{"abstract":"A bond issued less than 15 days before maturity reports an empty coupon schedule.","category":"Bond day-count conventions","checks":8,"contract":"Inputs issue and maturity [y,m,d], months per period and an end-of-month flag. Unadjusted coupon dates are generated backward from maturity: the k-th date is maturity shifted back k*months calendar months, keeping the maturity day clamped to the month length; if the flag is set and maturity is the last day of its month, every date is the last day of its month. Dates on or before issue are dropped. If more than one date remains and the first is fewer than 15 days after issue, it is removed (long first coupon). Return the dates ascending.","evaluation_group":"w2-bond_day_count_conventions-backward-coupon-schedule","failed_approach":"Restoring the guard but testing 15 days inclusively removes stubs of exactly 15 days.","family":"w2-bond_day_count_conventions-backward-coupon-schedule-single-coupon-stub-guard","id":"FA-60966","implementations":{"attempt":{"sha256":"9d719ff2e4afa670bb3dff435560f80021ab3f386c673719246d609be3019dc9","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nimport datetime\nfrom fractions import Fraction\nN = 1\nobservations = []\ndef solve(issue, maturity, months, eom):\n    def mlen(y, m):\n        if m == 2:\n            return 29 if (y % 4 == 0 and y % 100 != 0) or y % 400 == 0 else 28\n        return 30 if m in (4, 6, 9, 11) else 31\n    def shift(y, m, k):\n        t = y * 12 + (m - 1) - k\n        return t // 12, t % 12 + 1\n    I = datetime.date(*issue)\n    my, mm, md = maturity\n    end_eom = md == mlen(my, mm)\n    out = []\n    k = 0\n    while True:\n        y, m = shift(my, mm, k * months)\n        d = mlen(y, m) if (eom and end_eom) else min(md, mlen(y, m))\n        if datetime.date(y, m, d) <= I:\n            break\n        out.append([y, m, d])\n        k += 1\n    out.reverse()\n    if len(out) > 1 and (datetime.date(*out[0]) - I).days <= 15:\n        out.pop(0)\n    return out\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = [[['regression single coupon stub guard 1', [[2036, 12, 26], [2036, 12, 31], 1, True], [[2036, 12, 31]]], ['regression single coupon stub guard 2', [[2024, 3, 18], [2024, 3, 31], 12, True], [[2024, 3, 31]]], ['partial repair probe 1', [[2009, 12, 15], [2012, 9, 30], 3, False], [[2009, 12, 30], [2010, 3, 30], [2010, 6, 30], [2010, 9, 30], [2010, 12, 30], [2011, 3, 30], [2011, 6, 30], [2011, 9, 30], [2011, 12, 30], [2012, 3, 30], [2012, 6, 30], [2012, 9, 30]]], ['partial repair probe 2', [[2007, 7, 16], [2010, 1, 31], 6, False], [[2007, 7, 31], [2008, 1, 31], [2008, 7, 31], [2009, 1, 31], [2009, 7, 31], [2010, 1, 31]]], ['boundary control 1', [[2024, 3, 15], [2025, 3, 15], 3, False], [[2024, 6, 15], [2024, 9, 15], [2024, 12, 15], [2025, 3, 15]]], ['boundary control 2', [[2024, 1, 10], [2025, 8, 31], 6, False], [[2024, 2, 29], [2024, 8, 31], [2025, 2, 28], [2025, 8, 31]]], ['normal control 1', [[2025, 3, 31], [2028, 12, 31], 6, True], [[2025, 6, 30], [2025, 12, 31], [2026, 6, 30], [2026, 12, 31], [2027, 6, 30], [2027, 12, 31], [2028, 6, 30], [2028, 12, 31]]], ['normal control 2', [[2018, 12, 30], [2020, 6, 30], 3, False], [[2019, 3, 30], [2019, 6, 30], [2019, 9, 30], [2019, 12, 30], [2020, 3, 30], [2020, 6, 30]]]], [['regression single coupon stub guard 1', [[2008, 8, 29], [2008, 8, 31], 6, False], [[2008, 8, 31]]], ['regression single coupon stub guard 2', [[2010, 9, 28], [2010, 9, 30], 6, False], [[2010, 9, 30]]], ['partial repair probe 1', [[2007, 2, 13], [2011, 1, 30], 1, True], [[2007, 2, 28], [2007, 3, 30], [2007, 4, 30], [2007, 5, 30], [2007, 6, 30], [2007, 7, 30], [2007, 8, 30], [2007, 9, 30], [2007, 10, 30], [2007, 11, 30], [2007, 12, 30], [2008, 1, 30], [2008, 2, 29], [2008, 3, 30], [2008, 4, 30], [2008, 5, 30], [2008, 6, 30], [2008, 7, 30], [2008, 8, 30], [2008, 9, 30], [2008, 10, 30], [2008, 11, 30], [2008, 12, 30], [2009, 1, 30], [2009, 2, 28], [2009, 3, 30], [2009, 4, 30], [2009, 5, 30], [2009, 6, 30], [2009, 7, 30], [2009, 8, 30], [2009, 9, 30], [2009, 10, 30], [2009, 11, 30], [2009, 12, 30], [2010, 1, 30], [2010, 2, 28], [2010, 3, 30], [2010, 4, 30], [2010, 5, 30], [2010, 6, 30], [2010, 7, 30], [2010, 8, 30], [2010, 9, 30], [2010, 10, 30], [2010, 11, 30], [2010, 12, 30], [2011, 1, 30]]], ['partial repair probe 2', [[2002, 6, 15], [2003, 6, 30], 12, True], [[2002, 6, 30], [2003, 6, 30]]], ['boundary control 1', [[2024, 2, 20], [2025, 2, 28], 6, True], [[2024, 8, 31], [2025, 2, 28]]], ['boundary control 2', [[2024, 3, 1], [2025, 3, 15], 6, False], [[2024, 9, 15], [2025, 3, 15]]], ['normal control 1', [[2024, 8, 1], [2025, 4, 30], 1, False], [[2024, 8, 30], [2024, 9, 30], [2024, 10, 30], [2024, 11, 30], [2024, 12, 30], [2025, 1, 30], [2025, 2, 28], [2025, 3, 30], [2025, 4, 30]]], ['normal control 2', [[2038, 4, 15], [2038, 4, 30], 3, False], [[2038, 4, 30]]]], [['regression single coupon stub guard 1', [[2005, 4, 2], [2005, 4, 10], 12, True], [[2005, 4, 10]]], ['regression single coupon stub guard 2', [[2027, 8, 22], [2027, 8, 31], 6, False], [[2027, 8, 31]]], ['partial repair probe 1', [[2001, 11, 15], [2003, 10, 31], 1, False], [[2001, 11, 30], [2001, 12, 31], [2002, 1, 31], [2002, 2, 28], [2002, 3, 31], [2002, 4, 30], [2002, 5, 31], [2002, 6, 30], [2002, 7, 31], [2002, 8, 31], [2002, 9, 30], [2002, 10, 31], [2002, 11, 30], [2002, 12, 31], [2003, 1, 31], [2003, 2, 28], [2003, 3, 31], [2003, 4, 30], [2003, 5, 31], [2003, 6, 30], [2003, 7, 31], [2003, 8, 31], [2003, 9, 30], [2003, 10, 31]]], ['partial repair probe 2', [[2019, 6, 11], [2020, 3, 26], 1, True], [[2019, 6, 26], [2019, 7, 26], [2019, 8, 26], [2019, 9, 26], [2019, 10, 26], [2019, 11, 26], [2019, 12, 26], [2020, 1, 26], [2020, 2, 26], [2020, 3, 26]]], ['boundary control 1', [[2024, 1, 10], [2025, 8, 31], 6, False], [[2024, 2, 29], [2024, 8, 31], [2025, 2, 28], [2025, 8, 31]]], ['boundary control 2', [[2024, 1, 10], [2025, 8, 31], 6, True], [[2024, 2, 29], [2024, 8, 31], [2025, 2, 28], [2025, 8, 31]]], ['normal control 1', [[2000, 2, 20], [2003, 5, 30], 6, True], [[2000, 5, 30], [2000, 11, 30], [2001, 5, 30], [2001, 11, 30], [2002, 5, 30], [2002, 11, 30], [2003, 5, 30]]], ['normal control 2', [[2008, 9, 18], [2012, 9, 17], 6, True], [[2009, 3, 17], [2009, 9, 17], [2010, 3, 17], [2010, 9, 17], [2011, 3, 17], [2011, 9, 17], [2012, 3, 17], [2012, 9, 17]]]], [['regression single coupon stub guard 1', [[2025, 5, 29], [2025, 5, 30], 12, True], [[2025, 5, 30]]], ['regression single coupon stub guard 2', [[2037, 9, 17], [2037, 9, 30], 3, True], [[2037, 9, 30]]], ['partial repair probe 1', [[2011, 1, 19], [2014, 5, 3], 3, False], [[2011, 2, 3], [2011, 5, 3], [2011, 8, 3], [2011, 11, 3], [2012, 2, 3], [2012, 5, 3], [2012, 8, 3], [2012, 11, 3], [2013, 2, 3], [2013, 5, 3], [2013, 8, 3], [2013, 11, 3], [2014, 2, 3], [2014, 5, 3]]], ['partial repair probe 2', [[2040, 4, 15], [2040, 9, 30], 1, False], [[2040, 4, 30], [2040, 5, 30], [2040, 6, 30], [2040, 7, 30], [2040, 8, 30], [2040, 9, 30]]], ['boundary control 1', [[2024, 3, 1], [2025, 3, 15], 6, False], [[2024, 9, 15], [2025, 3, 15]]], ['boundary control 2', [[2024, 1, 10], [2025, 8, 31], 6, False], [[2024, 2, 29], [2024, 8, 31], [2025, 2, 28], [2025, 8, 31]]], ['normal control 1', [[2019, 8, 23], [2023, 5, 31], 6, True], [[2019, 11, 30], [2020, 5, 31], [2020, 11, 30], [2021, 5, 31], [2021, 11, 30], [2022, 5, 31], [2022, 11, 30], [2023, 5, 31]]], ['normal control 2', [[2010, 1, 1], [2011, 11, 30], 6, False], [[2010, 5, 30], [2010, 11, 30], [2011, 5, 30], [2011, 11, 30]]]], [['regression single coupon stub guard 1', [[2009, 2, 27], [2009, 2, 28], 1, False], [[2009, 2, 28]]], ['regression single coupon stub guard 2', [[2018, 5, 29], [2018, 5, 31], 1, True], [[2018, 5, 31]]], ['partial repair probe 1', [[2013, 8, 13], [2014, 11, 28], 3, True], [[2013, 8, 28], [2013, 11, 28], [2014, 2, 28], [2014, 5, 28], [2014, 8, 28], [2014, 11, 28]]], ['partial repair probe 2', [[2010, 7, 14], [2010, 10, 29], 1, False], [[2010, 7, 29], [2010, 8, 29], [2010, 9, 29], [2010, 10, 29]]], ['boundary control 1', [[2024, 1, 10], [2025, 8, 31], 6, True], [[2024, 2, 29], [2024, 8, 31], [2025, 2, 28], [2025, 8, 31]]], ['boundary control 2', [[2024, 3, 15], [2025, 3, 15], 3, False], [[2024, 6, 15], [2024, 9, 15], [2024, 12, 15], [2025, 3, 15]]], ['normal control 1', [[2038, 8, 19], [2040, 7, 31], 12, True], [[2039, 7, 31], [2040, 7, 31]]], ['normal control 2', [[2021, 11, 29], [2024, 4, 30], 6, False], [[2022, 4, 30], [2022, 10, 30], [2023, 4, 30], [2023, 10, 30], [2024, 4, 30]]]]]\nfor label, args, expected in fixtures[N-1]:\n    check(label, 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":"75072488a5cc1a30f7af7972d69e5fe451bd7c011a36e2706219ae3c02059c2f","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nimport datetime\nfrom fractions import Fraction\nN = 1\nobservations = []\ndef solve(issue, maturity, months, eom):\n    def mlen(y, m):\n        if m == 2:\n            return 29 if (y % 4 == 0 and y % 100 != 0) or y % 400 == 0 else 28\n        return 30 if m in (4, 6, 9, 11) else 31\n    def shift(y, m, k):\n        t = y * 12 + (m - 1) - k\n        return t // 12, t % 12 + 1\n    I = datetime.date(*issue)\n    my, mm, md = maturity\n    end_eom = md == mlen(my, mm)\n    out = []\n    k = 0\n    while True:\n        y, m = shift(my, mm, k * months)\n        d = mlen(y, m) if (eom and end_eom) else min(md, mlen(y, m))\n        if datetime.date(y, m, d) <= I:\n            break\n        out.append([y, m, d])\n        k += 1\n    out.reverse()\n    if out and (datetime.date(*out[0]) - I).days < 15:\n        out.pop(0)\n    return out\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = [[['regression single coupon stub guard 1', [[2036, 12, 26], [2036, 12, 31], 1, True], [[2036, 12, 31]]], ['regression single coupon stub guard 2', [[2024, 3, 18], [2024, 3, 31], 12, True], [[2024, 3, 31]]], ['partial repair probe 1', [[2009, 12, 15], [2012, 9, 30], 3, False], [[2009, 12, 30], [2010, 3, 30], [2010, 6, 30], [2010, 9, 30], [2010, 12, 30], [2011, 3, 30], [2011, 6, 30], [2011, 9, 30], [2011, 12, 30], [2012, 3, 30], [2012, 6, 30], [2012, 9, 30]]], ['partial repair probe 2', [[2007, 7, 16], [2010, 1, 31], 6, False], [[2007, 7, 31], [2008, 1, 31], [2008, 7, 31], [2009, 1, 31], [2009, 7, 31], [2010, 1, 31]]], ['boundary control 1', [[2024, 3, 15], [2025, 3, 15], 3, False], [[2024, 6, 15], [2024, 9, 15], [2024, 12, 15], [2025, 3, 15]]], ['boundary control 2', [[2024, 1, 10], [2025, 8, 31], 6, False], [[2024, 2, 29], [2024, 8, 31], [2025, 2, 28], [2025, 8, 31]]], ['normal control 1', [[2025, 3, 31], [2028, 12, 31], 6, True], [[2025, 6, 30], [2025, 12, 31], [2026, 6, 30], [2026, 12, 31], [2027, 6, 30], [2027, 12, 31], [2028, 6, 30], [2028, 12, 31]]], ['normal control 2', [[2018, 12, 30], [2020, 6, 30], 3, False], [[2019, 3, 30], [2019, 6, 30], [2019, 9, 30], [2019, 12, 30], [2020, 3, 30], [2020, 6, 30]]]], [['regression single coupon stub guard 1', [[2008, 8, 29], [2008, 8, 31], 6, False], [[2008, 8, 31]]], ['regression single coupon stub guard 2', [[2010, 9, 28], [2010, 9, 30], 6, False], [[2010, 9, 30]]], ['partial repair probe 1', [[2007, 2, 13], [2011, 1, 30], 1, True], [[2007, 2, 28], [2007, 3, 30], [2007, 4, 30], [2007, 5, 30], [2007, 6, 30], [2007, 7, 30], [2007, 8, 30], [2007, 9, 30], [2007, 10, 30], [2007, 11, 30], [2007, 12, 30], [2008, 1, 30], [2008, 2, 29], [2008, 3, 30], [2008, 4, 30], [2008, 5, 30], [2008, 6, 30], [2008, 7, 30], [2008, 8, 30], [2008, 9, 30], [2008, 10, 30], [2008, 11, 30], [2008, 12, 30], [2009, 1, 30], [2009, 2, 28], [2009, 3, 30], [2009, 4, 30], [2009, 5, 30], [2009, 6, 30], [2009, 7, 30], [2009, 8, 30], [2009, 9, 30], [2009, 10, 30], [2009, 11, 30], [2009, 12, 30], [2010, 1, 30], [2010, 2, 28], [2010, 3, 30], [2010, 4, 30], [2010, 5, 30], [2010, 6, 30], [2010, 7, 30], [2010, 8, 30], [2010, 9, 30], [2010, 10, 30], [2010, 11, 30], [2010, 12, 30], [2011, 1, 30]]], ['partial repair probe 2', [[2002, 6, 15], [2003, 6, 30], 12, True], [[2002, 6, 30], [2003, 6, 30]]], ['boundary control 1', [[2024, 2, 20], [2025, 2, 28], 6, True], [[2024, 8, 31], [2025, 2, 28]]], ['boundary control 2', [[2024, 3, 1], [2025, 3, 15], 6, False], [[2024, 9, 15], [2025, 3, 15]]], ['normal control 1', [[2024, 8, 1], [2025, 4, 30], 1, False], [[2024, 8, 30], [2024, 9, 30], [2024, 10, 30], [2024, 11, 30], [2024, 12, 30], [2025, 1, 30], [2025, 2, 28], [2025, 3, 30], [2025, 4, 30]]], ['normal control 2', [[2038, 4, 15], [2038, 4, 30], 3, False], [[2038, 4, 30]]]], [['regression single coupon stub guard 1', [[2005, 4, 2], [2005, 4, 10], 12, True], [[2005, 4, 10]]], ['regression single coupon stub guard 2', [[2027, 8, 22], [2027, 8, 31], 6, False], [[2027, 8, 31]]], ['partial repair probe 1', [[2001, 11, 15], [2003, 10, 31], 1, False], [[2001, 11, 30], [2001, 12, 31], [2002, 1, 31], [2002, 2, 28], [2002, 3, 31], [2002, 4, 30], [2002, 5, 31], [2002, 6, 30], [2002, 7, 31], [2002, 8, 31], [2002, 9, 30], [2002, 10, 31], [2002, 11, 30], [2002, 12, 31], [2003, 1, 31], [2003, 2, 28], [2003, 3, 31], [2003, 4, 30], [2003, 5, 31], [2003, 6, 30], [2003, 7, 31], [2003, 8, 31], [2003, 9, 30], [2003, 10, 31]]], ['partial repair probe 2', [[2019, 6, 11], [2020, 3, 26], 1, True], [[2019, 6, 26], [2019, 7, 26], [2019, 8, 26], [2019, 9, 26], [2019, 10, 26], [2019, 11, 26], [2019, 12, 26], [2020, 1, 26], [2020, 2, 26], [2020, 3, 26]]], ['boundary control 1', [[2024, 1, 10], [2025, 8, 31], 6, False], [[2024, 2, 29], [2024, 8, 31], [2025, 2, 28], [2025, 8, 31]]], ['boundary control 2', [[2024, 1, 10], [2025, 8, 31], 6, True], [[2024, 2, 29], [2024, 8, 31], [2025, 2, 28], [2025, 8, 31]]], ['normal control 1', [[2000, 2, 20], [2003, 5, 30], 6, True], [[2000, 5, 30], [2000, 11, 30], [2001, 5, 30], [2001, 11, 30], [2002, 5, 30], [2002, 11, 30], [2003, 5, 30]]], ['normal control 2', [[2008, 9, 18], [2012, 9, 17], 6, True], [[2009, 3, 17], [2009, 9, 17], [2010, 3, 17], [2010, 9, 17], [2011, 3, 17], [2011, 9, 17], [2012, 3, 17], [2012, 9, 17]]]], [['regression single coupon stub guard 1', [[2025, 5, 29], [2025, 5, 30], 12, True], [[2025, 5, 30]]], ['regression single coupon stub guard 2', [[2037, 9, 17], [2037, 9, 30], 3, True], [[2037, 9, 30]]], ['partial repair probe 1', [[2011, 1, 19], [2014, 5, 3], 3, False], [[2011, 2, 3], [2011, 5, 3], [2011, 8, 3], [2011, 11, 3], [2012, 2, 3], [2012, 5, 3], [2012, 8, 3], [2012, 11, 3], [2013, 2, 3], [2013, 5, 3], [2013, 8, 3], [2013, 11, 3], [2014, 2, 3], [2014, 5, 3]]], ['partial repair probe 2', [[2040, 4, 15], [2040, 9, 30], 1, False], [[2040, 4, 30], [2040, 5, 30], [2040, 6, 30], [2040, 7, 30], [2040, 8, 30], [2040, 9, 30]]], ['boundary control 1', [[2024, 3, 1], [2025, 3, 15], 6, False], [[2024, 9, 15], [2025, 3, 15]]], ['boundary control 2', [[2024, 1, 10], [2025, 8, 31], 6, False], [[2024, 2, 29], [2024, 8, 31], [2025, 2, 28], [2025, 8, 31]]], ['normal control 1', [[2019, 8, 23], [2023, 5, 31], 6, True], [[2019, 11, 30], [2020, 5, 31], [2020, 11, 30], [2021, 5, 31], [2021, 11, 30], [2022, 5, 31], [2022, 11, 30], [2023, 5, 31]]], ['normal control 2', [[2010, 1, 1], [2011, 11, 30], 6, False], [[2010, 5, 30], [2010, 11, 30], [2011, 5, 30], [2011, 11, 30]]]], [['regression single coupon stub guard 1', [[2009, 2, 27], [2009, 2, 28], 1, False], [[2009, 2, 28]]], ['regression single coupon stub guard 2', [[2018, 5, 29], [2018, 5, 31], 1, True], [[2018, 5, 31]]], ['partial repair probe 1', [[2013, 8, 13], [2014, 11, 28], 3, True], [[2013, 8, 28], [2013, 11, 28], [2014, 2, 28], [2014, 5, 28], [2014, 8, 28], [2014, 11, 28]]], ['partial repair probe 2', [[2010, 7, 14], [2010, 10, 29], 1, False], [[2010, 7, 29], [2010, 8, 29], [2010, 9, 29], [2010, 10, 29]]], ['boundary control 1', [[2024, 1, 10], [2025, 8, 31], 6, True], [[2024, 2, 29], [2024, 8, 31], [2025, 2, 28], [2025, 8, 31]]], ['boundary control 2', [[2024, 3, 15], [2025, 3, 15], 3, False], [[2024, 6, 15], [2024, 9, 15], [2024, 12, 15], [2025, 3, 15]]], ['normal control 1', [[2038, 8, 19], [2040, 7, 31], 12, True], [[2039, 7, 31], [2040, 7, 31]]], ['normal control 2', [[2021, 11, 29], [2024, 4, 30], 6, False], [[2022, 4, 30], [2022, 10, 30], [2023, 4, 30], [2023, 10, 30], [2024, 4, 30]]]]]\nfor label, args, expected in fixtures[N-1]:\n    check(label, 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"},"fixed":{"sha256":"6e7b40eb8c0282ff81d34d002115a7f5346b40d81ac06a71de4cc090a5e4c1d4","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nimport datetime\nfrom fractions import Fraction\nN = 1\nobservations = []\ndef solve(issue, maturity, months, eom):\n    def mlen(y, m):\n        if m == 2:\n            return 29 if (y % 4 == 0 and y % 100 != 0) or y % 400 == 0 else 28\n        return 30 if m in (4, 6, 9, 11) else 31\n    def shift(y, m, k):\n        t = y * 12 + (m - 1) - k\n        return t // 12, t % 12 + 1\n    I = datetime.date(*issue)\n    my, mm, md = maturity\n    end_eom = md == mlen(my, mm)\n    out = []\n    k = 0\n    while True:\n        y, m = shift(my, mm, k * months)\n        d = mlen(y, m) if (eom and end_eom) else min(md, mlen(y, m))\n        if datetime.date(y, m, d) <= I:\n            break\n        out.append([y, m, d])\n        k += 1\n    out.reverse()\n    if len(out) > 1 and (datetime.date(*out[0]) - I).days < 15:\n        out.pop(0)\n    return out\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = [[['regression single coupon stub guard 1', [[2036, 12, 26], [2036, 12, 31], 1, True], [[2036, 12, 31]]], ['regression single coupon stub guard 2', [[2024, 3, 18], [2024, 3, 31], 12, True], [[2024, 3, 31]]], ['partial repair probe 1', [[2009, 12, 15], [2012, 9, 30], 3, False], [[2009, 12, 30], [2010, 3, 30], [2010, 6, 30], [2010, 9, 30], [2010, 12, 30], [2011, 3, 30], [2011, 6, 30], [2011, 9, 30], [2011, 12, 30], [2012, 3, 30], [2012, 6, 30], [2012, 9, 30]]], ['partial repair probe 2', [[2007, 7, 16], [2010, 1, 31], 6, False], [[2007, 7, 31], [2008, 1, 31], [2008, 7, 31], [2009, 1, 31], [2009, 7, 31], [2010, 1, 31]]], ['boundary control 1', [[2024, 3, 15], [2025, 3, 15], 3, False], [[2024, 6, 15], [2024, 9, 15], [2024, 12, 15], [2025, 3, 15]]], ['boundary control 2', [[2024, 1, 10], [2025, 8, 31], 6, False], [[2024, 2, 29], [2024, 8, 31], [2025, 2, 28], [2025, 8, 31]]], ['normal control 1', [[2025, 3, 31], [2028, 12, 31], 6, True], [[2025, 6, 30], [2025, 12, 31], [2026, 6, 30], [2026, 12, 31], [2027, 6, 30], [2027, 12, 31], [2028, 6, 30], [2028, 12, 31]]], ['normal control 2', [[2018, 12, 30], [2020, 6, 30], 3, False], [[2019, 3, 30], [2019, 6, 30], [2019, 9, 30], [2019, 12, 30], [2020, 3, 30], [2020, 6, 30]]]], [['regression single coupon stub guard 1', [[2008, 8, 29], [2008, 8, 31], 6, False], [[2008, 8, 31]]], ['regression single coupon stub guard 2', [[2010, 9, 28], [2010, 9, 30], 6, False], [[2010, 9, 30]]], ['partial repair probe 1', [[2007, 2, 13], [2011, 1, 30], 1, True], [[2007, 2, 28], [2007, 3, 30], [2007, 4, 30], [2007, 5, 30], [2007, 6, 30], [2007, 7, 30], [2007, 8, 30], [2007, 9, 30], [2007, 10, 30], [2007, 11, 30], [2007, 12, 30], [2008, 1, 30], [2008, 2, 29], [2008, 3, 30], [2008, 4, 30], [2008, 5, 30], [2008, 6, 30], [2008, 7, 30], [2008, 8, 30], [2008, 9, 30], [2008, 10, 30], [2008, 11, 30], [2008, 12, 30], [2009, 1, 30], [2009, 2, 28], [2009, 3, 30], [2009, 4, 30], [2009, 5, 30], [2009, 6, 30], [2009, 7, 30], [2009, 8, 30], [2009, 9, 30], [2009, 10, 30], [2009, 11, 30], [2009, 12, 30], [2010, 1, 30], [2010, 2, 28], [2010, 3, 30], [2010, 4, 30], [2010, 5, 30], [2010, 6, 30], [2010, 7, 30], [2010, 8, 30], [2010, 9, 30], [2010, 10, 30], [2010, 11, 30], [2010, 12, 30], [2011, 1, 30]]], ['partial repair probe 2', [[2002, 6, 15], [2003, 6, 30], 12, True], [[2002, 6, 30], [2003, 6, 30]]], ['boundary control 1', [[2024, 2, 20], [2025, 2, 28], 6, True], [[2024, 8, 31], [2025, 2, 28]]], ['boundary control 2', [[2024, 3, 1], [2025, 3, 15], 6, False], [[2024, 9, 15], [2025, 3, 15]]], ['normal control 1', [[2024, 8, 1], [2025, 4, 30], 1, False], [[2024, 8, 30], [2024, 9, 30], [2024, 10, 30], [2024, 11, 30], [2024, 12, 30], [2025, 1, 30], [2025, 2, 28], [2025, 3, 30], [2025, 4, 30]]], ['normal control 2', [[2038, 4, 15], [2038, 4, 30], 3, False], [[2038, 4, 30]]]], [['regression single coupon stub guard 1', [[2005, 4, 2], [2005, 4, 10], 12, True], [[2005, 4, 10]]], ['regression single coupon stub guard 2', [[2027, 8, 22], [2027, 8, 31], 6, False], [[2027, 8, 31]]], ['partial repair probe 1', [[2001, 11, 15], [2003, 10, 31], 1, False], [[2001, 11, 30], [2001, 12, 31], [2002, 1, 31], [2002, 2, 28], [2002, 3, 31], [2002, 4, 30], [2002, 5, 31], [2002, 6, 30], [2002, 7, 31], [2002, 8, 31], [2002, 9, 30], [2002, 10, 31], [2002, 11, 30], [2002, 12, 31], [2003, 1, 31], [2003, 2, 28], [2003, 3, 31], [2003, 4, 30], [2003, 5, 31], [2003, 6, 30], [2003, 7, 31], [2003, 8, 31], [2003, 9, 30], [2003, 10, 31]]], ['partial repair probe 2', [[2019, 6, 11], [2020, 3, 26], 1, True], [[2019, 6, 26], [2019, 7, 26], [2019, 8, 26], [2019, 9, 26], [2019, 10, 26], [2019, 11, 26], [2019, 12, 26], [2020, 1, 26], [2020, 2, 26], [2020, 3, 26]]], ['boundary control 1', [[2024, 1, 10], [2025, 8, 31], 6, False], [[2024, 2, 29], [2024, 8, 31], [2025, 2, 28], [2025, 8, 31]]], ['boundary control 2', [[2024, 1, 10], [2025, 8, 31], 6, True], [[2024, 2, 29], [2024, 8, 31], [2025, 2, 28], [2025, 8, 31]]], ['normal control 1', [[2000, 2, 20], [2003, 5, 30], 6, True], [[2000, 5, 30], [2000, 11, 30], [2001, 5, 30], [2001, 11, 30], [2002, 5, 30], [2002, 11, 30], [2003, 5, 30]]], ['normal control 2', [[2008, 9, 18], [2012, 9, 17], 6, True], [[2009, 3, 17], [2009, 9, 17], [2010, 3, 17], [2010, 9, 17], [2011, 3, 17], [2011, 9, 17], [2012, 3, 17], [2012, 9, 17]]]], [['regression single coupon stub guard 1', [[2025, 5, 29], [2025, 5, 30], 12, True], [[2025, 5, 30]]], ['regression single coupon stub guard 2', [[2037, 9, 17], [2037, 9, 30], 3, True], [[2037, 9, 30]]], ['partial repair probe 1', [[2011, 1, 19], [2014, 5, 3], 3, False], [[2011, 2, 3], [2011, 5, 3], [2011, 8, 3], [2011, 11, 3], [2012, 2, 3], [2012, 5, 3], [2012, 8, 3], [2012, 11, 3], [2013, 2, 3], [2013, 5, 3], [2013, 8, 3], [2013, 11, 3], [2014, 2, 3], [2014, 5, 3]]], ['partial repair probe 2', [[2040, 4, 15], [2040, 9, 30], 1, False], [[2040, 4, 30], [2040, 5, 30], [2040, 6, 30], [2040, 7, 30], [2040, 8, 30], [2040, 9, 30]]], ['boundary control 1', [[2024, 3, 1], [2025, 3, 15], 6, False], [[2024, 9, 15], [2025, 3, 15]]], ['boundary control 2', [[2024, 1, 10], [2025, 8, 31], 6, False], [[2024, 2, 29], [2024, 8, 31], [2025, 2, 28], [2025, 8, 31]]], ['normal control 1', [[2019, 8, 23], [2023, 5, 31], 6, True], [[2019, 11, 30], [2020, 5, 31], [2020, 11, 30], [2021, 5, 31], [2021, 11, 30], [2022, 5, 31], [2022, 11, 30], [2023, 5, 31]]], ['normal control 2', [[2010, 1, 1], [2011, 11, 30], 6, False], [[2010, 5, 30], [2010, 11, 30], [2011, 5, 30], [2011, 11, 30]]]], [['regression single coupon stub guard 1', [[2009, 2, 27], [2009, 2, 28], 1, False], [[2009, 2, 28]]], ['regression single coupon stub guard 2', [[2018, 5, 29], [2018, 5, 31], 1, True], [[2018, 5, 31]]], ['partial repair probe 1', [[2013, 8, 13], [2014, 11, 28], 3, True], [[2013, 8, 28], [2013, 11, 28], [2014, 2, 28], [2014, 5, 28], [2014, 8, 28], [2014, 11, 28]]], ['partial repair probe 2', [[2010, 7, 14], [2010, 10, 29], 1, False], [[2010, 7, 29], [2010, 8, 29], [2010, 9, 29], [2010, 10, 29]]], ['boundary control 1', [[2024, 1, 10], [2025, 8, 31], 6, True], [[2024, 2, 29], [2024, 8, 31], [2025, 2, 28], [2025, 8, 31]]], ['boundary control 2', [[2024, 3, 15], [2025, 3, 15], 3, False], [[2024, 6, 15], [2024, 9, 15], [2024, 12, 15], [2025, 3, 15]]], ['normal control 1', [[2038, 8, 19], [2040, 7, 31], 12, True], [[2039, 7, 31], [2040, 7, 31]]], ['normal control 2', [[2021, 11, 29], [2024, 4, 30], 6, False], [[2022, 4, 30], [2022, 10, 30], [2023, 4, 30], [2023, 10, 30], [2024, 4, 30]]]]]\nfor label, args, expected in fixtures[N-1]:\n    check(label, 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 toy contract stated explicitly in the contract field; no claim of conformance to any published convention text. 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-bond_day_count_conventions-backward-coupon-schedule-single-coupon-stub-guard","generated_at":"2026-09-29T14:46:50.681082+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"Bond accrual and pricing systems depend on exact day-count arithmetic; a single-day error changes settlement cash.","repair":"Remove a short first coupon only when at least one later coupon remains.","root_cause":"The short-stub removal no longer requires another coupon to absorb the stub.","sha256":"4a911bcfa6d8280ce3dd3b79528337f02631c17e484f354e1ca46162b1a4b152","title":"Backward coupon schedule generation: the only remaining coupon can be removed as a stub · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verification":{"attempt":{"elapsed_ms":50.662,"exit_code":1,"observations":[{"actual":[[2036,12,31]],"check":"regression single coupon stub guard 1","expected":[[2036,12,31]],"passed":true},{"actual":[[2024,3,31]],"check":"regression single coupon stub guard 2","expected":[[2024,3,31]],"passed":true},{"actual":[[2010,3,30],[2010,6,30],[2010,9,30],[2010,12,30],[2011,3,30],[2011,6,30],[2011,9,30],[2011,12,30],[2012,3,30],[2012,6,30],[2012,9,30]],"check":"partial repair probe 1","expected":[[2009,12,30],[2010,3,30],[2010,6,30],[2010,9,30],[2010,12,30],[2011,3,30],[2011,6,30],[2011,9,30],[2011,12,30],[2012,3,30],[2012,6,30],[2012,9,30]],"passed":false},{"actual":[[2008,1,31],[2008,7,31],[2009,1,31],[2009,7,31],[2010,1,31]],"check":"partial repair probe 2","expected":[[2007,7,31],[2008,1,31],[2008,7,31],[2009,1,31],[2009,7,31],[2010,1,31]],"passed":false},{"actual":[[2024,6,15],[2024,9,15],[2024,12,15],[2025,3,15]],"check":"boundary control 1","expected":[[2024,6,15],[2024,9,15],[2024,12,15],[2025,3,15]],"passed":true},{"actual":[[2024,2,29],[2024,8,31],[2025,2,28],[2025,8,31]],"check":"boundary control 2","expected":[[2024,2,29],[2024,8,31],[2025,2,28],[2025,8,31]],"passed":true},{"actual":[[2025,6,30],[2025,12,31],[2026,6,30],[2026,12,31],[2027,6,30],[2027,12,31],[2028,6,30],[2028,12,31]],"check":"normal control 1","expected":[[2025,6,30],[2025,12,31],[2026,6,30],[2026,12,31],[2027,6,30],[2027,12,31],[2028,6,30],[2028,12,31]],"passed":true},{"actual":[[2019,3,30],[2019,6,30],[2019,9,30],[2019,12,30],[2020,3,30],[2020,6,30]],"check":"normal control 2","expected":[[2019,3,30],[2019,6,30],[2019,9,30],[2019,12,30],[2020,3,30],[2020,6,30]],"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"regression single coupon stub guard 1\", \"actual\": [[2036, 12, 31]], \"expected\": [[2036, 12, 31]], \"passed\": true}, {\"check\": \"regression single coupon stub guard 2\", \"actual\": [[2024, 3, 31]], \"expected\": [[2024, 3, 31]], \"passed\": true}, {\"check\": \"partial repair probe 1\", \"actual\": [[2010, 3, 30], [2010, 6, 30], [2010, 9, 30], [2010, 12, 30], [2011, 3, 30], [2011, 6, 30], [2011, 9, 30], [2011, 12, 30], [2012, 3, 30], [2012, 6, 30], [2012, 9, 30]], \"expected\": [[2009, 12, 30], [2010, 3, 30], [2010, 6, 30], [2010, 9, 30], [2010, 12, 30], [2011, 3, 30], [2011, 6, 30], [2011, 9, 30], [2011, 12, 30], [2012, 3, 30], [2012, 6, 30], [2012, 9, 30]], \"passed\": false}, {\"check\": \"partial repair probe 2\", \"actual\": [[2008, 1, 31], [2008, 7, 31], [2009, 1, 31], [2009, 7, 31], [2010, 1, 31]], \"expected\": [[2007, 7, 31], [2008, 1, 31], [2008, 7, 31], [2009, 1, 31], [2009, 7, 31], [2010, 1, 31]], \"passed\": false}, {\"check\": \"boundary control 1\", \"actual\": [[2024, 6, 15], [2024, 9, 15], [2024, 12, 15], [2025, 3, 15]], \"expected\": [[2024, 6, 15], [2024, 9, 15], [2024, 12, 15], [2025, 3, 15]], \"passed\": true}, {\"check\": \"boundary control 2\", \"actual\": [[2024, 2, 29], [2024, 8, 31], [2025, 2, 28], [2025, 8, 31]], \"expected\": [[2024, 2, 29], [2024, 8, 31], [2025, 2, 28], [2025, 8, 31]], \"passed\": true}, {\"check\": \"normal control 1\", \"actual\": [[2025, 6, 30], [2025, 12, 31], [2026, 6, 30], [2026, 12, 31], [2027, 6, 30], [2027, 12, 31], [2028, 6, 30], [2028, 12, 31]], \"expected\": [[2025, 6, 30], [2025, 12, 31], [2026, 6, 30], [2026, 12, 31], [2027, 6, 30], [2027, 12, 31], [2028, 6, 30], [2028, 12, 31]], \"passed\": true}, {\"check\": \"normal control 2\", \"actual\": [[2019, 3, 30], [2019, 6, 30], [2019, 9, 30], [2019, 12, 30], [2020, 3, 30], [2020, 6, 30]], \"expected\": [[2019, 3, 30], [2019, 6, 30], [2019, 9, 30], [2019, 12, 30], [2020, 3, 30], [2020, 6, 30]], \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":50.739,"exit_code":1,"observations":[{"actual":[],"check":"regression single coupon stub guard 1","expected":[[2036,12,31]],"passed":false},{"actual":[],"check":"regression single coupon stub guard 2","expected":[[2024,3,31]],"passed":false},{"actual":[[2009,12,30],[2010,3,30],[2010,6,30],[2010,9,30],[2010,12,30],[2011,3,30],[2011,6,30],[2011,9,30],[2011,12,30],[2012,3,30],[2012,6,30],[2012,9,30]],"check":"partial repair probe 1","expected":[[2009,12,30],[2010,3,30],[2010,6,30],[2010,9,30],[2010,12,30],[2011,3,30],[2011,6,30],[2011,9,30],[2011,12,30],[2012,3,30],[2012,6,30],[2012,9,30]],"passed":true},{"actual":[[2007,7,31],[2008,1,31],[2008,7,31],[2009,1,31],[2009,7,31],[2010,1,31]],"check":"partial repair probe 2","expected":[[2007,7,31],[2008,1,31],[2008,7,31],[2009,1,31],[2009,7,31],[2010,1,31]],"passed":true},{"actual":[[2024,6,15],[2024,9,15],[2024,12,15],[2025,3,15]],"check":"boundary control 1","expected":[[2024,6,15],[2024,9,15],[2024,12,15],[2025,3,15]],"passed":true},{"actual":[[2024,2,29],[2024,8,31],[2025,2,28],[2025,8,31]],"check":"boundary control 2","expected":[[2024,2,29],[2024,8,31],[2025,2,28],[2025,8,31]],"passed":true},{"actual":[[2025,6,30],[2025,12,31],[2026,6,30],[2026,12,31],[2027,6,30],[2027,12,31],[2028,6,30],[2028,12,31]],"check":"normal control 1","expected":[[2025,6,30],[2025,12,31],[2026,6,30],[2026,12,31],[2027,6,30],[2027,12,31],[2028,6,30],[2028,12,31]],"passed":true},{"actual":[[2019,3,30],[2019,6,30],[2019,9,30],[2019,12,30],[2020,3,30],[2020,6,30]],"check":"normal control 2","expected":[[2019,3,30],[2019,6,30],[2019,9,30],[2019,12,30],[2020,3,30],[2020,6,30]],"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"regression single coupon stub guard 1\", \"actual\": [], \"expected\": [[2036, 12, 31]], \"passed\": false}, {\"check\": \"regression single coupon stub guard 2\", \"actual\": [], \"expected\": [[2024, 3, 31]], \"passed\": false}, {\"check\": \"partial repair probe 1\", \"actual\": [[2009, 12, 30], [2010, 3, 30], [2010, 6, 30], [2010, 9, 30], [2010, 12, 30], [2011, 3, 30], [2011, 6, 30], [2011, 9, 30], [2011, 12, 30], [2012, 3, 30], [2012, 6, 30], [2012, 9, 30]], \"expected\": [[2009, 12, 30], [2010, 3, 30], [2010, 6, 30], [2010, 9, 30], [2010, 12, 30], [2011, 3, 30], [2011, 6, 30], [2011, 9, 30], [2011, 12, 30], [2012, 3, 30], [2012, 6, 30], [2012, 9, 30]], \"passed\": true}, {\"check\": \"partial repair probe 2\", \"actual\": [[2007, 7, 31], [2008, 1, 31], [2008, 7, 31], [2009, 1, 31], [2009, 7, 31], [2010, 1, 31]], \"expected\": [[2007, 7, 31], [2008, 1, 31], [2008, 7, 31], [2009, 1, 31], [2009, 7, 31], [2010, 1, 31]], \"passed\": true}, {\"check\": \"boundary control 1\", \"actual\": [[2024, 6, 15], [2024, 9, 15], [2024, 12, 15], [2025, 3, 15]], \"expected\": [[2024, 6, 15], [2024, 9, 15], [2024, 12, 15], [2025, 3, 15]], \"passed\": true}, {\"check\": \"boundary control 2\", \"actual\": [[2024, 2, 29], [2024, 8, 31], [2025, 2, 28], [2025, 8, 31]], \"expected\": [[2024, 2, 29], [2024, 8, 31], [2025, 2, 28], [2025, 8, 31]], \"passed\": true}, {\"check\": \"normal control 1\", \"actual\": [[2025, 6, 30], [2025, 12, 31], [2026, 6, 30], [2026, 12, 31], [2027, 6, 30], [2027, 12, 31], [2028, 6, 30], [2028, 12, 31]], \"expected\": [[2025, 6, 30], [2025, 12, 31], [2026, 6, 30], [2026, 12, 31], [2027, 6, 30], [2027, 12, 31], [2028, 6, 30], [2028, 12, 31]], \"passed\": true}, {\"check\": \"normal control 2\", \"actual\": [[2019, 3, 30], [2019, 6, 30], [2019, 9, 30], [2019, 12, 30], [2020, 3, 30], [2020, 6, 30]], \"expected\": [[2019, 3, 30], [2019, 6, 30], [2019, 9, 30], [2019, 12, 30], [2020, 3, 30], [2020, 6, 30]], \"passed\": true}], \"passed\": false}\n"},"fixed":{"elapsed_ms":46.377,"exit_code":0,"observations":[{"actual":[[2036,12,31]],"check":"regression single coupon stub guard 1","expected":[[2036,12,31]],"passed":true},{"actual":[[2024,3,31]],"check":"regression single coupon stub guard 2","expected":[[2024,3,31]],"passed":true},{"actual":[[2009,12,30],[2010,3,30],[2010,6,30],[2010,9,30],[2010,12,30],[2011,3,30],[2011,6,30],[2011,9,30],[2011,12,30],[2012,3,30],[2012,6,30],[2012,9,30]],"check":"partial repair probe 1","expected":[[2009,12,30],[2010,3,30],[2010,6,30],[2010,9,30],[2010,12,30],[2011,3,30],[2011,6,30],[2011,9,30],[2011,12,30],[2012,3,30],[2012,6,30],[2012,9,30]],"passed":true},{"actual":[[2007,7,31],[2008,1,31],[2008,7,31],[2009,1,31],[2009,7,31],[2010,1,31]],"check":"partial repair probe 2","expected":[[2007,7,31],[2008,1,31],[2008,7,31],[2009,1,31],[2009,7,31],[2010,1,31]],"passed":true},{"actual":[[2024,6,15],[2024,9,15],[2024,12,15],[2025,3,15]],"check":"boundary control 1","expected":[[2024,6,15],[2024,9,15],[2024,12,15],[2025,3,15]],"passed":true},{"actual":[[2024,2,29],[2024,8,31],[2025,2,28],[2025,8,31]],"check":"boundary control 2","expected":[[2024,2,29],[2024,8,31],[2025,2,28],[2025,8,31]],"passed":true},{"actual":[[2025,6,30],[2025,12,31],[2026,6,30],[2026,12,31],[2027,6,30],[2027,12,31],[2028,6,30],[2028,12,31]],"check":"normal control 1","expected":[[2025,6,30],[2025,12,31],[2026,6,30],[2026,12,31],[2027,6,30],[2027,12,31],[2028,6,30],[2028,12,31]],"passed":true},{"actual":[[2019,3,30],[2019,6,30],[2019,9,30],[2019,12,30],[2020,3,30],[2020,6,30]],"check":"normal control 2","expected":[[2019,3,30],[2019,6,30],[2019,9,30],[2019,12,30],[2020,3,30],[2020,6,30]],"passed":true}],"passed":true,"stderr":"","stdout":"{\"observations\": [{\"check\": \"regression single coupon stub guard 1\", \"actual\": [[2036, 12, 31]], \"expected\": [[2036, 12, 31]], \"passed\": true}, {\"check\": \"regression single coupon stub guard 2\", \"actual\": [[2024, 3, 31]], \"expected\": [[2024, 3, 31]], \"passed\": true}, {\"check\": \"partial repair probe 1\", \"actual\": [[2009, 12, 30], [2010, 3, 30], [2010, 6, 30], [2010, 9, 30], [2010, 12, 30], [2011, 3, 30], [2011, 6, 30], [2011, 9, 30], [2011, 12, 30], [2012, 3, 30], [2012, 6, 30], [2012, 9, 30]], \"expected\": [[2009, 12, 30], [2010, 3, 30], [2010, 6, 30], [2010, 9, 30], [2010, 12, 30], [2011, 3, 30], [2011, 6, 30], [2011, 9, 30], [2011, 12, 30], [2012, 3, 30], [2012, 6, 30], [2012, 9, 30]], \"passed\": true}, {\"check\": \"partial repair probe 2\", \"actual\": [[2007, 7, 31], [2008, 1, 31], [2008, 7, 31], [2009, 1, 31], [2009, 7, 31], [2010, 1, 31]], \"expected\": [[2007, 7, 31], [2008, 1, 31], [2008, 7, 31], [2009, 1, 31], [2009, 7, 31], [2010, 1, 31]], \"passed\": true}, {\"check\": \"boundary control 1\", \"actual\": [[2024, 6, 15], [2024, 9, 15], [2024, 12, 15], [2025, 3, 15]], \"expected\": [[2024, 6, 15], [2024, 9, 15], [2024, 12, 15], [2025, 3, 15]], \"passed\": true}, {\"check\": \"boundary control 2\", \"actual\": [[2024, 2, 29], [2024, 8, 31], [2025, 2, 28], [2025, 8, 31]], \"expected\": [[2024, 2, 29], [2024, 8, 31], [2025, 2, 28], [2025, 8, 31]], \"passed\": true}, {\"check\": \"normal control 1\", \"actual\": [[2025, 6, 30], [2025, 12, 31], [2026, 6, 30], [2026, 12, 31], [2027, 6, 30], [2027, 12, 31], [2028, 6, 30], [2028, 12, 31]], \"expected\": [[2025, 6, 30], [2025, 12, 31], [2026, 6, 30], [2026, 12, 31], [2027, 6, 30], [2027, 12, 31], [2028, 6, 30], [2028, 12, 31]], \"passed\": true}, {\"check\": \"normal control 2\", \"actual\": [[2019, 3, 30], [2019, 6, 30], [2019, 9, 30], [2019, 12, 30], [2020, 3, 30], [2020, 6, 30]], \"expected\": [[2019, 3, 30], [2019, 6, 30], [2019, 9, 30], [2019, 12, 30], [2020, 3, 30], [2020, 6, 30]], \"passed\": true}], \"passed\": true}\n"}},"verified":true,"visibility":"public"}