{"abstract":"A data value retains a structural slash.","category":"Encodings","checks":4,"contract":"Percent-encode a component using UTF-8 with no safe reserved characters.","contract_signature":"x","evaluation_group":"model-e5d423a8cc2c8ec4","failed_approach":"The attempted repair handles the primary example but still violates a separate boundary of the same contract.","family":"xp-percent-path-separator","id":"FA-3286","implementations":{"attempt":{"sha256":"6028f966ef345066ea0cfad9f967dfec4cfc9f7fd6ec62c679bfd01d0039eae6","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 quote(x,safe='/')\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%2Fb')\ncheck('boundary 2', solve('a b'), 'a%20b')\ncheck('boundary 3', solve('é'), '%C3%A9')\ncheck('boundary 4', solve('~'), '~')\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":"431266543dad8da7ec9941dcf2ffeb42ac50f2ef435e58c12b59d9b0dcfe733a","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 quote(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%2Fb')\ncheck('boundary 2', solve('a b'), 'a%20b')\ncheck('boundary 3', solve('é'), '%C3%A9')\ncheck('boundary 4', solve('~'), '~')\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-percent-path-separator","generated_at":"2026-09-29T14:37:23.632812+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: Percent-encode a component using UTF-8 with no safe reserved characters.","sha256":"ec813eba55784939ae85f1465d9490155749e597bc06d6282e8ef66200f46a1f","title":"A data value retains a structural slash · 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":55.008,"exit_code":1,"observations":[{"actual":"a/b","check":"boundary 1","expected":"a%2Fb","passed":false},{"actual":"a%20b","check":"boundary 2","expected":"a%20b","passed":true},{"actual":"%C3%A9","check":"boundary 3","expected":"%C3%A9","passed":true},{"actual":"~","check":"boundary 4","expected":"~","passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": \"a/b\", \"expected\": \"a%2Fb\", \"passed\": false}, {\"check\": \"boundary 2\", \"actual\": \"a%20b\", \"expected\": \"a%20b\", \"passed\": true}, {\"check\": \"boundary 3\", \"actual\": \"%C3%A9\", \"expected\": \"%C3%A9\", \"passed\": true}, {\"check\": \"boundary 4\", \"actual\": \"~\", \"expected\": \"~\", \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":49.047,"exit_code":1,"observations":[{"actual":"a/b","check":"boundary 1","expected":"a%2Fb","passed":false},{"actual":"a%20b","check":"boundary 2","expected":"a%20b","passed":true},{"actual":"%C3%A9","check":"boundary 3","expected":"%C3%A9","passed":true},{"actual":"~","check":"boundary 4","expected":"~","passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": \"a/b\", \"expected\": \"a%2Fb\", \"passed\": false}, {\"check\": \"boundary 2\", \"actual\": \"a%20b\", \"expected\": \"a%20b\", \"passed\": true}, {\"check\": \"boundary 3\", \"actual\": \"%C3%A9\", \"expected\": \"%C3%A9\", \"passed\": true}, {\"check\": \"boundary 4\", \"actual\": \"~\", \"expected\": \"~\", \"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."}}