{"abstract":"Merchant parking validations returns a wrong result when only the largest flat validation applies.","category":"Toll and parking fee computation","checks":8,"contract":"Input {minutes (single day), validations: [[free_min|pct|flat, value]], hourly, daily_max, max_free_min}. Free minutes from all validations are summed, capped at max_free_min and deducted from the stay before rating. The fee is started hours * hourly capped at daily_max. Only the largest percentage validation applies (discount floored to cents), then all flat validations are subtracted, never below zero.","contract_signature":"x","evaluation_group":"w2-toll_and_parking_fee_computation-merchant-validation","failed_approach":"Refusing flat validations when a percentage applies is a combinability rule the contract does not have.","family":"w2-toll_and_parking_fee_computation-merchant-validation-flat-sum","id":"FA-68686","implementations":{"attempt":{"sha256":"28560fad134de5fd0ee6f0916a80245c2ff72c299b6a0ac42de385f6df4efe14","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(x):\n    free = min(x['max_free_min'], sum(v for k, v in x['validations'] if k == 'free_min'))\n    bill = max(0, x['minutes'] - free)\n    fee = min(x['daily_max'], -(-bill // 60) * x['hourly'])\n    pcts = [v for k, v in x['validations'] if k == 'pct']\n    if pcts:\n        fee -= fee * max(pcts) // 100\n    flat = sum(v for k, v in x['validations'] if k == 'flat') if not pcts else 0\n    return max(0, fee - flat)\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = [[({'minutes': 552, 'validations': [['flat', 250], ['flat', 500], ['free_min', 15], ['free_min', 15]], 'hourly': 350, 'daily_max': 3000, 'max_free_min': 120}, 2250), ({'minutes': 839, 'validations': [['flat', 250], ['free_min', 60], ['flat', 500]], 'hourly': 200, 'daily_max': 1800, 'max_free_min': 120}, 1050), ({'minutes': 95, 'validations': [['free_min', 30]], 'hourly': 350, 'daily_max': 2400, 'max_free_min': 120}, 700), ({'minutes': 977, 'validations': [['flat', 100]], 'hourly': 300, 'daily_max': 2400, 'max_free_min': 180}, 2300), ({'minutes': 150, 'validations': [['free_min', 60], ['free_min', 60], ['free_min', 60]], 'hourly': 300, 'daily_max': 2400, 'max_free_min': 120}, 300), ({'minutes': 1179, 'validations': [['pct', 10], ['flat', 100]], 'hourly': 200, 'daily_max': 3000, 'max_free_min': 180}, 2600), ({'minutes': 226, 'validations': [], 'hourly': 200, 'daily_max': 1800, 'max_free_min': 180}, 800), ({'minutes': 200, 'validations': [['pct', 25], ['pct', 10], ['flat', 100], ['flat', 250]], 'hourly': 300, 'daily_max': 2400, 'max_free_min': 120}, 550)], [({'minutes': 200, 'validations': [['pct', 25], ['pct', 10], ['flat', 100], ['flat', 250]], 'hourly': 300, 'daily_max': 2400, 'max_free_min': 120}, 550), ({'minutes': 753, 'validations': [['flat', 500], ['free_min', 90], ['free_min', 30], ['flat', 250]], 'hourly': 300, 'daily_max': 1800, 'max_free_min': 60}, 1050), ({'minutes': 780, 'validations': [], 'hourly': 350, 'daily_max': 2400, 'max_free_min': 180}, 2400), ({'minutes': 150, 'validations': [['free_min', 60], ['free_min', 60], ['free_min', 60]], 'hourly': 300, 'daily_max': 2400, 'max_free_min': 120}, 300), ({'minutes': 945, 'validations': [['free_min', 60], ['pct', 50], ['free_min', 30]], 'hourly': 200, 'daily_max': 2400, 'max_free_min': 60}, 1200), ({'minutes': 590, 'validations': [['pct', 10], ['flat', 250], ['flat', 500], ['pct', 50]], 'hourly': 200, 'daily_max': 3000, 'max_free_min': 120}, 250), ({'minutes': 738, 'validations': [['free_min', 30], ['free_min', 120], ['flat', 100], ['free_min', 120]], 'hourly': 350, 'daily_max': 2400, 'max_free_min': 120}, 2300), ({'minutes': 95, 'validations': [['free_min', 30]], 'hourly': 350, 'daily_max': 2400, 'max_free_min': 120}, 700)], [({'minutes': 761, 'validations': [['free_min', 90], ['flat', 100], ['free_min', 30], ['flat', 500]], 'hourly': 300, 'daily_max': 2400, 'max_free_min': 120}, 1800), ({'minutes': 745, 'validations': [['flat', 100], ['free_min', 90], ['flat', 250], ['pct', 25]], 'hourly': 350, 'daily_max': 2400, 'max_free_min': 60}, 1450), ({'minutes': 200, 'validations': [['pct', 25], ['pct', 10], ['flat', 100], ['flat', 250]], 'hourly': 300, 'daily_max': 2400, 'max_free_min': 120}, 550), ({'minutes': 1258, 'validations': [], 'hourly': 350, 'daily_max': 3000, 'max_free_min': 60}, 3000), ({'minutes': 1149, 'validations': [], 'hourly': 300, 'daily_max': 2400, 'max_free_min': 60}, 2400), ({'minutes': 1112, 'validations': [['flat', 100], ['pct', 10]], 'hourly': 350, 'daily_max': 3000, 'max_free_min': 60}, 2600), ({'minutes': 150, 'validations': [['free_min', 60], ['free_min', 60], ['free_min', 60]], 'hourly': 300, 'daily_max': 2400, 'max_free_min': 120}, 300), ({'minutes': 95, 'validations': [['free_min', 30]], 'hourly': 350, 'daily_max': 2400, 'max_free_min': 120}, 700)], [({'minutes': 150, 'validations': [['free_min', 60], ['free_min', 60], ['free_min', 60]], 'hourly': 300, 'daily_max': 2400, 'max_free_min': 120}, 300), ({'minutes': 1372, 'validations': [['pct', 10], ['flat', 250], ['flat', 500], ['free_min', 60]], 'hourly': 350, 'daily_max': 3000, 'max_free_min': 60}, 1950), ({'minutes': 95, 'validations': [['free_min', 30]], 'hourly': 350, 'daily_max': 2400, 'max_free_min': 120}, 700), ({'minutes': 814, 'validations': [['free_min', 90], ['pct', 50]], 'hourly': 300, 'daily_max': 1800, 'max_free_min': 120}, 900), ({'minutes': 200, 'validations': [['pct', 25], ['pct', 10], ['flat', 100], ['flat', 250]], 'hourly': 300, 'daily_max': 2400, 'max_free_min': 120}, 550), ({'minutes': 1395, 'validations': [['flat', 250], ['free_min', 90], ['free_min', 90], ['flat', 500]], 'hourly': 300, 'daily_max': 2400, 'max_free_min': 120}, 1650), ({'minutes': 158, 'validations': [['flat', 250], ['free_min', 90], ['free_min', 30], ['pct', 10]], 'hourly': 200, 'daily_max': 3000, 'max_free_min': 120}, 0), ({'minutes': 592, 'validations': [['free_min', 15], ['flat', 250]], 'hourly': 350, 'daily_max': 3000, 'max_free_min': 180}, 2750)], [({'minutes': 542, 'validations': [['free_min', 30], ['pct', 25], ['flat', 100], ['pct', 10]], 'hourly': 350, 'daily_max': 2400, 'max_free_min': 120}, 1700), ({'minutes': 1169, 'validations': [['flat', 250], ['flat', 100]], 'hourly': 300, 'daily_max': 3000, 'max_free_min': 180}, 2650), ({'minutes': 150, 'validations': [['free_min', 60], ['free_min', 60], ['free_min', 60]], 'hourly': 300, 'daily_max': 2400, 'max_free_min': 120}, 300), ({'minutes': 1262, 'validations': [['flat', 100], ['free_min', 90], ['flat', 250]], 'hourly': 200, 'daily_max': 2400, 'max_free_min': 180}, 2050), ({'minutes': 200, 'validations': [['pct', 25], ['pct', 10], ['flat', 100], ['flat', 250]], 'hourly': 300, 'daily_max': 2400, 'max_free_min': 120}, 550), ({'minutes': 593, 'validations': [['flat', 100]], 'hourly': 350, 'daily_max': 2400, 'max_free_min': 180}, 2300), ({'minutes': 95, 'validations': [['free_min', 30]], 'hourly': 350, 'daily_max': 2400, 'max_free_min': 120}, 700), ({'minutes': 1364, 'validations': [['free_min', 60], ['pct', 10]], 'hourly': 200, 'daily_max': 3000, 'max_free_min': 120}, 2700)]]\nfor i, (args, expected) in enumerate(fixtures[N-1]):\n    check('fee oracle' + ' %d' % i, solve(args), expected)\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":"9b2b3b9e29fd4315bb99e856a5e3c4cde7ad1a1a5bbfb2493bf06216f4ff80bc","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(x):\n    free = min(x['max_free_min'], sum(v for k, v in x['validations'] if k == 'free_min'))\n    bill = max(0, x['minutes'] - free)\n    fee = min(x['daily_max'], -(-bill // 60) * x['hourly'])\n    pcts = [v for k, v in x['validations'] if k == 'pct']\n    if pcts:\n        fee -= fee * max(pcts) // 100\n    flat = max([0] + [v for k, v in x['validations'] if k == 'flat'])\n    return max(0, fee - flat)\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = [[({'minutes': 552, 'validations': [['flat', 250], ['flat', 500], ['free_min', 15], ['free_min', 15]], 'hourly': 350, 'daily_max': 3000, 'max_free_min': 120}, 2250), ({'minutes': 839, 'validations': [['flat', 250], ['free_min', 60], ['flat', 500]], 'hourly': 200, 'daily_max': 1800, 'max_free_min': 120}, 1050), ({'minutes': 95, 'validations': [['free_min', 30]], 'hourly': 350, 'daily_max': 2400, 'max_free_min': 120}, 700), ({'minutes': 977, 'validations': [['flat', 100]], 'hourly': 300, 'daily_max': 2400, 'max_free_min': 180}, 2300), ({'minutes': 150, 'validations': [['free_min', 60], ['free_min', 60], ['free_min', 60]], 'hourly': 300, 'daily_max': 2400, 'max_free_min': 120}, 300), ({'minutes': 1179, 'validations': [['pct', 10], ['flat', 100]], 'hourly': 200, 'daily_max': 3000, 'max_free_min': 180}, 2600), ({'minutes': 226, 'validations': [], 'hourly': 200, 'daily_max': 1800, 'max_free_min': 180}, 800), ({'minutes': 200, 'validations': [['pct', 25], ['pct', 10], ['flat', 100], ['flat', 250]], 'hourly': 300, 'daily_max': 2400, 'max_free_min': 120}, 550)], [({'minutes': 200, 'validations': [['pct', 25], ['pct', 10], ['flat', 100], ['flat', 250]], 'hourly': 300, 'daily_max': 2400, 'max_free_min': 120}, 550), ({'minutes': 753, 'validations': [['flat', 500], ['free_min', 90], ['free_min', 30], ['flat', 250]], 'hourly': 300, 'daily_max': 1800, 'max_free_min': 60}, 1050), ({'minutes': 780, 'validations': [], 'hourly': 350, 'daily_max': 2400, 'max_free_min': 180}, 2400), ({'minutes': 150, 'validations': [['free_min', 60], ['free_min', 60], ['free_min', 60]], 'hourly': 300, 'daily_max': 2400, 'max_free_min': 120}, 300), ({'minutes': 945, 'validations': [['free_min', 60], ['pct', 50], ['free_min', 30]], 'hourly': 200, 'daily_max': 2400, 'max_free_min': 60}, 1200), ({'minutes': 590, 'validations': [['pct', 10], ['flat', 250], ['flat', 500], ['pct', 50]], 'hourly': 200, 'daily_max': 3000, 'max_free_min': 120}, 250), ({'minutes': 738, 'validations': [['free_min', 30], ['free_min', 120], ['flat', 100], ['free_min', 120]], 'hourly': 350, 'daily_max': 2400, 'max_free_min': 120}, 2300), ({'minutes': 95, 'validations': [['free_min', 30]], 'hourly': 350, 'daily_max': 2400, 'max_free_min': 120}, 700)], [({'minutes': 761, 'validations': [['free_min', 90], ['flat', 100], ['free_min', 30], ['flat', 500]], 'hourly': 300, 'daily_max': 2400, 'max_free_min': 120}, 1800), ({'minutes': 745, 'validations': [['flat', 100], ['free_min', 90], ['flat', 250], ['pct', 25]], 'hourly': 350, 'daily_max': 2400, 'max_free_min': 60}, 1450), ({'minutes': 200, 'validations': [['pct', 25], ['pct', 10], ['flat', 100], ['flat', 250]], 'hourly': 300, 'daily_max': 2400, 'max_free_min': 120}, 550), ({'minutes': 1258, 'validations': [], 'hourly': 350, 'daily_max': 3000, 'max_free_min': 60}, 3000), ({'minutes': 1149, 'validations': [], 'hourly': 300, 'daily_max': 2400, 'max_free_min': 60}, 2400), ({'minutes': 1112, 'validations': [['flat', 100], ['pct', 10]], 'hourly': 350, 'daily_max': 3000, 'max_free_min': 60}, 2600), ({'minutes': 150, 'validations': [['free_min', 60], ['free_min', 60], ['free_min', 60]], 'hourly': 300, 'daily_max': 2400, 'max_free_min': 120}, 300), ({'minutes': 95, 'validations': [['free_min', 30]], 'hourly': 350, 'daily_max': 2400, 'max_free_min': 120}, 700)], [({'minutes': 150, 'validations': [['free_min', 60], ['free_min', 60], ['free_min', 60]], 'hourly': 300, 'daily_max': 2400, 'max_free_min': 120}, 300), ({'minutes': 1372, 'validations': [['pct', 10], ['flat', 250], ['flat', 500], ['free_min', 60]], 'hourly': 350, 'daily_max': 3000, 'max_free_min': 60}, 1950), ({'minutes': 95, 'validations': [['free_min', 30]], 'hourly': 350, 'daily_max': 2400, 'max_free_min': 120}, 700), ({'minutes': 814, 'validations': [['free_min', 90], ['pct', 50]], 'hourly': 300, 'daily_max': 1800, 'max_free_min': 120}, 900), ({'minutes': 200, 'validations': [['pct', 25], ['pct', 10], ['flat', 100], ['flat', 250]], 'hourly': 300, 'daily_max': 2400, 'max_free_min': 120}, 550), ({'minutes': 1395, 'validations': [['flat', 250], ['free_min', 90], ['free_min', 90], ['flat', 500]], 'hourly': 300, 'daily_max': 2400, 'max_free_min': 120}, 1650), ({'minutes': 158, 'validations': [['flat', 250], ['free_min', 90], ['free_min', 30], ['pct', 10]], 'hourly': 200, 'daily_max': 3000, 'max_free_min': 120}, 0), ({'minutes': 592, 'validations': [['free_min', 15], ['flat', 250]], 'hourly': 350, 'daily_max': 3000, 'max_free_min': 180}, 2750)], [({'minutes': 542, 'validations': [['free_min', 30], ['pct', 25], ['flat', 100], ['pct', 10]], 'hourly': 350, 'daily_max': 2400, 'max_free_min': 120}, 1700), ({'minutes': 1169, 'validations': [['flat', 250], ['flat', 100]], 'hourly': 300, 'daily_max': 3000, 'max_free_min': 180}, 2650), ({'minutes': 150, 'validations': [['free_min', 60], ['free_min', 60], ['free_min', 60]], 'hourly': 300, 'daily_max': 2400, 'max_free_min': 120}, 300), ({'minutes': 1262, 'validations': [['flat', 100], ['free_min', 90], ['flat', 250]], 'hourly': 200, 'daily_max': 2400, 'max_free_min': 180}, 2050), ({'minutes': 200, 'validations': [['pct', 25], ['pct', 10], ['flat', 100], ['flat', 250]], 'hourly': 300, 'daily_max': 2400, 'max_free_min': 120}, 550), ({'minutes': 593, 'validations': [['flat', 100]], 'hourly': 350, 'daily_max': 2400, 'max_free_min': 180}, 2300), ({'minutes': 95, 'validations': [['free_min', 30]], 'hourly': 350, 'daily_max': 2400, 'max_free_min': 120}, 700), ({'minutes': 1364, 'validations': [['free_min', 60], ['pct', 10]], 'hourly': 200, 'daily_max': 3000, 'max_free_min': 120}, 2700)]]\nfor i, (args, expected) in enumerate(fixtures[N-1]):\n    check('fee oracle' + ' %d' % i, solve(args), expected)\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":"A deterministic, bounded toy model with a stipulated contract; it makes no claim of conformance to any agency manual or standard. 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":"w2-toll_and_parking_fee_computation-merchant-validation-flat-sum","generated_at":"2026-09-29T14:48:04.523411+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"Fee engines bill customers in integer cents; a wrong boundary, rounding stage or cap scope silently over- or under-charges.","root_cause":"Flat validations are treated like percentages and not summed.","sha256":"e070d8b07581aed0c47af98de6d2138204c6c91342bf43df3db2cc46bae1cc30","title":"Merchant parking validations: only the largest flat validation applies · 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":41.399,"exit_code":1,"observations":[{"actual":2250,"check":"fee oracle 0","expected":2250,"passed":true},{"actual":1050,"check":"fee oracle 1","expected":1050,"passed":true},{"actual":700,"check":"fee oracle 2","expected":700,"passed":true},{"actual":2300,"check":"fee oracle 3","expected":2300,"passed":true},{"actual":300,"check":"fee oracle 4","expected":300,"passed":true},{"actual":2700,"check":"fee oracle 5","expected":2600,"passed":false},{"actual":800,"check":"fee oracle 6","expected":800,"passed":true},{"actual":900,"check":"fee oracle 7","expected":550,"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fee oracle 0\", \"actual\": 2250, \"expected\": 2250, \"passed\": true}, {\"check\": \"fee oracle 1\", \"actual\": 1050, \"expected\": 1050, \"passed\": true}, {\"check\": \"fee oracle 2\", \"actual\": 700, \"expected\": 700, \"passed\": true}, {\"check\": \"fee oracle 3\", \"actual\": 2300, \"expected\": 2300, \"passed\": true}, {\"check\": \"fee oracle 4\", \"actual\": 300, \"expected\": 300, \"passed\": true}, {\"check\": \"fee oracle 5\", \"actual\": 2700, \"expected\": 2600, \"passed\": false}, {\"check\": \"fee oracle 6\", \"actual\": 800, \"expected\": 800, \"passed\": true}, {\"check\": \"fee oracle 7\", \"actual\": 900, \"expected\": 550, \"passed\": false}], \"passed\": false}\n"},"broken":{"elapsed_ms":40.699,"exit_code":1,"observations":[{"actual":2500,"check":"fee oracle 0","expected":2250,"passed":false},{"actual":1300,"check":"fee oracle 1","expected":1050,"passed":false},{"actual":700,"check":"fee oracle 2","expected":700,"passed":true},{"actual":2300,"check":"fee oracle 3","expected":2300,"passed":true},{"actual":300,"check":"fee oracle 4","expected":300,"passed":true},{"actual":2600,"check":"fee oracle 5","expected":2600,"passed":true},{"actual":800,"check":"fee oracle 6","expected":800,"passed":true},{"actual":650,"check":"fee oracle 7","expected":550,"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fee oracle 0\", \"actual\": 2500, \"expected\": 2250, \"passed\": false}, {\"check\": \"fee oracle 1\", \"actual\": 1300, \"expected\": 1050, \"passed\": false}, {\"check\": \"fee oracle 2\", \"actual\": 700, \"expected\": 700, \"passed\": true}, {\"check\": \"fee oracle 3\", \"actual\": 2300, \"expected\": 2300, \"passed\": true}, {\"check\": \"fee oracle 4\", \"actual\": 300, \"expected\": 300, \"passed\": true}, {\"check\": \"fee oracle 5\", \"actual\": 2600, \"expected\": 2600, \"passed\": true}, {\"check\": \"fee oracle 6\", \"actual\": 800, \"expected\": 800, \"passed\": true}, {\"check\": \"fee oracle 7\", \"actual\": 650, \"expected\": 550, \"passed\": false}], \"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."}}