{"abstract":"Foreign payables are understated at period end.","category":"Double-entry ledger accounting","checks":7,"contract":"x = {'bid': [num, den], 'ask': [num, den], 'accounts': [[name, 'asset'|'liability', monetary, foreign units, carried home cents]]}. Monetary assets are revalued at the bid rate and monetary liabilities at the ask rate: home = foreign * num / den rounded half-up per account. Non-monetary accounts keep their carried amount. Unrealized gain sums (new - carried) for assets and (carried - new) for liabilities. Return {'balances': [[name, home]], 'unrealized_gain'}.","evaluation_group":"w2-double-entry-ledger-accounting-fx-revaluation","failed_approach":"Swapping the rates misprices both assets and liabilities.","family":"w2-double-entry-ledger-accounting-fx-revaluation-bid-and-ask-selection","id":"FA-58001","implementations":{"attempt":{"sha256":"24848a04751378672bd15d21fe463d1d44f4b82c7ef3dfceb1c390e1f6869fd6","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(x):\n    def to_home(amount, rate):\n        num, den = rate\n        q, r = divmod(amount * num, den)\n        return q + (1 if 2 * r >= den else 0)\n    gain = 0\n    out = []\n    for name, kind, monetary, foreign, carried in x['accounts']:\n        if not monetary:\n            out.append([name, carried])\n            continue\n        rate = x['ask'] if kind == 'asset' else x['bid']\n        new = to_home(foreign, rate)\n        delta = new - carried\n        gain += delta if kind == 'asset' else -delta\n        out.append([name, new])\n    return {'balances': out, 'unrealized_gain': gain}\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = [[['regression: bid and ask selection', {'bid': [9, 8], 'ask': [12, 8], 'accounts': [['a0', 'liability', True, 5, 10], ['a1', 'asset', True, 101, 101], ['a2', 'asset', True, 7, 7], ['a3', 'asset', False, 250, 500]]}, {'balances': [['a0', 8], ['a1', 114], ['a2', 8], ['a3', 500]], 'unrealized_gain': 16}], ['control 1', {'bid': [124, 100], 'ask': [125, 100], 'accounts': [['a0', 'liability', True, 7, 14], ['a1', 'liability', False, 7, 7], ['a2', 'liability', True, 5, 8]]}, {'balances': [['a0', 9], ['a1', 7], ['a2', 6]], 'unrealized_gain': 7}], ['control 2', {'bid': [3, 4], 'ask': [4, 4], 'accounts': [['a0', 'asset', True, 7, 10], ['a1', 'asset', False, 7, 500]]}, {'balances': [['a0', 5], ['a1', 500]], 'unrealized_gain': -5}], ['control 3', {'bid': [18, 10], 'ask': [19, 10], 'accounts': [['a0', 'asset', False, 999, 500], ['a1', 'liability', False, 999, 1002], ['a2', 'liability', True, 1, 500], ['a3', 'liability', True, 1, 500], ['a4', 'asset', False, 1000, 1003]]}, {'balances': [['a0', 500], ['a1', 1002], ['a2', 2], ['a3', 2], ['a4', 1003]], 'unrealized_gain': 996}], ['control 4', {'bid': [8, 4], 'ask': [11, 4], 'accounts': [['a0', 'asset', True, 1000, 1000], ['a1', 'asset', False, 7, 7], ['a2', 'asset', True, 250, 250], ['a3', 'liability', False, 5, 8], ['a4', 'liability', False, 1000, 1000]]}, {'balances': [['a0', 2000], ['a1', 7], ['a2', 500], ['a3', 8], ['a4', 1000]], 'unrealized_gain': 1250}], ['control 5', {'bid': [5, 8], 'ask': [6, 8], 'accounts': [['a0', 'asset', True, 101, 101], ['a1', 'asset', False, 1, 4]]}, {'balances': [['a0', 63], ['a1', 4]], 'unrealized_gain': -38}], ['control 6', {'bid': [1, 2], 'ask': [2, 2], 'accounts': [['a0', 'asset', True, 999, 1998], ['a1', 'liability', False, 999, 999], ['a2', 'asset', True, 250, 500]]}, {'balances': [['a0', 500], ['a1', 999], ['a2', 125]], 'unrealized_gain': -1873}]], [['regression: bid and ask selection', {'bid': [15, 8], 'ask': [17, 8], 'accounts': [['a0', 'liability', True, 999, 999], ['a1', 'liability', True, 101, 101], ['a2', 'asset', True, 7, 7], ['a3', 'liability', True, 101, 202]]}, {'balances': [['a0', 2123], ['a1', 215], ['a2', 13], ['a3', 215]], 'unrealized_gain': -1245}], ['control 1', {'bid': [133, 100], 'ask': [135, 100], 'accounts': [['a0', 'liability', False, 3, 6], ['a1', 'asset', True, 1, 1], ['a2', 'liability', True, 7, 500], ['a3', 'liability', True, 3, 6]]}, {'balances': [['a0', 6], ['a1', 1], ['a2', 9], ['a3', 4]], 'unrealized_gain': 493}], ['control 2', {'bid': [119, 100], 'ask': [120, 100], 'accounts': [['a0', 'asset', False, 5, 500], ['a1', 'liability', False, 999, 500]]}, {'balances': [['a0', 500], ['a1', 500]], 'unrealized_gain': 0}], ['control 3', {'bid': [188, 100], 'ask': [189, 100], 'accounts': [['a0', 'asset', False, 1000, 1000], ['a1', 'asset', False, 1000, 1000], ['a2', 'asset', False, 5, 5], ['a3', 'asset', True, 1000, 1003]]}, {'balances': [['a0', 1000], ['a1', 1000], ['a2', 5], ['a3', 1880]], 'unrealized_gain': 877}], ['control 4', {'bid': [15, 8], 'ask': [16, 8], 'accounts': [['a0', 'asset', True, 999, 500], ['a1', 'asset', False, 3, 6], ['a2', 'asset', True, 999, 1998], ['a3', 'asset', True, 3, 3], ['a4', 'asset', True, 1, 4]]}, {'balances': [['a0', 1873], ['a1', 6], ['a2', 1873], ['a3', 6], ['a4', 2]], 'unrealized_gain': 1249}], ['control 5', {'bid': [4, 8], 'ask': [5, 8], 'accounts': [['a0', 'liability', False, 1, 2], ['a1', 'liability', True, 5, 500], ['a2', 'asset', True, 1, 4], ['a3', 'asset', True, 999, 1002], ['a4', 'liability', True, 5, 5]]}, {'balances': [['a0', 2], ['a1', 3], ['a2', 1], ['a3', 500], ['a4', 3]], 'unrealized_gain': -6}], ['control 6', {'bid': [3, 2], 'ask': [4, 2], 'accounts': [['a0', 'asset', True, 7, 500], ['a1', 'liability', True, 1, 1], ['a2', 'asset', True, 250, 500]]}, {'balances': [['a0', 11], ['a1', 2], ['a2', 375]], 'unrealized_gain': -615}]], [['regression: bid and ask selection', {'bid': [12, 10], 'ask': [14, 10], 'accounts': [['a0', 'asset', False, 1000, 2000], ['a1', 'liability', True, 1, 2], ['a2', 'liability', True, 3, 3], ['a3', 'liability', True, 999, 1002]]}, {'balances': [['a0', 2000], ['a1', 1], ['a2', 4], ['a3', 1399]], 'unrealized_gain': -397}], ['control 1', {'bid': [2, 2], 'ask': [3, 2], 'accounts': [['a0', 'asset', True, 3, 3], ['a1', 'asset', False, 5, 500], ['a2', 'asset', False, 999, 1998], ['a3', 'asset', True, 5, 5], ['a4', 'liability', False, 7, 14]]}, {'balances': [['a0', 3], ['a1', 500], ['a2', 1998], ['a3', 5], ['a4', 14]], 'unrealized_gain': 0}], ['control 2', {'bid': [130, 100], 'ask': [132, 100], 'accounts': [['a0', 'asset', True, 1, 4], ['a1', 'asset', True, 7, 500]]}, {'balances': [['a0', 1], ['a1', 9]], 'unrealized_gain': -494}], ['control 3', {'bid': [81, 100], 'ask': [83, 100], 'accounts': [['a0', 'asset', True, 1, 500], ['a1', 'asset', False, 1000, 500], ['a2', 'asset', True, 1000, 1003]]}, {'balances': [['a0', 1], ['a1', 500], ['a2', 810]], 'unrealized_gain': -692}], ['control 4', {'bid': [6, 4], 'ask': [7, 4], 'accounts': [['a0', 'liability', False, 999, 999], ['a1', 'asset', False, 999, 1002], ['a2', 'asset', True, 1, 4]]}, {'balances': [['a0', 999], ['a1', 1002], ['a2', 2]], 'unrealized_gain': -2}], ['control 5', {'bid': [12, 10], 'ask': [13, 10], 'accounts': [['a0', 'liability', False, 1000, 2000], ['a1', 'asset', True, 1000, 2000], ['a2', 'liability', True, 1, 2], ['a3', 'asset', True, 3, 500]]}, {'balances': [['a0', 2000], ['a1', 1200], ['a2', 1], ['a3', 4]], 'unrealized_gain': -1295}], ['control 6', {'bid': [9, 8], 'ask': [12, 8], 'accounts': [['a0', 'asset', True, 1, 500], ['a1', 'asset', True, 101, 500], ['a2', 'asset', True, 1000, 1003]]}, {'balances': [['a0', 1], ['a1', 114], ['a2', 1125]], 'unrealized_gain': -763}]], [['regression: bid and ask selection', {'bid': [3, 2], 'ask': [4, 2], 'accounts': [['a0', 'liability', True, 999, 500], ['a1', 'liability', False, 3, 3], ['a2', 'liability', True, 5, 10]]}, {'balances': [['a0', 1998], ['a1', 3], ['a2', 10]], 'unrealized_gain': -1498}], ['control 1', {'bid': [8, 10], 'ask': [9, 10], 'accounts': [['a0', 'liability', True, 1, 4], ['a1', 'asset', True, 250, 500], ['a2', 'asset', False, 101, 104], ['a3', 'asset', True, 1, 1]]}, {'balances': [['a0', 1], ['a1', 200], ['a2', 104], ['a3', 1]], 'unrealized_gain': -297}], ['control 2', {'bid': [8, 8], 'ask': [9, 8], 'accounts': [['a0', 'asset', False, 101, 101], ['a1', 'asset', False, 5, 500]]}, {'balances': [['a0', 101], ['a1', 500]], 'unrealized_gain': 0}], ['control 3', {'bid': [7, 10], 'ask': [9, 10], 'accounts': [['a0', 'asset', False, 250, 500], ['a1', 'asset', True, 250, 250], ['a2', 'asset', False, 7, 14]]}, {'balances': [['a0', 500], ['a1', 175], ['a2', 14]], 'unrealized_gain': -75}], ['control 4', {'bid': [15, 10], 'ask': [18, 10], 'accounts': [['a0', 'asset', True, 5, 5], ['a1', 'liability', False, 250, 250], ['a2', 'liability', False, 250, 500], ['a3', 'liability', False, 7, 500]]}, {'balances': [['a0', 8], ['a1', 250], ['a2', 500], ['a3', 500]], 'unrealized_gain': 3}], ['control 5', {'bid': [5, 2], 'ask': [8, 2], 'accounts': [['a0', 'asset', True, 999, 1998], ['a1', 'asset', True, 250, 250], ['a2', 'asset', True, 999, 999]]}, {'balances': [['a0', 2498], ['a1', 625], ['a2', 2498]], 'unrealized_gain': 2374}], ['control 6', {'bid': [4, 2], 'ask': [5, 2], 'accounts': [['a0', 'asset', True, 5, 10], ['a1', 'asset', False, 1, 1]]}, {'balances': [['a0', 10], ['a1', 1]], 'unrealized_gain': 0}]], [['regression: bid and ask selection', {'bid': [130, 100], 'ask': [131, 100], 'accounts': [['a0', 'asset', False, 3, 6], ['a1', 'liability', True, 250, 253]]}, {'balances': [['a0', 6], ['a1', 328]], 'unrealized_gain': -75}], ['control 1', {'bid': [158, 100], 'ask': [159, 100], 'accounts': [['a0', 'liability', True, 1, 1], ['a1', 'asset', False, 999, 1002], ['a2', 'liability', True, 1, 2], ['a3', 'liability', False, 1000, 1003]]}, {'balances': [['a0', 2], ['a1', 1002], ['a2', 2], ['a3', 1003]], 'unrealized_gain': -1}], ['control 2', {'bid': [2, 4], 'ask': [3, 4], 'accounts': [['a0', 'asset', True, 5, 500], ['a1', 'asset', True, 5, 500], ['a2', 'asset', True, 5, 8], ['a3', 'asset', True, 3, 500]]}, {'balances': [['a0', 3], ['a1', 3], ['a2', 3], ['a3', 2]], 'unrealized_gain': -1497}], ['control 3', {'bid': [6, 4], 'ask': [7, 4], 'accounts': [['a0', 'asset', False, 999, 500], ['a1', 'asset', True, 999, 999], ['a2', 'asset', True, 101, 104]]}, {'balances': [['a0', 500], ['a1', 1499], ['a2', 152]], 'unrealized_gain': 548}], ['control 4', {'bid': [4, 2], 'ask': [7, 2], 'accounts': [['a0', 'asset', True, 1, 4], ['a1', 'asset', True, 101, 101]]}, {'balances': [['a0', 2], ['a1', 202]], 'unrealized_gain': 99}], ['control 5', {'bid': [9, 4], 'ask': [11, 4], 'accounts': [['a0', 'asset', True, 7, 14], ['a1', 'asset', True, 3, 6], ['a2', 'asset', True, 3, 6], ['a3', 'asset', False, 250, 253]]}, {'balances': [['a0', 16], ['a1', 7], ['a2', 7], ['a3', 253]], 'unrealized_gain': 4}], ['control 6', {'bid': [2, 2], 'ask': [5, 2], 'accounts': [['a0', 'asset', False, 7, 7], ['a1', 'liability', False, 101, 500]]}, {'balances': [['a0', 7], ['a1', 500]], 'unrealized_gain': 0}]]]\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":"627ef740ad83c347132b532e84fa040adc1d0a1e8182d784749f97aac8e9b68a","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(x):\n    def to_home(amount, rate):\n        num, den = rate\n        q, r = divmod(amount * num, den)\n        return q + (1 if 2 * r >= den else 0)\n    gain = 0\n    out = []\n    for name, kind, monetary, foreign, carried in x['accounts']:\n        if not monetary:\n            out.append([name, carried])\n            continue\n        rate = x['bid']\n        new = to_home(foreign, rate)\n        delta = new - carried\n        gain += delta if kind == 'asset' else -delta\n        out.append([name, new])\n    return {'balances': out, 'unrealized_gain': gain}\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = [[['regression: bid and ask selection', {'bid': [9, 8], 'ask': [12, 8], 'accounts': [['a0', 'liability', True, 5, 10], ['a1', 'asset', True, 101, 101], ['a2', 'asset', True, 7, 7], ['a3', 'asset', False, 250, 500]]}, {'balances': [['a0', 8], ['a1', 114], ['a2', 8], ['a3', 500]], 'unrealized_gain': 16}], ['control 1', {'bid': [124, 100], 'ask': [125, 100], 'accounts': [['a0', 'liability', True, 7, 14], ['a1', 'liability', False, 7, 7], ['a2', 'liability', True, 5, 8]]}, {'balances': [['a0', 9], ['a1', 7], ['a2', 6]], 'unrealized_gain': 7}], ['control 2', {'bid': [3, 4], 'ask': [4, 4], 'accounts': [['a0', 'asset', True, 7, 10], ['a1', 'asset', False, 7, 500]]}, {'balances': [['a0', 5], ['a1', 500]], 'unrealized_gain': -5}], ['control 3', {'bid': [18, 10], 'ask': [19, 10], 'accounts': [['a0', 'asset', False, 999, 500], ['a1', 'liability', False, 999, 1002], ['a2', 'liability', True, 1, 500], ['a3', 'liability', True, 1, 500], ['a4', 'asset', False, 1000, 1003]]}, {'balances': [['a0', 500], ['a1', 1002], ['a2', 2], ['a3', 2], ['a4', 1003]], 'unrealized_gain': 996}], ['control 4', {'bid': [8, 4], 'ask': [11, 4], 'accounts': [['a0', 'asset', True, 1000, 1000], ['a1', 'asset', False, 7, 7], ['a2', 'asset', True, 250, 250], ['a3', 'liability', False, 5, 8], ['a4', 'liability', False, 1000, 1000]]}, {'balances': [['a0', 2000], ['a1', 7], ['a2', 500], ['a3', 8], ['a4', 1000]], 'unrealized_gain': 1250}], ['control 5', {'bid': [5, 8], 'ask': [6, 8], 'accounts': [['a0', 'asset', True, 101, 101], ['a1', 'asset', False, 1, 4]]}, {'balances': [['a0', 63], ['a1', 4]], 'unrealized_gain': -38}], ['control 6', {'bid': [1, 2], 'ask': [2, 2], 'accounts': [['a0', 'asset', True, 999, 1998], ['a1', 'liability', False, 999, 999], ['a2', 'asset', True, 250, 500]]}, {'balances': [['a0', 500], ['a1', 999], ['a2', 125]], 'unrealized_gain': -1873}]], [['regression: bid and ask selection', {'bid': [15, 8], 'ask': [17, 8], 'accounts': [['a0', 'liability', True, 999, 999], ['a1', 'liability', True, 101, 101], ['a2', 'asset', True, 7, 7], ['a3', 'liability', True, 101, 202]]}, {'balances': [['a0', 2123], ['a1', 215], ['a2', 13], ['a3', 215]], 'unrealized_gain': -1245}], ['control 1', {'bid': [133, 100], 'ask': [135, 100], 'accounts': [['a0', 'liability', False, 3, 6], ['a1', 'asset', True, 1, 1], ['a2', 'liability', True, 7, 500], ['a3', 'liability', True, 3, 6]]}, {'balances': [['a0', 6], ['a1', 1], ['a2', 9], ['a3', 4]], 'unrealized_gain': 493}], ['control 2', {'bid': [119, 100], 'ask': [120, 100], 'accounts': [['a0', 'asset', False, 5, 500], ['a1', 'liability', False, 999, 500]]}, {'balances': [['a0', 500], ['a1', 500]], 'unrealized_gain': 0}], ['control 3', {'bid': [188, 100], 'ask': [189, 100], 'accounts': [['a0', 'asset', False, 1000, 1000], ['a1', 'asset', False, 1000, 1000], ['a2', 'asset', False, 5, 5], ['a3', 'asset', True, 1000, 1003]]}, {'balances': [['a0', 1000], ['a1', 1000], ['a2', 5], ['a3', 1880]], 'unrealized_gain': 877}], ['control 4', {'bid': [15, 8], 'ask': [16, 8], 'accounts': [['a0', 'asset', True, 999, 500], ['a1', 'asset', False, 3, 6], ['a2', 'asset', True, 999, 1998], ['a3', 'asset', True, 3, 3], ['a4', 'asset', True, 1, 4]]}, {'balances': [['a0', 1873], ['a1', 6], ['a2', 1873], ['a3', 6], ['a4', 2]], 'unrealized_gain': 1249}], ['control 5', {'bid': [4, 8], 'ask': [5, 8], 'accounts': [['a0', 'liability', False, 1, 2], ['a1', 'liability', True, 5, 500], ['a2', 'asset', True, 1, 4], ['a3', 'asset', True, 999, 1002], ['a4', 'liability', True, 5, 5]]}, {'balances': [['a0', 2], ['a1', 3], ['a2', 1], ['a3', 500], ['a4', 3]], 'unrealized_gain': -6}], ['control 6', {'bid': [3, 2], 'ask': [4, 2], 'accounts': [['a0', 'asset', True, 7, 500], ['a1', 'liability', True, 1, 1], ['a2', 'asset', True, 250, 500]]}, {'balances': [['a0', 11], ['a1', 2], ['a2', 375]], 'unrealized_gain': -615}]], [['regression: bid and ask selection', {'bid': [12, 10], 'ask': [14, 10], 'accounts': [['a0', 'asset', False, 1000, 2000], ['a1', 'liability', True, 1, 2], ['a2', 'liability', True, 3, 3], ['a3', 'liability', True, 999, 1002]]}, {'balances': [['a0', 2000], ['a1', 1], ['a2', 4], ['a3', 1399]], 'unrealized_gain': -397}], ['control 1', {'bid': [2, 2], 'ask': [3, 2], 'accounts': [['a0', 'asset', True, 3, 3], ['a1', 'asset', False, 5, 500], ['a2', 'asset', False, 999, 1998], ['a3', 'asset', True, 5, 5], ['a4', 'liability', False, 7, 14]]}, {'balances': [['a0', 3], ['a1', 500], ['a2', 1998], ['a3', 5], ['a4', 14]], 'unrealized_gain': 0}], ['control 2', {'bid': [130, 100], 'ask': [132, 100], 'accounts': [['a0', 'asset', True, 1, 4], ['a1', 'asset', True, 7, 500]]}, {'balances': [['a0', 1], ['a1', 9]], 'unrealized_gain': -494}], ['control 3', {'bid': [81, 100], 'ask': [83, 100], 'accounts': [['a0', 'asset', True, 1, 500], ['a1', 'asset', False, 1000, 500], ['a2', 'asset', True, 1000, 1003]]}, {'balances': [['a0', 1], ['a1', 500], ['a2', 810]], 'unrealized_gain': -692}], ['control 4', {'bid': [6, 4], 'ask': [7, 4], 'accounts': [['a0', 'liability', False, 999, 999], ['a1', 'asset', False, 999, 1002], ['a2', 'asset', True, 1, 4]]}, {'balances': [['a0', 999], ['a1', 1002], ['a2', 2]], 'unrealized_gain': -2}], ['control 5', {'bid': [12, 10], 'ask': [13, 10], 'accounts': [['a0', 'liability', False, 1000, 2000], ['a1', 'asset', True, 1000, 2000], ['a2', 'liability', True, 1, 2], ['a3', 'asset', True, 3, 500]]}, {'balances': [['a0', 2000], ['a1', 1200], ['a2', 1], ['a3', 4]], 'unrealized_gain': -1295}], ['control 6', {'bid': [9, 8], 'ask': [12, 8], 'accounts': [['a0', 'asset', True, 1, 500], ['a1', 'asset', True, 101, 500], ['a2', 'asset', True, 1000, 1003]]}, {'balances': [['a0', 1], ['a1', 114], ['a2', 1125]], 'unrealized_gain': -763}]], [['regression: bid and ask selection', {'bid': [3, 2], 'ask': [4, 2], 'accounts': [['a0', 'liability', True, 999, 500], ['a1', 'liability', False, 3, 3], ['a2', 'liability', True, 5, 10]]}, {'balances': [['a0', 1998], ['a1', 3], ['a2', 10]], 'unrealized_gain': -1498}], ['control 1', {'bid': [8, 10], 'ask': [9, 10], 'accounts': [['a0', 'liability', True, 1, 4], ['a1', 'asset', True, 250, 500], ['a2', 'asset', False, 101, 104], ['a3', 'asset', True, 1, 1]]}, {'balances': [['a0', 1], ['a1', 200], ['a2', 104], ['a3', 1]], 'unrealized_gain': -297}], ['control 2', {'bid': [8, 8], 'ask': [9, 8], 'accounts': [['a0', 'asset', False, 101, 101], ['a1', 'asset', False, 5, 500]]}, {'balances': [['a0', 101], ['a1', 500]], 'unrealized_gain': 0}], ['control 3', {'bid': [7, 10], 'ask': [9, 10], 'accounts': [['a0', 'asset', False, 250, 500], ['a1', 'asset', True, 250, 250], ['a2', 'asset', False, 7, 14]]}, {'balances': [['a0', 500], ['a1', 175], ['a2', 14]], 'unrealized_gain': -75}], ['control 4', {'bid': [15, 10], 'ask': [18, 10], 'accounts': [['a0', 'asset', True, 5, 5], ['a1', 'liability', False, 250, 250], ['a2', 'liability', False, 250, 500], ['a3', 'liability', False, 7, 500]]}, {'balances': [['a0', 8], ['a1', 250], ['a2', 500], ['a3', 500]], 'unrealized_gain': 3}], ['control 5', {'bid': [5, 2], 'ask': [8, 2], 'accounts': [['a0', 'asset', True, 999, 1998], ['a1', 'asset', True, 250, 250], ['a2', 'asset', True, 999, 999]]}, {'balances': [['a0', 2498], ['a1', 625], ['a2', 2498]], 'unrealized_gain': 2374}], ['control 6', {'bid': [4, 2], 'ask': [5, 2], 'accounts': [['a0', 'asset', True, 5, 10], ['a1', 'asset', False, 1, 1]]}, {'balances': [['a0', 10], ['a1', 1]], 'unrealized_gain': 0}]], [['regression: bid and ask selection', {'bid': [130, 100], 'ask': [131, 100], 'accounts': [['a0', 'asset', False, 3, 6], ['a1', 'liability', True, 250, 253]]}, {'balances': [['a0', 6], ['a1', 328]], 'unrealized_gain': -75}], ['control 1', {'bid': [158, 100], 'ask': [159, 100], 'accounts': [['a0', 'liability', True, 1, 1], ['a1', 'asset', False, 999, 1002], ['a2', 'liability', True, 1, 2], ['a3', 'liability', False, 1000, 1003]]}, {'balances': [['a0', 2], ['a1', 1002], ['a2', 2], ['a3', 1003]], 'unrealized_gain': -1}], ['control 2', {'bid': [2, 4], 'ask': [3, 4], 'accounts': [['a0', 'asset', True, 5, 500], ['a1', 'asset', True, 5, 500], ['a2', 'asset', True, 5, 8], ['a3', 'asset', True, 3, 500]]}, {'balances': [['a0', 3], ['a1', 3], ['a2', 3], ['a3', 2]], 'unrealized_gain': -1497}], ['control 3', {'bid': [6, 4], 'ask': [7, 4], 'accounts': [['a0', 'asset', False, 999, 500], ['a1', 'asset', True, 999, 999], ['a2', 'asset', True, 101, 104]]}, {'balances': [['a0', 500], ['a1', 1499], ['a2', 152]], 'unrealized_gain': 548}], ['control 4', {'bid': [4, 2], 'ask': [7, 2], 'accounts': [['a0', 'asset', True, 1, 4], ['a1', 'asset', True, 101, 101]]}, {'balances': [['a0', 2], ['a1', 202]], 'unrealized_gain': 99}], ['control 5', {'bid': [9, 4], 'ask': [11, 4], 'accounts': [['a0', 'asset', True, 7, 14], ['a1', 'asset', True, 3, 6], ['a2', 'asset', True, 3, 6], ['a3', 'asset', False, 250, 253]]}, {'balances': [['a0', 16], ['a1', 7], ['a2', 7], ['a3', 253]], 'unrealized_gain': 4}], ['control 6', {'bid': [2, 2], 'ask': [5, 2], 'accounts': [['a0', 'asset', False, 7, 7], ['a1', 'liability', False, 101, 500]]}, {'balances': [['a0', 7], ['a1', 500]], 'unrealized_gain': 0}]]]\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"},"fixed":{"sha256":"2b47e9339267a19b03649ea7df2f6264d719b00757cf7729d26837a2e2b7eae7","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(x):\n    def to_home(amount, rate):\n        num, den = rate\n        q, r = divmod(amount * num, den)\n        return q + (1 if 2 * r >= den else 0)\n    gain = 0\n    out = []\n    for name, kind, monetary, foreign, carried in x['accounts']:\n        if not monetary:\n            out.append([name, carried])\n            continue\n        rate = x['bid'] if kind == 'asset' else x['ask']\n        new = to_home(foreign, rate)\n        delta = new - carried\n        gain += delta if kind == 'asset' else -delta\n        out.append([name, new])\n    return {'balances': out, 'unrealized_gain': gain}\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = [[['regression: bid and ask selection', {'bid': [9, 8], 'ask': [12, 8], 'accounts': [['a0', 'liability', True, 5, 10], ['a1', 'asset', True, 101, 101], ['a2', 'asset', True, 7, 7], ['a3', 'asset', False, 250, 500]]}, {'balances': [['a0', 8], ['a1', 114], ['a2', 8], ['a3', 500]], 'unrealized_gain': 16}], ['control 1', {'bid': [124, 100], 'ask': [125, 100], 'accounts': [['a0', 'liability', True, 7, 14], ['a1', 'liability', False, 7, 7], ['a2', 'liability', True, 5, 8]]}, {'balances': [['a0', 9], ['a1', 7], ['a2', 6]], 'unrealized_gain': 7}], ['control 2', {'bid': [3, 4], 'ask': [4, 4], 'accounts': [['a0', 'asset', True, 7, 10], ['a1', 'asset', False, 7, 500]]}, {'balances': [['a0', 5], ['a1', 500]], 'unrealized_gain': -5}], ['control 3', {'bid': [18, 10], 'ask': [19, 10], 'accounts': [['a0', 'asset', False, 999, 500], ['a1', 'liability', False, 999, 1002], ['a2', 'liability', True, 1, 500], ['a3', 'liability', True, 1, 500], ['a4', 'asset', False, 1000, 1003]]}, {'balances': [['a0', 500], ['a1', 1002], ['a2', 2], ['a3', 2], ['a4', 1003]], 'unrealized_gain': 996}], ['control 4', {'bid': [8, 4], 'ask': [11, 4], 'accounts': [['a0', 'asset', True, 1000, 1000], ['a1', 'asset', False, 7, 7], ['a2', 'asset', True, 250, 250], ['a3', 'liability', False, 5, 8], ['a4', 'liability', False, 1000, 1000]]}, {'balances': [['a0', 2000], ['a1', 7], ['a2', 500], ['a3', 8], ['a4', 1000]], 'unrealized_gain': 1250}], ['control 5', {'bid': [5, 8], 'ask': [6, 8], 'accounts': [['a0', 'asset', True, 101, 101], ['a1', 'asset', False, 1, 4]]}, {'balances': [['a0', 63], ['a1', 4]], 'unrealized_gain': -38}], ['control 6', {'bid': [1, 2], 'ask': [2, 2], 'accounts': [['a0', 'asset', True, 999, 1998], ['a1', 'liability', False, 999, 999], ['a2', 'asset', True, 250, 500]]}, {'balances': [['a0', 500], ['a1', 999], ['a2', 125]], 'unrealized_gain': -1873}]], [['regression: bid and ask selection', {'bid': [15, 8], 'ask': [17, 8], 'accounts': [['a0', 'liability', True, 999, 999], ['a1', 'liability', True, 101, 101], ['a2', 'asset', True, 7, 7], ['a3', 'liability', True, 101, 202]]}, {'balances': [['a0', 2123], ['a1', 215], ['a2', 13], ['a3', 215]], 'unrealized_gain': -1245}], ['control 1', {'bid': [133, 100], 'ask': [135, 100], 'accounts': [['a0', 'liability', False, 3, 6], ['a1', 'asset', True, 1, 1], ['a2', 'liability', True, 7, 500], ['a3', 'liability', True, 3, 6]]}, {'balances': [['a0', 6], ['a1', 1], ['a2', 9], ['a3', 4]], 'unrealized_gain': 493}], ['control 2', {'bid': [119, 100], 'ask': [120, 100], 'accounts': [['a0', 'asset', False, 5, 500], ['a1', 'liability', False, 999, 500]]}, {'balances': [['a0', 500], ['a1', 500]], 'unrealized_gain': 0}], ['control 3', {'bid': [188, 100], 'ask': [189, 100], 'accounts': [['a0', 'asset', False, 1000, 1000], ['a1', 'asset', False, 1000, 1000], ['a2', 'asset', False, 5, 5], ['a3', 'asset', True, 1000, 1003]]}, {'balances': [['a0', 1000], ['a1', 1000], ['a2', 5], ['a3', 1880]], 'unrealized_gain': 877}], ['control 4', {'bid': [15, 8], 'ask': [16, 8], 'accounts': [['a0', 'asset', True, 999, 500], ['a1', 'asset', False, 3, 6], ['a2', 'asset', True, 999, 1998], ['a3', 'asset', True, 3, 3], ['a4', 'asset', True, 1, 4]]}, {'balances': [['a0', 1873], ['a1', 6], ['a2', 1873], ['a3', 6], ['a4', 2]], 'unrealized_gain': 1249}], ['control 5', {'bid': [4, 8], 'ask': [5, 8], 'accounts': [['a0', 'liability', False, 1, 2], ['a1', 'liability', True, 5, 500], ['a2', 'asset', True, 1, 4], ['a3', 'asset', True, 999, 1002], ['a4', 'liability', True, 5, 5]]}, {'balances': [['a0', 2], ['a1', 3], ['a2', 1], ['a3', 500], ['a4', 3]], 'unrealized_gain': -6}], ['control 6', {'bid': [3, 2], 'ask': [4, 2], 'accounts': [['a0', 'asset', True, 7, 500], ['a1', 'liability', True, 1, 1], ['a2', 'asset', True, 250, 500]]}, {'balances': [['a0', 11], ['a1', 2], ['a2', 375]], 'unrealized_gain': -615}]], [['regression: bid and ask selection', {'bid': [12, 10], 'ask': [14, 10], 'accounts': [['a0', 'asset', False, 1000, 2000], ['a1', 'liability', True, 1, 2], ['a2', 'liability', True, 3, 3], ['a3', 'liability', True, 999, 1002]]}, {'balances': [['a0', 2000], ['a1', 1], ['a2', 4], ['a3', 1399]], 'unrealized_gain': -397}], ['control 1', {'bid': [2, 2], 'ask': [3, 2], 'accounts': [['a0', 'asset', True, 3, 3], ['a1', 'asset', False, 5, 500], ['a2', 'asset', False, 999, 1998], ['a3', 'asset', True, 5, 5], ['a4', 'liability', False, 7, 14]]}, {'balances': [['a0', 3], ['a1', 500], ['a2', 1998], ['a3', 5], ['a4', 14]], 'unrealized_gain': 0}], ['control 2', {'bid': [130, 100], 'ask': [132, 100], 'accounts': [['a0', 'asset', True, 1, 4], ['a1', 'asset', True, 7, 500]]}, {'balances': [['a0', 1], ['a1', 9]], 'unrealized_gain': -494}], ['control 3', {'bid': [81, 100], 'ask': [83, 100], 'accounts': [['a0', 'asset', True, 1, 500], ['a1', 'asset', False, 1000, 500], ['a2', 'asset', True, 1000, 1003]]}, {'balances': [['a0', 1], ['a1', 500], ['a2', 810]], 'unrealized_gain': -692}], ['control 4', {'bid': [6, 4], 'ask': [7, 4], 'accounts': [['a0', 'liability', False, 999, 999], ['a1', 'asset', False, 999, 1002], ['a2', 'asset', True, 1, 4]]}, {'balances': [['a0', 999], ['a1', 1002], ['a2', 2]], 'unrealized_gain': -2}], ['control 5', {'bid': [12, 10], 'ask': [13, 10], 'accounts': [['a0', 'liability', False, 1000, 2000], ['a1', 'asset', True, 1000, 2000], ['a2', 'liability', True, 1, 2], ['a3', 'asset', True, 3, 500]]}, {'balances': [['a0', 2000], ['a1', 1200], ['a2', 1], ['a3', 4]], 'unrealized_gain': -1295}], ['control 6', {'bid': [9, 8], 'ask': [12, 8], 'accounts': [['a0', 'asset', True, 1, 500], ['a1', 'asset', True, 101, 500], ['a2', 'asset', True, 1000, 1003]]}, {'balances': [['a0', 1], ['a1', 114], ['a2', 1125]], 'unrealized_gain': -763}]], [['regression: bid and ask selection', {'bid': [3, 2], 'ask': [4, 2], 'accounts': [['a0', 'liability', True, 999, 500], ['a1', 'liability', False, 3, 3], ['a2', 'liability', True, 5, 10]]}, {'balances': [['a0', 1998], ['a1', 3], ['a2', 10]], 'unrealized_gain': -1498}], ['control 1', {'bid': [8, 10], 'ask': [9, 10], 'accounts': [['a0', 'liability', True, 1, 4], ['a1', 'asset', True, 250, 500], ['a2', 'asset', False, 101, 104], ['a3', 'asset', True, 1, 1]]}, {'balances': [['a0', 1], ['a1', 200], ['a2', 104], ['a3', 1]], 'unrealized_gain': -297}], ['control 2', {'bid': [8, 8], 'ask': [9, 8], 'accounts': [['a0', 'asset', False, 101, 101], ['a1', 'asset', False, 5, 500]]}, {'balances': [['a0', 101], ['a1', 500]], 'unrealized_gain': 0}], ['control 3', {'bid': [7, 10], 'ask': [9, 10], 'accounts': [['a0', 'asset', False, 250, 500], ['a1', 'asset', True, 250, 250], ['a2', 'asset', False, 7, 14]]}, {'balances': [['a0', 500], ['a1', 175], ['a2', 14]], 'unrealized_gain': -75}], ['control 4', {'bid': [15, 10], 'ask': [18, 10], 'accounts': [['a0', 'asset', True, 5, 5], ['a1', 'liability', False, 250, 250], ['a2', 'liability', False, 250, 500], ['a3', 'liability', False, 7, 500]]}, {'balances': [['a0', 8], ['a1', 250], ['a2', 500], ['a3', 500]], 'unrealized_gain': 3}], ['control 5', {'bid': [5, 2], 'ask': [8, 2], 'accounts': [['a0', 'asset', True, 999, 1998], ['a1', 'asset', True, 250, 250], ['a2', 'asset', True, 999, 999]]}, {'balances': [['a0', 2498], ['a1', 625], ['a2', 2498]], 'unrealized_gain': 2374}], ['control 6', {'bid': [4, 2], 'ask': [5, 2], 'accounts': [['a0', 'asset', True, 5, 10], ['a1', 'asset', False, 1, 1]]}, {'balances': [['a0', 10], ['a1', 1]], 'unrealized_gain': 0}]], [['regression: bid and ask selection', {'bid': [130, 100], 'ask': [131, 100], 'accounts': [['a0', 'asset', False, 3, 6], ['a1', 'liability', True, 250, 253]]}, {'balances': [['a0', 6], ['a1', 328]], 'unrealized_gain': -75}], ['control 1', {'bid': [158, 100], 'ask': [159, 100], 'accounts': [['a0', 'liability', True, 1, 1], ['a1', 'asset', False, 999, 1002], ['a2', 'liability', True, 1, 2], ['a3', 'liability', False, 1000, 1003]]}, {'balances': [['a0', 2], ['a1', 1002], ['a2', 2], ['a3', 1003]], 'unrealized_gain': -1}], ['control 2', {'bid': [2, 4], 'ask': [3, 4], 'accounts': [['a0', 'asset', True, 5, 500], ['a1', 'asset', True, 5, 500], ['a2', 'asset', True, 5, 8], ['a3', 'asset', True, 3, 500]]}, {'balances': [['a0', 3], ['a1', 3], ['a2', 3], ['a3', 2]], 'unrealized_gain': -1497}], ['control 3', {'bid': [6, 4], 'ask': [7, 4], 'accounts': [['a0', 'asset', False, 999, 500], ['a1', 'asset', True, 999, 999], ['a2', 'asset', True, 101, 104]]}, {'balances': [['a0', 500], ['a1', 1499], ['a2', 152]], 'unrealized_gain': 548}], ['control 4', {'bid': [4, 2], 'ask': [7, 2], 'accounts': [['a0', 'asset', True, 1, 4], ['a1', 'asset', True, 101, 101]]}, {'balances': [['a0', 2], ['a1', 202]], 'unrealized_gain': 99}], ['control 5', {'bid': [9, 4], 'ask': [11, 4], 'accounts': [['a0', 'asset', True, 7, 14], ['a1', 'asset', True, 3, 6], ['a2', 'asset', True, 3, 6], ['a3', 'asset', False, 250, 253]]}, {'balances': [['a0', 16], ['a1', 7], ['a2', 7], ['a3', 253]], 'unrealized_gain': 4}], ['control 6', {'bid': [2, 2], 'ask': [5, 2], 'accounts': [['a0', 'asset', False, 7, 7], ['a1', 'liability', False, 101, 500]]}, {'balances': [['a0', 7], ['a1', 500]], 'unrealized_gain': 0}]]]\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 bookkeeping rules stated in the contract; amounts are integer cents; it makes no claim of conformance to any accounting 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-double-entry-ledger-accounting-fx-revaluation-bid-and-ask-selection","generated_at":"2026-09-29T14:46:22.511876+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"Ledger software must keep debits equal to credits and apply normal-balance, period and cutoff rules exactly; small sign or boundary slips silently misstate financial statements.","repair":"Use bid for monetary assets and ask for monetary liabilities.","root_cause":"Liabilities are remeasured at the bid rate instead of the ask rate.","sha256":"a3d88ace40a71a24a9929789bfafc9c1e670e2ed512852b58787c1832d55bd45","title":"Foreign currency period-end revaluation: bid and ask selection · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verification":{"attempt":{"elapsed_ms":43.573,"exit_code":1,"observations":[{"actual":{"balances":[["a0",6],["a1",152],["a2",11],["a3",500]],"unrealized_gain":59},"check":"regression: bid and ask selection","expected":{"balances":[["a0",8],["a1",114],["a2",8],["a3",500]],"unrealized_gain":16},"passed":false},{"actual":{"balances":[["a0",9],["a1",7],["a2",6]],"unrealized_gain":7},"check":"control 1","expected":{"balances":[["a0",9],["a1",7],["a2",6]],"unrealized_gain":7},"passed":true},{"actual":{"balances":[["a0",7],["a1",500]],"unrealized_gain":-3},"check":"control 2","expected":{"balances":[["a0",5],["a1",500]],"unrealized_gain":-5},"passed":false},{"actual":{"balances":[["a0",500],["a1",1002],["a2",2],["a3",2],["a4",1003]],"unrealized_gain":996},"check":"control 3","expected":{"balances":[["a0",500],["a1",1002],["a2",2],["a3",2],["a4",1003]],"unrealized_gain":996},"passed":true},{"actual":{"balances":[["a0",2750],["a1",7],["a2",688],["a3",8],["a4",1000]],"unrealized_gain":2188},"check":"control 4","expected":{"balances":[["a0",2000],["a1",7],["a2",500],["a3",8],["a4",1000]],"unrealized_gain":1250},"passed":false},{"actual":{"balances":[["a0",76],["a1",4]],"unrealized_gain":-25},"check":"control 5","expected":{"balances":[["a0",63],["a1",4]],"unrealized_gain":-38},"passed":false},{"actual":{"balances":[["a0",999],["a1",999],["a2",250]],"unrealized_gain":-1249},"check":"control 6","expected":{"balances":[["a0",500],["a1",999],["a2",125]],"unrealized_gain":-1873},"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"regression: bid and ask selection\", \"actual\": {\"balances\": [[\"a0\", 6], [\"a1\", 152], [\"a2\", 11], [\"a3\", 500]], \"unrealized_gain\": 59}, \"expected\": {\"balances\": [[\"a0\", 8], [\"a1\", 114], [\"a2\", 8], [\"a3\", 500]], \"unrealized_gain\": 16}, \"passed\": false}, {\"check\": \"control 1\", \"actual\": {\"balances\": [[\"a0\", 9], [\"a1\", 7], [\"a2\", 6]], \"unrealized_gain\": 7}, \"expected\": {\"balances\": [[\"a0\", 9], [\"a1\", 7], [\"a2\", 6]], \"unrealized_gain\": 7}, \"passed\": true}, {\"check\": \"control 2\", \"actual\": {\"balances\": [[\"a0\", 7], [\"a1\", 500]], \"unrealized_gain\": -3}, \"expected\": {\"balances\": [[\"a0\", 5], [\"a1\", 500]], \"unrealized_gain\": -5}, \"passed\": false}, {\"check\": \"control 3\", \"actual\": {\"balances\": [[\"a0\", 500], [\"a1\", 1002], [\"a2\", 2], [\"a3\", 2], [\"a4\", 1003]], \"unrealized_gain\": 996}, \"expected\": {\"balances\": [[\"a0\", 500], [\"a1\", 1002], [\"a2\", 2], [\"a3\", 2], [\"a4\", 1003]], \"unrealized_gain\": 996}, \"passed\": true}, {\"check\": \"control 4\", \"actual\": {\"balances\": [[\"a0\", 2750], [\"a1\", 7], [\"a2\", 688], [\"a3\", 8], [\"a4\", 1000]], \"unrealized_gain\": 2188}, 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