{"abstract":"Draws accrue no interest on the day they are taken.","category":"Loan amortization schedules","checks":7,"contract":"x = {'rate_bp', 'basis', 'start_balance', 'cycle_days', 'events': [[day 1..cycle_days, signed amount]], 'min_bp', 'min_floor'}. Events take effect at the start of their day. Each day adds max(balance, 0) to the accumulator; interest = round_half_up(acc*bp/(10000*basis)) once per cycle. owed = end balance + interest. Minimum = 0 if owed <= 0 else min(owed, max(min_floor, interest + round_half_up(max(end balance, 0)*min_bp/10000))). Return {'interest', 'balance': owed, 'minimum', 'adb': acc // cycle_days}.","contract_signature":"x","evaluation_group":"w2-loan-amortization-schedules-credit-line-daily-balance","failed_approach":"Shifting the day range adds a phantom day zero and drops the last day transactions.","family":"w2-loan-amortization-schedules-credit-line-daily-balance-event-effective-day","id":"FA-58791","implementations":{"attempt":{"sha256":"ddd4c16c24c4aa274e8df73355ff6a7ae1944eea431b165a3374f45db5f53a22","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(x):\n    def rnd(n, d):\n        q, r = divmod(n, d)\n        return q + (1 if 2 * r >= d else 0)\n    bal = x['start_balance']\n    ev = sorted(x['events'])\n    i = 0\n    acc = 0\n    for day in range(0, x['cycle_days']):\n        acc += max(bal, 0)\n        while i < len(ev) and ev[i][0] == day:\n            bal += ev[i][1]\n            i += 1\n    interest = rnd(acc * x['rate_bp'], 10000 * x['basis'])\n    owed = bal + interest\n    if owed <= 0:\n        minimum = 0\n    else:\n        minimum = min(owed, max(x['min_floor'], interest + rnd(max(bal, 0) * x['min_bp'], 10000)))\n    return {'interest': interest, 'balance': owed, 'minimum': minimum, 'adb': acc // x['cycle_days']}\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = [[['regression: event effective day', {'rate_bp': 600, 'basis': 365, 'start_balance': 1000000, 'cycle_days': 31, 'events': [[4, 5000], [24, -20000], [10, 10000]], 'min_bp': 100, 'min_floor': 2500}, {'interest': 5129, 'balance': 1000129, 'minimum': 15079, 'adb': 1006451}], ['control 1', {'rate_bp': 1200, 'basis': 365, 'start_balance': 0, 'cycle_days': 30, 'events': [[6, -80000], [30, -80000], [3, 10000]], 'min_bp': 100, 'min_floor': 2500}, {'interest': 10, 'balance': -149990, 'minimum': 0, 'adb': 1000}], ['control 2', {'rate_bp': 850, 'basis': 365, 'start_balance': 0, 'cycle_days': 28, 'events': [], 'min_bp': 150, 'min_floor': 2500}, {'interest': 0, 'balance': 0, 'minimum': 0, 'adb': 0}], ['control 3', {'rate_bp': 1200, 'basis': 365, 'start_balance': 0, 'cycle_days': 28, 'events': [[9, 10000], [16, 10000], [22, -80000], [9, 10000]], 'min_bp': 100, 'min_floor': 10000}, {'interest': 105, 'balance': -49895, 'minimum': 0, 'adb': 11428}], ['control 4', {'rate_bp': 1200, 'basis': 365, 'start_balance': 1000000, 'cycle_days': 31, 'events': [], 'min_bp': 150, 'min_floor': 10000}, {'interest': 10192, 'balance': 1010192, 'minimum': 25192, 'adb': 1000000}], ['control 5', {'rate_bp': 600, 'basis': 365, 'start_balance': 0, 'cycle_days': 30, 'events': [[23, -20000], [29, 10000]], 'min_bp': 150, 'min_floor': 2500}, {'interest': 0, 'balance': -10000, 'minimum': 0, 'adb': 0}], ['control 6', {'rate_bp': 600, 'basis': 365, 'start_balance': 30000, 'cycle_days': 28, 'events': [], 'min_bp': 150, 'min_floor': 10000}, {'interest': 138, 'balance': 30138, 'minimum': 10000, 'adb': 30000}]], [['regression: event effective day', {'rate_bp': 1200, 'basis': 365, 'start_balance': 100000, 'cycle_days': 28, 'events': [[1, 50000], [6, 5000], [24, 10000], [18, -80000]], 'min_bp': 150, 'min_floor': 2500}, {'interest': 1146, 'balance': 86146, 'minimum': 2500, 'adb': 124464}], ['control 1', {'rate_bp': 850, 'basis': 365, 'start_balance': 0, 'cycle_days': 30, 'events': [[25, 10000], [30, -20000]], 'min_bp': 150, 'min_floor': 10000}, {'interest': 12, 'balance': -9988, 'minimum': 0, 'adb': 1666}], ['control 2', {'rate_bp': 850, 'basis': 365, 'start_balance': 100000, 'cycle_days': 31, 'events': [], 'min_bp': 150, 'min_floor': 10000}, {'interest': 722, 'balance': 100722, 'minimum': 10000, 'adb': 100000}], ['control 3', {'rate_bp': 850, 'basis': 365, 'start_balance': 0, 'cycle_days': 31, 'events': [[9, -80000], [20, -20000], [4, 5000]], 'min_bp': 150, 'min_floor': 2500}, {'interest': 6, 'balance': -94994, 'minimum': 0, 'adb': 806}], ['control 4', {'rate_bp': 600, 'basis': 365, 'start_balance': 0, 'cycle_days': 28, 'events': [[23, 5000], [9, -20000]], 'min_bp': 150, 'min_floor': 10000}, {'interest': 0, 'balance': -15000, 'minimum': 0, 'adb': 0}], ['control 5', {'rate_bp': 600, 'basis': 365, 'start_balance': 0, 'cycle_days': 28, 'events': [[19, 5000], [4, 10000], [12, -80000], [5, -20000]], 'min_bp': 150, 'min_floor': 2500}, {'interest': 2, 'balance': -84998, 'minimum': 0, 'adb': 357}], ['control 6', {'rate_bp': 1200, 'basis': 365, 'start_balance': 0, 'cycle_days': 28, 'events': [], 'min_bp': 150, 'min_floor': 10000}, {'interest': 0, 'balance': 0, 'minimum': 0, 'adb': 0}]], [['regression: event effective day', {'rate_bp': 600, 'basis': 365, 'start_balance': 1000000, 'cycle_days': 28, 'events': [[8, 5000]], 'min_bp': 100, 'min_floor': 2500}, {'interest': 4620, 'balance': 1009620, 'minimum': 14670, 'adb': 1003750}], ['control 1', {'rate_bp': 1200, 'basis': 365, 'start_balance': 0, 'cycle_days': 28, 'events': [[3, 5000], [20, 5000], [25, -20000]], 'min_bp': 150, 'min_floor': 10000}, {'interest': 44, 'balance': -9956, 'minimum': 0, 'adb': 4821}], ['control 2', {'rate_bp': 850, 'basis': 365, 'start_balance': 0, 'cycle_days': 28, 'events': [[5, -80000]], 'min_bp': 100, 'min_floor': 2500}, {'interest': 0, 'balance': -80000, 'minimum': 0, 'adb': 0}], ['control 3', {'rate_bp': 600, 'basis': 365, 'start_balance': 0, 'cycle_days': 28, 'events': [], 'min_bp': 100, 'min_floor': 2500}, {'interest': 0, 'balance': 0, 'minimum': 0, 'adb': 0}], ['control 4', {'rate_bp': 850, 'basis': 365, 'start_balance': 0, 'cycle_days': 30, 'events': [], 'min_bp': 150, 'min_floor': 10000}, {'interest': 0, 'balance': 0, 'minimum': 0, 'adb': 0}], ['control 5', {'rate_bp': 1200, 'basis': 365, 'start_balance': 100000, 'cycle_days': 28, 'events': [], 'min_bp': 150, 'min_floor': 10000}, {'interest': 921, 'balance': 100921, 'minimum': 10000, 'adb': 100000}], ['control 6', {'rate_bp': 1200, 'basis': 365, 'start_balance': 0, 'cycle_days': 31, 'events': [[20, 5000], [23, -80000]], 'min_bp': 150, 'min_floor': 2500}, {'interest': 5, 'balance': -74995, 'minimum': 0, 'adb': 483}]], [['regression: event effective day', {'rate_bp': 850, 'basis': 365, 'start_balance': 100000, 'cycle_days': 30, 'events': [[20, 50000], [29, -80000], [30, -80000]], 'min_bp': 100, 'min_floor': 10000}, {'interest': 773, 'balance': -9227, 'minimum': 0, 'adb': 110666}], ['control 1', {'rate_bp': 600, 'basis': 365, 'start_balance': 30000, 'cycle_days': 28, 'events': [], 'min_bp': 150, 'min_floor': 2500}, {'interest': 138, 'balance': 30138, 'minimum': 2500, 'adb': 30000}], ['control 2', {'rate_bp': 1200, 'basis': 365, 'start_balance': 1000000, 'cycle_days': 31, 'events': [], 'min_bp': 100, 'min_floor': 10000}, {'interest': 10192, 'balance': 1010192, 'minimum': 20192, 'adb': 1000000}], ['control 3', {'rate_bp': 1200, 'basis': 365, 'start_balance': 30000, 'cycle_days': 28, 'events': [], 'min_bp': 100, 'min_floor': 10000}, {'interest': 276, 'balance': 30276, 'minimum': 10000, 'adb': 30000}], ['control 4', {'rate_bp': 850, 'basis': 365, 'start_balance': 0, 'cycle_days': 31, 'events': [[30, 10000], [22, -20000], [23, 5000]], 'min_bp': 100, 'min_floor': 10000}, {'interest': 0, 'balance': -5000, 'minimum': 0, 'adb': 0}], ['control 5', {'rate_bp': 1200, 'basis': 365, 'start_balance': 30000, 'cycle_days': 30, 'events': [], 'min_bp': 100, 'min_floor': 10000}, {'interest': 296, 'balance': 30296, 'minimum': 10000, 'adb': 30000}], ['control 6', {'rate_bp': 1200, 'basis': 365, 'start_balance': 0, 'cycle_days': 28, 'events': [[2, -20000], [14, 10000], [20, -20000], [27, 10000]], 'min_bp': 150, 'min_floor': 10000}, {'interest': 0, 'balance': -20000, 'minimum': 0, 'adb': 0}]], [['regression: event effective day', {'rate_bp': 600, 'basis': 365, 'start_balance': 1000000, 'cycle_days': 28, 'events': [[21, 10000], [25, -80000]], 'min_bp': 100, 'min_floor': 2500}, {'interest': 4563, 'balance': 934563, 'minimum': 13863, 'adb': 991428}], ['control 1', {'rate_bp': 600, 'basis': 365, 'start_balance': 0, 'cycle_days': 31, 'events': [[15, 50000], [8, -80000], [21, 5000], [31, -20000]], 'min_bp': 150, 'min_floor': 10000}, {'interest': 0, 'balance': -45000, 'minimum': 0, 'adb': 0}], ['control 2', {'rate_bp': 1200, 'basis': 365, 'start_balance': 0, 'cycle_days': 28, 'events': [[5, -80000], [22, 5000]], 'min_bp': 100, 'min_floor': 10000}, {'interest': 0, 'balance': -75000, 'minimum': 0, 'adb': 0}], ['control 3', {'rate_bp': 600, 'basis': 365, 'start_balance': 0, 'cycle_days': 31, 'events': [[8, 5000], [3, 5000], [27, 10000], [28, -80000]], 'min_bp': 100, 'min_floor': 2500}, {'interest': 39, 'balance': -59961, 'minimum': 0, 'adb': 7580}], ['control 4', {'rate_bp': 600, 'basis': 365, 'start_balance': 30000, 'cycle_days': 31, 'events': [[13, 50000], [16, -20000], [7, -80000], [18, 50000]], 'min_bp': 100, 'min_floor': 2500}, {'interest': 99, 'balance': 30099, 'minimum': 2500, 'adb': 19354}], ['control 5', {'rate_bp': 1200, 'basis': 365, 'start_balance': 0, 'cycle_days': 28, 'events': [[4, -20000], [25, 5000]], 'min_bp': 100, 'min_floor': 2500}, {'interest': 0, 'balance': -15000, 'minimum': 0, 'adb': 0}], ['control 6', {'rate_bp': 600, 'basis': 365, 'start_balance': 1000000, 'cycle_days': 31, 'events': [], 'min_bp': 100, 'min_floor': 10000}, {'interest': 5096, 'balance': 1005096, 'minimum': 15096, 'adb': 1000000}]]]\nfor label, args, expected in fixtures[N-1]:\n    try:\n        actual = solve(args)\n    except Exception as exc:\n        actual = 'raised ' + type(exc).__name__\n    check(label, actual, 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":"63d7ebf39598605f8197a7539adf77a4b55f3c898dfaa804bcc8ae5aebb8e215","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(x):\n    def rnd(n, d):\n        q, r = divmod(n, d)\n        return q + (1 if 2 * r >= d else 0)\n    bal = x['start_balance']\n    ev = sorted(x['events'])\n    i = 0\n    acc = 0\n    for day in range(1, x['cycle_days'] + 1):\n        acc += max(bal, 0)\n        while i < len(ev) and ev[i][0] == day:\n            bal += ev[i][1]\n            i += 1\n    interest = rnd(acc * x['rate_bp'], 10000 * x['basis'])\n    owed = bal + interest\n    if owed <= 0:\n        minimum = 0\n    else:\n        minimum = min(owed, max(x['min_floor'], interest + rnd(max(bal, 0) * x['min_bp'], 10000)))\n    return {'interest': interest, 'balance': owed, 'minimum': minimum, 'adb': acc // x['cycle_days']}\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = [[['regression: event effective day', {'rate_bp': 600, 'basis': 365, 'start_balance': 1000000, 'cycle_days': 31, 'events': [[4, 5000], [24, -20000], [10, 10000]], 'min_bp': 100, 'min_floor': 2500}, {'interest': 5129, 'balance': 1000129, 'minimum': 15079, 'adb': 1006451}], ['control 1', {'rate_bp': 1200, 'basis': 365, 'start_balance': 0, 'cycle_days': 30, 'events': [[6, -80000], [30, -80000], [3, 10000]], 'min_bp': 100, 'min_floor': 2500}, {'interest': 10, 'balance': -149990, 'minimum': 0, 'adb': 1000}], ['control 2', {'rate_bp': 850, 'basis': 365, 'start_balance': 0, 'cycle_days': 28, 'events': [], 'min_bp': 150, 'min_floor': 2500}, {'interest': 0, 'balance': 0, 'minimum': 0, 'adb': 0}], ['control 3', {'rate_bp': 1200, 'basis': 365, 'start_balance': 0, 'cycle_days': 28, 'events': [[9, 10000], [16, 10000], [22, -80000], [9, 10000]], 'min_bp': 100, 'min_floor': 10000}, {'interest': 105, 'balance': -49895, 'minimum': 0, 'adb': 11428}], ['control 4', {'rate_bp': 1200, 'basis': 365, 'start_balance': 1000000, 'cycle_days': 31, 'events': [], 'min_bp': 150, 'min_floor': 10000}, {'interest': 10192, 'balance': 1010192, 'minimum': 25192, 'adb': 1000000}], ['control 5', {'rate_bp': 600, 'basis': 365, 'start_balance': 0, 'cycle_days': 30, 'events': [[23, -20000], [29, 10000]], 'min_bp': 150, 'min_floor': 2500}, {'interest': 0, 'balance': -10000, 'minimum': 0, 'adb': 0}], ['control 6', {'rate_bp': 600, 'basis': 365, 'start_balance': 30000, 'cycle_days': 28, 'events': [], 'min_bp': 150, 'min_floor': 10000}, {'interest': 138, 'balance': 30138, 'minimum': 10000, 'adb': 30000}]], [['regression: event effective day', {'rate_bp': 1200, 'basis': 365, 'start_balance': 100000, 'cycle_days': 28, 'events': [[1, 50000], [6, 5000], [24, 10000], [18, -80000]], 'min_bp': 150, 'min_floor': 2500}, {'interest': 1146, 'balance': 86146, 'minimum': 2500, 'adb': 124464}], ['control 1', {'rate_bp': 850, 'basis': 365, 'start_balance': 0, 'cycle_days': 30, 'events': [[25, 10000], [30, -20000]], 'min_bp': 150, 'min_floor': 10000}, {'interest': 12, 'balance': -9988, 'minimum': 0, 'adb': 1666}], ['control 2', {'rate_bp': 850, 'basis': 365, 'start_balance': 100000, 'cycle_days': 31, 'events': [], 'min_bp': 150, 'min_floor': 10000}, {'interest': 722, 'balance': 100722, 'minimum': 10000, 'adb': 100000}], ['control 3', {'rate_bp': 850, 'basis': 365, 'start_balance': 0, 'cycle_days': 31, 'events': [[9, -80000], [20, -20000], [4, 5000]], 'min_bp': 150, 'min_floor': 2500}, {'interest': 6, 'balance': -94994, 'minimum': 0, 'adb': 806}], ['control 4', {'rate_bp': 600, 'basis': 365, 'start_balance': 0, 'cycle_days': 28, 'events': [[23, 5000], [9, -20000]], 'min_bp': 150, 'min_floor': 10000}, {'interest': 0, 'balance': -15000, 'minimum': 0, 'adb': 0}], ['control 5', {'rate_bp': 600, 'basis': 365, 'start_balance': 0, 'cycle_days': 28, 'events': [[19, 5000], [4, 10000], [12, -80000], [5, -20000]], 'min_bp': 150, 'min_floor': 2500}, {'interest': 2, 'balance': -84998, 'minimum': 0, 'adb': 357}], ['control 6', {'rate_bp': 1200, 'basis': 365, 'start_balance': 0, 'cycle_days': 28, 'events': [], 'min_bp': 150, 'min_floor': 10000}, {'interest': 0, 'balance': 0, 'minimum': 0, 'adb': 0}]], [['regression: event effective day', {'rate_bp': 600, 'basis': 365, 'start_balance': 1000000, 'cycle_days': 28, 'events': [[8, 5000]], 'min_bp': 100, 'min_floor': 2500}, {'interest': 4620, 'balance': 1009620, 'minimum': 14670, 'adb': 1003750}], ['control 1', {'rate_bp': 1200, 'basis': 365, 'start_balance': 0, 'cycle_days': 28, 'events': [[3, 5000], [20, 5000], [25, -20000]], 'min_bp': 150, 'min_floor': 10000}, {'interest': 44, 'balance': -9956, 'minimum': 0, 'adb': 4821}], ['control 2', {'rate_bp': 850, 'basis': 365, 'start_balance': 0, 'cycle_days': 28, 'events': [[5, -80000]], 'min_bp': 100, 'min_floor': 2500}, {'interest': 0, 'balance': -80000, 'minimum': 0, 'adb': 0}], ['control 3', {'rate_bp': 600, 'basis': 365, 'start_balance': 0, 'cycle_days': 28, 'events': [], 'min_bp': 100, 'min_floor': 2500}, {'interest': 0, 'balance': 0, 'minimum': 0, 'adb': 0}], ['control 4', {'rate_bp': 850, 'basis': 365, 'start_balance': 0, 'cycle_days': 30, 'events': [], 'min_bp': 150, 'min_floor': 10000}, {'interest': 0, 'balance': 0, 'minimum': 0, 'adb': 0}], ['control 5', {'rate_bp': 1200, 'basis': 365, 'start_balance': 100000, 'cycle_days': 28, 'events': [], 'min_bp': 150, 'min_floor': 10000}, {'interest': 921, 'balance': 100921, 'minimum': 10000, 'adb': 100000}], ['control 6', {'rate_bp': 1200, 'basis': 365, 'start_balance': 0, 'cycle_days': 31, 'events': [[20, 5000], [23, -80000]], 'min_bp': 150, 'min_floor': 2500}, {'interest': 5, 'balance': -74995, 'minimum': 0, 'adb': 483}]], [['regression: event effective day', {'rate_bp': 850, 'basis': 365, 'start_balance': 100000, 'cycle_days': 30, 'events': [[20, 50000], [29, -80000], [30, -80000]], 'min_bp': 100, 'min_floor': 10000}, {'interest': 773, 'balance': -9227, 'minimum': 0, 'adb': 110666}], ['control 1', {'rate_bp': 600, 'basis': 365, 'start_balance': 30000, 'cycle_days': 28, 'events': [], 'min_bp': 150, 'min_floor': 2500}, {'interest': 138, 'balance': 30138, 'minimum': 2500, 'adb': 30000}], ['control 2', {'rate_bp': 1200, 'basis': 365, 'start_balance': 1000000, 'cycle_days': 31, 'events': [], 'min_bp': 100, 'min_floor': 10000}, {'interest': 10192, 'balance': 1010192, 'minimum': 20192, 'adb': 1000000}], ['control 3', {'rate_bp': 1200, 'basis': 365, 'start_balance': 30000, 'cycle_days': 28, 'events': [], 'min_bp': 100, 'min_floor': 10000}, {'interest': 276, 'balance': 30276, 'minimum': 10000, 'adb': 30000}], ['control 4', {'rate_bp': 850, 'basis': 365, 'start_balance': 0, 'cycle_days': 31, 'events': [[30, 10000], [22, -20000], [23, 5000]], 'min_bp': 100, 'min_floor': 10000}, {'interest': 0, 'balance': -5000, 'minimum': 0, 'adb': 0}], ['control 5', {'rate_bp': 1200, 'basis': 365, 'start_balance': 30000, 'cycle_days': 30, 'events': [], 'min_bp': 100, 'min_floor': 10000}, {'interest': 296, 'balance': 30296, 'minimum': 10000, 'adb': 30000}], ['control 6', {'rate_bp': 1200, 'basis': 365, 'start_balance': 0, 'cycle_days': 28, 'events': [[2, -20000], [14, 10000], [20, -20000], [27, 10000]], 'min_bp': 150, 'min_floor': 10000}, {'interest': 0, 'balance': -20000, 'minimum': 0, 'adb': 0}]], [['regression: event effective day', {'rate_bp': 600, 'basis': 365, 'start_balance': 1000000, 'cycle_days': 28, 'events': [[21, 10000], [25, -80000]], 'min_bp': 100, 'min_floor': 2500}, {'interest': 4563, 'balance': 934563, 'minimum': 13863, 'adb': 991428}], ['control 1', {'rate_bp': 600, 'basis': 365, 'start_balance': 0, 'cycle_days': 31, 'events': [[15, 50000], [8, -80000], [21, 5000], [31, -20000]], 'min_bp': 150, 'min_floor': 10000}, {'interest': 0, 'balance': -45000, 'minimum': 0, 'adb': 0}], ['control 2', {'rate_bp': 1200, 'basis': 365, 'start_balance': 0, 'cycle_days': 28, 'events': [[5, -80000], [22, 5000]], 'min_bp': 100, 'min_floor': 10000}, {'interest': 0, 'balance': -75000, 'minimum': 0, 'adb': 0}], ['control 3', {'rate_bp': 600, 'basis': 365, 'start_balance': 0, 'cycle_days': 31, 'events': [[8, 5000], [3, 5000], [27, 10000], [28, -80000]], 'min_bp': 100, 'min_floor': 2500}, {'interest': 39, 'balance': -59961, 'minimum': 0, 'adb': 7580}], ['control 4', {'rate_bp': 600, 'basis': 365, 'start_balance': 30000, 'cycle_days': 31, 'events': [[13, 50000], [16, -20000], [7, -80000], [18, 50000]], 'min_bp': 100, 'min_floor': 2500}, {'interest': 99, 'balance': 30099, 'minimum': 2500, 'adb': 19354}], ['control 5', {'rate_bp': 1200, 'basis': 365, 'start_balance': 0, 'cycle_days': 28, 'events': [[4, -20000], [25, 5000]], 'min_bp': 100, 'min_floor': 2500}, {'interest': 0, 'balance': -15000, 'minimum': 0, 'adb': 0}], ['control 6', {'rate_bp': 600, 'basis': 365, 'start_balance': 1000000, 'cycle_days': 31, 'events': [], 'min_bp': 100, 'min_floor': 10000}, {'interest': 5096, 'balance': 1005096, 'minimum': 15096, 'adb': 1000000}]]]\nfor label, args, expected in fixtures[N-1]:\n    try:\n        actual = solve(args)\n    except Exception as exc:\n        actual = 'raised ' + type(exc).__name__\n    check(label, actual, 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 teaching model with stipulated toy lending rules stated in the contract; money is integer cents and rates are basis points; it makes no claim of conformance to any regulation, servicing standard or product. 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-loan-amortization-schedules-credit-line-daily-balance-event-effective-day","generated_at":"2026-09-29T14:46:30.084375+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"Amortization engines drive borrower statements, payoff quotes and investor remittances; a misplaced rounding step, boundary or ordering rule compounds across hundreds of periods.","root_cause":"The day is accrued before applying that day transactions.","sha256":"a69d4f4b19a3226b5bad9c1018c2dd3b1175a495285947c2ff1daee70fd24bd0","title":"Credit line average daily balance: event effective day · 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":41.516,"exit_code":1,"observations":[{"actual":{"adb":1006774,"balance":1000130,"interest":5130,"minimum":15080},"check":"regression: event effective day","expected":{"adb":1006451,"balance":1000129,"interest":5129,"minimum":15079},"passed":false},{"actual":{"adb":1000,"balance":-69990,"interest":10,"minimum":0},"check":"control 1","expected":{"adb":1000,"balance":-149990,"interest":10,"minimum":0},"passed":false},{"actual":{"adb":0,"balance":0,"interest":0,"minimum":0},"check":"control 2","expected":{"adb":0,"balance":0,"interest":0,"minimum":0},"passed":true},{"actual":{"adb":11428,"balance":-49895,"interest":105,"minimum":0},"check":"control 3","expected":{"adb":11428,"balance":-49895,"interest":105,"minimum":0},"passed":true},{"actual":{"adb":1000000,"balance":1010192,"interest":10192,"minimum":25192},"check":"control 4","expected":{"adb":1000000,"balance":1010192,"interest":10192,"minimum":25192},"passed":true},{"actual":{"adb":0,"balance":-10000,"interest":0,"minimum":0},"check":"control 5","expected":{"adb":0,"balance":-10000,"interest":0,"minimum":0},"passed":true},{"actual":{"adb":30000,"balance":30138,"interest":138,"minimum":10000},"check":"control 6","expected":{"adb":30000,"balance":30138,"interest":138,"minimum":10000},"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"regression: event effective day\", \"actual\": {\"interest\": 5130, \"balance\": 1000130, \"minimum\": 15080, \"adb\": 1006774}, \"expected\": {\"interest\": 5129, \"balance\": 1000129, \"minimum\": 15079, \"adb\": 1006451}, \"passed\": false}, {\"check\": \"control 1\", \"actual\": {\"interest\": 10, \"balance\": -69990, \"minimum\": 0, \"adb\": 1000}, \"expected\": {\"interest\": 10, \"balance\": -149990, \"minimum\": 0, \"adb\": 1000}, \"passed\": false}, {\"check\": \"control 2\", 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