", \"passed\": true}, {\"check\": \"boundary 4\", \"actual\": \"x\", \"expected\": \"x\", \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":49.152,"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":"é","check":"boundary 3","expected":"é","passed":true},{"actual":"x","check":"boundary 4","expected":"x","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\": \"é\", \"expected\": \"é\", \"passed\": true}, {\"check\": \"boundary 4\", \"actual\": \"x\", \"expected\": \"x\", \"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."}}