{"abstract":"A form plus sign remains literal.","category":"Encodings","checks":4,"contract":"Decode form text: plus becomes space before percent-decoding UTF-8.","contract_signature":"x","evaluation_group":"model-1b98a42bc709de0f","failed_approach":"The attempted repair handles the primary example but still violates a separate boundary of the same contract.","family":"xp-form-plus-decoding","id":"FA-3276","implementations":{"attempt":{"sha256":"6156eb33b5aa984bf2ff0f79192e281eea03bcb98ef014695ac4ea9d0d9266b9","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 unquote(x).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%2Bb'), 'a+b')\ncheck('boundary 3', solve('%2520'), '%20')\ncheck('boundary 4', solve('caf%C3%A9'), 'café')\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":"b2c6cb6ae47ba6f4c91ff044e3f73df8e3e4e8e5f0bc28a856526f268f184175","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 unquote(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%2Bb'), 'a+b')\ncheck('boundary 3', solve('%2520'), '%20')\ncheck('boundary 4', solve('caf%C3%A9'), 'café')\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-form-plus-decoding","generated_at":"2026-09-29T14:37:23.530097+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 form text: plus becomes space before percent-decoding UTF-8.","sha256":"804e141a827b03c3d06fbb1ca3934c1ed1fed57c781407ae0af61355c040d79c","title":"A form plus sign remains literal · 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":51.488,"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":"%20","check":"boundary 3","expected":"%20","passed":true},{"actual":"café","check":"boundary 4","expected":"café","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\": \"%20\", \"expected\": \"%20\", \"passed\": true}, {\"check\": \"boundary 4\", \"actual\": \"café\", \"expected\": \"café\", \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":53.735,"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":"%20","check":"boundary 3","expected":"%20","passed":true},{"actual":"café","check":"boundary 4","expected":"café","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\": \"%20\", \"expected\": \"%20\", \"passed\": true}, {\"check\": \"boundary 4\", \"actual\": \"café\", \"expected\": \"café\", \"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."}}