{"abstract":"Magic find changes the total but not which item is chosen.","category":"Game economy crafting balance","checks":8,"contract":"table = [[item, rarity, weight], ...]. Non-common weights become floor(w*(100+mf)/100) (mf may be negative). With total boosted weight T (None if 0), target = floor(roll*T/10000) for roll 0..9999; return the first item whose cumulative boosted weight exceeds target.","evaluation_group":"w2-game-economy-crafting-balance-loot-magic-find","failed_approach":"Boosting every original weight during the walk also boosts commons.","family":"w2-game-economy-crafting-balance-loot-magic-find-cumulative-weight-source","id":"FA-86131","implementations":{"attempt":{"sha256":"fe8ab0ea81c6b2b02b32eddf74406479d95776942cbcdd8edace2d5d5caf831f","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(table, roll, magic_find):\n    weights = []\n    for item, rarity, w in table:\n        if rarity != 'common':\n            w = w * (100 + magic_find) // 100\n        weights.append(w)\n    total = sum(weights)\n    if total == 0:\n        return None\n    target = roll * total // 10000\n    acc = 0\n    for (item, rarity, w0), w in zip(table, weights):\n        acc += w0 * (100 + magic_find) // 100\n        if target < acc:\n            return item\n    return None\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncases = [[('legendary boosted #1', [[['sword', 'common', 90], ['crown', 'legendary', 10]], 9500, 100], 'crown'),\n  ('curse lowers rare #1', [[['gem', 'rare', 10], ['rock', 'common', 10]], 4000, -50], 'rock'),\n  ('fault site cumulative weight source #1', [[['i0', 'common', 10], ['i1', 'rare', 50]], 9999, 50], 'i1'),\n  ('partial repair boundary #1',\n   [[['i0', 'common', 10], ['i1', 'common', 50], ['i2', 'legendary', 50]], 793, -50],\n   'i0'),\n  ('partial repair boundary #2', [[['i0', 'common', 1]], 0, -50], 'i0'),\n  ('zero weight entry skipped #1',\n   [[['a', 'common', 1], ['b', 'rare', 0], ['c', 'common', 1]], 5000, 0],\n   'c'),\n  ('control #1', [[['i0', 'rare', 1], ['i1', 'common', 10], ['i2', 'legendary', 93]], 0, 100], 'i0'),\n  ('control #2',\n   [[['i0', 'rare', 1],\n     ['i1', 'rare', 39],\n     ['i2', 'legendary', 1],\n     ['i3', 'rare', 50],\n     ['i4', 'legendary', 5]],\n    9999,\n    0],\n   'i4')],\n [('curse lowers rare #1', [[['gem', 'rare', 10], ['rock', 'common', 10]], 4000, -50], 'rock'),\n  ('legendary boosted #1', [[['sword', 'common', 90], ['crown', 'legendary', 10]], 9500, 100], 'crown'),\n  ('fault site cumulative weight source #1', [[['i0', 'common', 10], ['i1', 'rare', 50]], 9999, 50], 'i1'),\n  ('fault site cumulative weight source #2',\n   [[['i0', 'legendary', 1], ['i1', 'common', 5], ['i2', 'legendary', 0], ['i3', 'legendary', 5]], 9999, 50],\n   'i3'),\n  ('partial repair boundary #1', [[['i0', 'common', 1]], 0, -50], 'i0'),\n  ('partial repair boundary #2', [[['i0', 'common', 0], ['i1', 'common', 5]], 9999, -50], 'i1'),\n  ('zero weight entry skipped #1',\n   [[['a', 'common', 1], ['b', 'rare', 0], ['c', 'common', 1]], 5000, 0],\n   'c'),\n  ('control #1', [[['i0', 'rare', 1], ['i1', 'common', 10], ['i2', 'legendary', 93]], 0, 100], 'i0')],\n [('legendary boosted #1', [[['sword', 'common', 90], ['crown', 'legendary', 10]], 9500, 100], 'crown'),\n  ('fault site cumulative weight source #1',\n   [[['i0', 'legendary', 50], ['i1', 'rare', 35]], 9999, 100],\n   'i1'),\n  ('fault site cumulative weight source #2',\n   [[['i0', 'legendary', 2], ['i1', 'legendary', 50], ['i2', 'rare', 10]], 5000, 100],\n   'i1'),\n  ('partial repair boundary #1',\n   [[['i0', 'legendary', 0], ['i1', 'common', 0], ['i2', 'common', 50], ['i3', 'common', 50]], 5000, -50],\n   'i3'),\n  ('regression cumulative weight source #1',\n   [[['i0', 'common', 2], ['i1', 'common', 50], ['i2', 'rare', 41], ['i3', 'rare', 50], ['i4', 'common', 2]],\n    9999,\n    100],\n   'i4'),\n  ('zero weight entry skipped #1',\n   [[['a', 'common', 1], ['b', 'rare', 0], ['c', 'common', 1]], 5000, 0],\n   'c'),\n  ('control #1',\n   [[['i0', 'legendary', 10],\n     ['i1', 'rare', 50],\n     ['i2', 'legendary', 0],\n     ['i3', 'common', 2],\n     ['i4', 'common', 55]],\n    0,\n    -50],\n   'i0'),\n  ('control #2', [[['i0', 'rare', 0], ['i1', 'rare', 1]], 494, 100], 'i1')],\n [('curse lowers rare #1', [[['gem', 'rare', 10], ['rock', 'common', 10]], 4000, -50], 'rock'),\n  ('legendary boosted #1', [[['sword', 'common', 90], ['crown', 'legendary', 10]], 9500, 100], 'crown'),\n  ('fault site cumulative weight source #1',\n   [[['i0', 'rare', 5],\n     ['i1', 'legendary', 10],\n     ['i2', 'legendary', 2],\n     ['i3', 'rare', 86],\n     ['i4', 'legendary', 1]],\n    9999,\n    100],\n   'i4'),\n  ('fault site cumulative weight source #2',\n   [[['i0', 'common', 5], ['i1', 'rare', 1], ['i2', 'rare', 5]], 9999, 250],\n   'i2'),\n  ('partial repair boundary #1',\n   [[['i0', 'common', 10], ['i1', 'common', 5], ['i2', 'legendary', 2], ['i3', 'legendary', 1]], 4998, 181],\n   'i1'),\n  ('regression cumulative weight source #1',\n   [[['i0', 'legendary', 50], ['i1', 'legendary', 83], ['i2', 'common', 78], ['i3', 'common', 95]],\n    5000,\n    -50],\n   'i2'),\n  ('zero weight entry skipped #1',\n   [[['a', 'common', 1], ['b', 'rare', 0], ['c', 'common', 1]], 5000, 0],\n   'c'),\n  ('control #1',\n   [[['i0', 'rare', 2], ['i1', 'legendary', 5], ['i2', 'legendary', 2], ['i3', 'legendary', 5]], 0, -50],\n   'i0')],\n [('legendary boosted #1', [[['sword', 'common', 90], ['crown', 'legendary', 10]], 9500, 100], 'crown'),\n  ('fault site cumulative weight source #1', [[['i0', 'rare', 1], ['i1', 'rare', 2]], 1, -50], 'i1'),\n  ('fault site cumulative weight source #2', [[['i0', 'rare', 5]], 9999, 100], 'i0'),\n  ('partial repair boundary #1', [[['i0', 'common', 50], ['i1', 'common', 50]], 2592, -50], 'i0'),\n  ('partial repair boundary #2',\n   [[['i0', 'legendary', 2], ['i1', 'legendary', 2], ['i2', 'common', 10]], 8581, -50],\n   'i2'),\n  ('zero weight entry skipped #1',\n   [[['a', 'common', 1], ['b', 'rare', 0], ['c', 'common', 1]], 5000, 0],\n   'c'),\n  ('control #1', [[['i0', 'common', 50]], 1, 100], 'i0'),\n  ('control #2',\n   [[['i0', 'rare', 0], ['i1', 'legendary', 2], ['i2', 'common', 2], ['i3', 'common', 1]], 9999, 0],\n   'i3')]]\nfor label, args, expected in cases[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":"6cb4588bf82722d6cfdf744abc0ce12303676aa175a5c8a4999be75fce0e075f","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(table, roll, magic_find):\n    weights = []\n    for item, rarity, w in table:\n        if rarity != 'common':\n            w = w * (100 + magic_find) // 100\n        weights.append(w)\n    total = sum(weights)\n    if total == 0:\n        return None\n    target = roll * total // 10000\n    acc = 0\n    for (item, rarity, w0), w in zip(table, weights):\n        acc += w0\n        if target < acc:\n            return item\n    return None\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncases = [[('legendary boosted #1', [[['sword', 'common', 90], ['crown', 'legendary', 10]], 9500, 100], 'crown'),\n  ('curse lowers rare #1', [[['gem', 'rare', 10], ['rock', 'common', 10]], 4000, -50], 'rock'),\n  ('fault site cumulative weight source #1', [[['i0', 'common', 10], ['i1', 'rare', 50]], 9999, 50], 'i1'),\n  ('partial repair boundary #1',\n   [[['i0', 'common', 10], ['i1', 'common', 50], ['i2', 'legendary', 50]], 793, -50],\n   'i0'),\n  ('partial repair boundary #2', [[['i0', 'common', 1]], 0, -50], 'i0'),\n  ('zero weight entry skipped #1',\n   [[['a', 'common', 1], ['b', 'rare', 0], ['c', 'common', 1]], 5000, 0],\n   'c'),\n  ('control #1', [[['i0', 'rare', 1], ['i1', 'common', 10], ['i2', 'legendary', 93]], 0, 100], 'i0'),\n  ('control #2',\n   [[['i0', 'rare', 1],\n     ['i1', 'rare', 39],\n     ['i2', 'legendary', 1],\n     ['i3', 'rare', 50],\n     ['i4', 'legendary', 5]],\n    9999,\n    0],\n   'i4')],\n [('curse lowers rare #1', [[['gem', 'rare', 10], ['rock', 'common', 10]], 4000, -50], 'rock'),\n  ('legendary boosted #1', [[['sword', 'common', 90], ['crown', 'legendary', 10]], 9500, 100], 'crown'),\n  ('fault site cumulative weight source #1', [[['i0', 'common', 10], ['i1', 'rare', 50]], 9999, 50], 'i1'),\n  ('fault site cumulative weight source #2',\n   [[['i0', 'legendary', 1], ['i1', 'common', 5], ['i2', 'legendary', 0], ['i3', 'legendary', 5]], 9999, 50],\n   'i3'),\n  ('partial repair boundary #1', [[['i0', 'common', 1]], 0, -50], 'i0'),\n  ('partial repair boundary #2', [[['i0', 'common', 0], ['i1', 'common', 5]], 9999, -50], 'i1'),\n  ('zero weight entry skipped #1',\n   [[['a', 'common', 1], ['b', 'rare', 0], ['c', 'common', 1]], 5000, 0],\n   'c'),\n  ('control #1', [[['i0', 'rare', 1], ['i1', 'common', 10], ['i2', 'legendary', 93]], 0, 100], 'i0')],\n [('legendary boosted #1', [[['sword', 'common', 90], ['crown', 'legendary', 10]], 9500, 100], 'crown'),\n  ('fault site cumulative weight source #1',\n   [[['i0', 'legendary', 50], ['i1', 'rare', 35]], 9999, 100],\n   'i1'),\n  ('fault site cumulative weight source #2',\n   [[['i0', 'legendary', 2], ['i1', 'legendary', 50], ['i2', 'rare', 10]], 5000, 100],\n   'i1'),\n  ('partial repair boundary #1',\n   [[['i0', 'legendary', 0], ['i1', 'common', 0], ['i2', 'common', 50], ['i3', 'common', 50]], 5000, -50],\n   'i3'),\n  ('regression cumulative weight source #1',\n   [[['i0', 'common', 2], ['i1', 'common', 50], ['i2', 'rare', 41], ['i3', 'rare', 50], ['i4', 'common', 2]],\n    9999,\n    100],\n   'i4'),\n  ('zero weight entry skipped #1',\n   [[['a', 'common', 1], ['b', 'rare', 0], ['c', 'common', 1]], 5000, 0],\n   'c'),\n  ('control #1',\n   [[['i0', 'legendary', 10],\n     ['i1', 'rare', 50],\n     ['i2', 'legendary', 0],\n     ['i3', 'common', 2],\n     ['i4', 'common', 55]],\n    0,\n    -50],\n   'i0'),\n  ('control #2', [[['i0', 'rare', 0], ['i1', 'rare', 1]], 494, 100], 'i1')],\n [('curse lowers rare #1', [[['gem', 'rare', 10], ['rock', 'common', 10]], 4000, -50], 'rock'),\n  ('legendary boosted #1', [[['sword', 'common', 90], ['crown', 'legendary', 10]], 9500, 100], 'crown'),\n  ('fault site cumulative weight source #1',\n   [[['i0', 'rare', 5],\n     ['i1', 'legendary', 10],\n     ['i2', 'legendary', 2],\n     ['i3', 'rare', 86],\n     ['i4', 'legendary', 1]],\n    9999,\n    100],\n   'i4'),\n  ('fault site cumulative weight source #2',\n   [[['i0', 'common', 5], ['i1', 'rare', 1], ['i2', 'rare', 5]], 9999, 250],\n   'i2'),\n  ('partial repair boundary #1',\n   [[['i0', 'common', 10], ['i1', 'common', 5], ['i2', 'legendary', 2], ['i3', 'legendary', 1]], 4998, 181],\n   'i1'),\n  ('regression cumulative weight source #1',\n   [[['i0', 'legendary', 50], ['i1', 'legendary', 83], ['i2', 'common', 78], ['i3', 'common', 95]],\n    5000,\n    -50],\n   'i2'),\n  ('zero weight entry skipped #1',\n   [[['a', 'common', 1], ['b', 'rare', 0], ['c', 'common', 1]], 5000, 0],\n   'c'),\n  ('control #1',\n   [[['i0', 'rare', 2], ['i1', 'legendary', 5], ['i2', 'legendary', 2], ['i3', 'legendary', 5]], 0, -50],\n   'i0')],\n [('legendary boosted #1', [[['sword', 'common', 90], ['crown', 'legendary', 10]], 9500, 100], 'crown'),\n  ('fault site cumulative weight source #1', [[['i0', 'rare', 1], ['i1', 'rare', 2]], 1, -50], 'i1'),\n  ('fault site cumulative weight source #2', [[['i0', 'rare', 5]], 9999, 100], 'i0'),\n  ('partial repair boundary #1', [[['i0', 'common', 50], ['i1', 'common', 50]], 2592, -50], 'i0'),\n  ('partial repair boundary #2',\n   [[['i0', 'legendary', 2], ['i1', 'legendary', 2], ['i2', 'common', 10]], 8581, -50],\n   'i2'),\n  ('zero weight entry skipped #1',\n   [[['a', 'common', 1], ['b', 'rare', 0], ['c', 'common', 1]], 5000, 0],\n   'c'),\n  ('control #1', [[['i0', 'common', 50]], 1, 100], 'i0'),\n  ('control #2',\n   [[['i0', 'rare', 0], ['i1', 'legendary', 2], ['i2', 'common', 2], ['i3', 'common', 1]], 9999, 0],\n   'i3')]]\nfor label, args, expected in cases[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":"222570aa00c0d9f8020883f3cc92882f5dd6b05546586c4c40038558b9a9ffda","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(table, roll, magic_find):\n    weights = []\n    for item, rarity, w in table:\n        if rarity != 'common':\n            w = w * (100 + magic_find) // 100\n        weights.append(w)\n    total = sum(weights)\n    if total == 0:\n        return None\n    target = roll * total // 10000\n    acc = 0\n    for (item, rarity, w0), w in zip(table, weights):\n        acc += w\n        if target < acc:\n            return item\n    return None\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncases = [[('legendary boosted #1', [[['sword', 'common', 90], ['crown', 'legendary', 10]], 9500, 100], 'crown'),\n  ('curse lowers rare #1', [[['gem', 'rare', 10], ['rock', 'common', 10]], 4000, -50], 'rock'),\n  ('fault site cumulative weight source #1', [[['i0', 'common', 10], ['i1', 'rare', 50]], 9999, 50], 'i1'),\n  ('partial repair boundary #1',\n   [[['i0', 'common', 10], ['i1', 'common', 50], ['i2', 'legendary', 50]], 793, -50],\n   'i0'),\n  ('partial repair boundary #2', [[['i0', 'common', 1]], 0, -50], 'i0'),\n  ('zero weight entry skipped #1',\n   [[['a', 'common', 1], ['b', 'rare', 0], ['c', 'common', 1]], 5000, 0],\n   'c'),\n  ('control #1', [[['i0', 'rare', 1], ['i1', 'common', 10], ['i2', 'legendary', 93]], 0, 100], 'i0'),\n  ('control #2',\n   [[['i0', 'rare', 1],\n     ['i1', 'rare', 39],\n     ['i2', 'legendary', 1],\n     ['i3', 'rare', 50],\n     ['i4', 'legendary', 5]],\n    9999,\n    0],\n   'i4')],\n [('curse lowers rare #1', [[['gem', 'rare', 10], ['rock', 'common', 10]], 4000, -50], 'rock'),\n  ('legendary boosted #1', [[['sword', 'common', 90], ['crown', 'legendary', 10]], 9500, 100], 'crown'),\n  ('fault site cumulative weight source #1', [[['i0', 'common', 10], ['i1', 'rare', 50]], 9999, 50], 'i1'),\n  ('fault site cumulative weight source #2',\n   [[['i0', 'legendary', 1], ['i1', 'common', 5], ['i2', 'legendary', 0], ['i3', 'legendary', 5]], 9999, 50],\n   'i3'),\n  ('partial repair boundary #1', [[['i0', 'common', 1]], 0, -50], 'i0'),\n  ('partial repair boundary #2', [[['i0', 'common', 0], ['i1', 'common', 5]], 9999, -50], 'i1'),\n  ('zero weight entry skipped #1',\n   [[['a', 'common', 1], ['b', 'rare', 0], ['c', 'common', 1]], 5000, 0],\n   'c'),\n  ('control #1', [[['i0', 'rare', 1], ['i1', 'common', 10], ['i2', 'legendary', 93]], 0, 100], 'i0')],\n [('legendary boosted #1', [[['sword', 'common', 90], ['crown', 'legendary', 10]], 9500, 100], 'crown'),\n  ('fault site cumulative weight source #1',\n   [[['i0', 'legendary', 50], ['i1', 'rare', 35]], 9999, 100],\n   'i1'),\n  ('fault site cumulative weight source #2',\n   [[['i0', 'legendary', 2], ['i1', 'legendary', 50], ['i2', 'rare', 10]], 5000, 100],\n   'i1'),\n  ('partial repair boundary #1',\n   [[['i0', 'legendary', 0], ['i1', 'common', 0], ['i2', 'common', 50], ['i3', 'common', 50]], 5000, -50],\n   'i3'),\n  ('regression cumulative weight source #1',\n   [[['i0', 'common', 2], ['i1', 'common', 50], ['i2', 'rare', 41], ['i3', 'rare', 50], ['i4', 'common', 2]],\n    9999,\n    100],\n   'i4'),\n  ('zero weight entry skipped #1',\n   [[['a', 'common', 1], ['b', 'rare', 0], ['c', 'common', 1]], 5000, 0],\n   'c'),\n  ('control #1',\n   [[['i0', 'legendary', 10],\n     ['i1', 'rare', 50],\n     ['i2', 'legendary', 0],\n     ['i3', 'common', 2],\n     ['i4', 'common', 55]],\n    0,\n    -50],\n   'i0'),\n  ('control #2', [[['i0', 'rare', 0], ['i1', 'rare', 1]], 494, 100], 'i1')],\n [('curse lowers rare #1', [[['gem', 'rare', 10], ['rock', 'common', 10]], 4000, -50], 'rock'),\n  ('legendary boosted #1', [[['sword', 'common', 90], ['crown', 'legendary', 10]], 9500, 100], 'crown'),\n  ('fault site cumulative weight source #1',\n   [[['i0', 'rare', 5],\n     ['i1', 'legendary', 10],\n     ['i2', 'legendary', 2],\n     ['i3', 'rare', 86],\n     ['i4', 'legendary', 1]],\n    9999,\n    100],\n   'i4'),\n  ('fault site cumulative weight source #2',\n   [[['i0', 'common', 5], ['i1', 'rare', 1], ['i2', 'rare', 5]], 9999, 250],\n   'i2'),\n  ('partial repair boundary #1',\n   [[['i0', 'common', 10], ['i1', 'common', 5], ['i2', 'legendary', 2], ['i3', 'legendary', 1]], 4998, 181],\n   'i1'),\n  ('regression cumulative weight source #1',\n   [[['i0', 'legendary', 50], ['i1', 'legendary', 83], ['i2', 'common', 78], ['i3', 'common', 95]],\n    5000,\n    -50],\n   'i2'),\n  ('zero weight entry skipped #1',\n   [[['a', 'common', 1], ['b', 'rare', 0], ['c', 'common', 1]], 5000, 0],\n   'c'),\n  ('control #1',\n   [[['i0', 'rare', 2], ['i1', 'legendary', 5], ['i2', 'legendary', 2], ['i3', 'legendary', 5]], 0, -50],\n   'i0')],\n [('legendary boosted #1', [[['sword', 'common', 90], ['crown', 'legendary', 10]], 9500, 100], 'crown'),\n  ('fault site cumulative weight source #1', [[['i0', 'rare', 1], ['i1', 'rare', 2]], 1, -50], 'i1'),\n  ('fault site cumulative weight source #2', [[['i0', 'rare', 5]], 9999, 100], 'i0'),\n  ('partial repair boundary #1', [[['i0', 'common', 50], ['i1', 'common', 50]], 2592, -50], 'i0'),\n  ('partial repair boundary #2',\n   [[['i0', 'legendary', 2], ['i1', 'legendary', 2], ['i2', 'common', 10]], 8581, -50],\n   'i2'),\n  ('zero weight entry skipped #1',\n   [[['a', 'common', 1], ['b', 'rare', 0], ['c', 'common', 1]], 5000, 0],\n   'c'),\n  ('control #1', [[['i0', 'common', 50]], 1, 100], 'i0'),\n  ('control #2',\n   [[['i0', 'rare', 0], ['i1', 'legendary', 2], ['i2', 'common', 2], ['i3', 'common', 1]], 9999, 0],\n   'i3')]]\nfor label, args, expected in cases[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":"Deterministic toy contract stipulated for this model; integer or exact arithmetic only, not a reproduction of any specific game engine. 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-game-economy-crafting-balance-loot-magic-find-cumulative-weight-source","generated_at":"2026-09-29T14:50:46.764556+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"Game economies leak or destroy currency when one crafting or pricing rule is off by one boundary, rounding stage or state update; the defect is observable in exact integer outcomes.","repair":"Restore `acc += w` at the cumulative weight source step.","root_cause":"The cumulative walk uses the original weights while the target uses boosted weights.","sha256":"d89929f2ad234663e5a4a062ee8328ccd03e91862980e82e962d37d480de0a26","title":"Magic find loot roll: Selection walks unboosted weights · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verification":{"attempt":{"elapsed_ms":43.055,"exit_code":1,"observations":[{"actual":"sword","check":"legendary boosted #1","expected":"crown","passed":false},{"actual":"rock","check":"curse lowers rare #1","expected":"rock","passed":true},{"actual":"i1","check":"fault site cumulative weight source #1","expected":"i1","passed":true},{"actual":"i1","check":"partial repair boundary #1","expected":"i0","passed":false},{"actual":null,"check":"partial repair boundary #2","expected":"i0","passed":false},{"actual":"c","check":"zero weight entry skipped #1","expected":"c","passed":true},{"actual":"i0","check":"control #1","expected":"i0","passed":true},{"actual":"i4","check":"control #2","expected":"i4","passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"legendary boosted #1\", \"actual\": \"sword\", \"expected\": \"crown\", \"passed\": false}, {\"check\": \"curse lowers rare #1\", \"actual\": \"rock\", \"expected\": \"rock\", \"passed\": true}, {\"check\": \"fault site cumulative weight source #1\", \"actual\": \"i1\", \"expected\": \"i1\", \"passed\": true}, {\"check\": \"partial repair boundary #1\", \"actual\": \"i1\", \"expected\": \"i0\", \"passed\": false}, {\"check\": \"partial repair boundary #2\", \"actual\": null, \"expected\": \"i0\", \"passed\": false}, {\"check\": \"zero weight entry skipped #1\", \"actual\": \"c\", \"expected\": \"c\", \"passed\": true}, {\"check\": \"control #1\", \"actual\": \"i0\", \"expected\": \"i0\", \"passed\": true}, {\"check\": \"control #2\", \"actual\": \"i4\", \"expected\": \"i4\", \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":42.864,"exit_code":1,"observations":[{"actual":null,"check":"legendary boosted #1","expected":"crown","passed":false},{"actual":"gem","check":"curse lowers rare 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