{"abstract":"Adding a new experiment at the end of a layer silently steals users from earlier ones.","category":"Feature flag rollout bucketing","checks":8,"contract":"bucket = int(md5(layer_salt + \":\" + user) hex, 16) % 1000. experiments is an ordered list of {name, start, end, paused?} with start/end in percent (one decimal) converted to permille by round(x * 10); ranges are half-open [start, end). The first listed range containing the bucket decides: a paused experiment reserves its range (user gets None). Return [bucket, name or None].","contract_signature":"layer_salt, user, experiments","evaluation_group":"w2-feature-flag-rollout-bucketing-exclusive-layer","failed_approach":"Choosing the narrowest containing range invents a specificity rule the contract never states.","family":"w2-feature-flag-rollout-bucketing-exclusive-layer-overlap-resolution","id":"FA-74076","implementations":{"attempt":{"sha256":"e78e6a802a98a7f53512f2302b046e17c7276d76fc1d557470155276d63f68ea","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nimport hashlib\nN = 1\nobservations = []\ndef solve(layer_salt, user, experiments):\n    bucket = int(hashlib.md5((layer_salt + ':' + user).encode()).hexdigest(), 16) % 1000\n    best = None\n    for exp in experiments:\n        lo = round(exp['start'] * 10)\n        hi = round(exp['end'] * 10)\n        if lo <= bucket < hi and (best is None or hi - lo < best[0]):\n            best = (hi - lo, exp)\n    if best is None:\n        return [bucket, None]\n    if best[1].get('paused'):\n        return [bucket, None]\n    return [bucket, best[1]['name']]\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = [[('bucket at range end belongs to next range',\n   ['layer-a', 'alice', [{'name': 'x', 'start': 0, 'end': 98.8}, {'name': 'y', 'start': 98.8, 'end': 100}]],\n   [988, 'y']),\n  ('bucket at range start is included',\n   ['layer-b', 'bob', [{'name': 'x', 'start': 30.9, 'end': 100}]],\n   [309, 'x']),\n  ('paused range reserves its users',\n   ['layer-a',\n    'alice',\n    [{'name': 'x', 'start': 0, 'end': 100, 'paused': True}, {'name': 'y', 'start': 0, 'end': 100}]],\n   [988, None]),\n  ('first listed overlapping range wins',\n   ['layer-b',\n    'bob',\n    [{'name': 'wide', 'start': 0, 'end': 100}, {'name': 'narrow', 'start': 30.9, 'end': 31.0}]],\n   [309, 'wide']),\n  ('percent bounds convert to permille',\n   ['layer-a', 'alice', [{'name': 'x', 'start': 98.3, 'end': 99.3}]],\n   [988, 'x']),\n  ('layer sample 1',\n   ['layer-a',\n    'u295',\n    [{'name': 'exp0', 'start': 50, 'end': 57.7, 'paused': False},\n     {'name': 'exp1', 'start': 0, 'end': 57.7, 'paused': False}]],\n   [576, 'exp0']),\n  ('layer sample 2',\n   ['layer-b',\n    'u4435',\n    [{'name': 'exp0', 'start': 0, 'end': 75.0, 'paused': True},\n     {'name': 'exp1', 'start': 0, 'end': 74.9, 'paused': False}]],\n   [750, None]),\n  ('layer sample 3',\n   ['layer-a',\n    'u3828',\n    [{'name': 'exp0', 'start': 1.72, 'end': 17.3, 'paused': False},\n     {'name': 'exp1', 'start': 0, 'end': 17.3, 'paused': True}]],\n   [172, 'exp0'])],\n [('bucket at range start is included',\n   ['layer-b', 'bob', [{'name': 'x', 'start': 30.9, 'end': 100}]],\n   [309, 'x']),\n  ('paused range reserves its users',\n   ['layer-a',\n    'alice',\n    [{'name': 'x', 'start': 0, 'end': 100, 'paused': True}, {'name': 'y', 'start': 0, 'end': 100}]],\n   [988, None]),\n  ('first listed overlapping range wins',\n   ['layer-b',\n    'bob',\n    [{'name': 'wide', 'start': 0, 'end': 100}, {'name': 'narrow', 'start': 30.9, 'end': 31.0}]],\n   [309, 'wide']),\n  ('percent bounds convert to permille',\n   ['layer-a', 'alice', [{'name': 'x', 'start': 98.3, 'end': 99.3}]],\n   [988, 'x']),\n  ('no range matches', ['layer-b', 'bob', [{'name': 'x', 'start': 0, 'end': 0}]], [309, None]),\n  ('layer sample 6',\n   ['layer-a', 'u2869', [{'name': 'exp0', 'start': 28.1, 'end': 50, 'paused': False}]],\n   [282, 'exp0']),\n  ('layer sample 18',\n   ['layer-b',\n    'u4000',\n    [{'name': 'exp0', 'start': 0, 'end': 2.83, 'paused': False},\n     {'name': 'exp1', 'start': 0, 'end': 100, 'paused': True},\n     {'name': 'exp2', 'start': 28.2, 'end': 28.4, 'paused': False}]],\n   [283, None]),\n  ('layer sample 48',\n   ['layer-a',\n    'u431',\n    [{'name': 'exp0', 'start': 0, 'end': 100, 'paused': False},\n     {'name': 'exp1', 'start': 20.0, 'end': 20.2, 'paused': True}]],\n   [201, 'exp0'])],\n [('paused range reserves its users',\n   ['layer-a',\n    'alice',\n    [{'name': 'x', 'start': 0, 'end': 100, 'paused': True}, {'name': 'y', 'start': 0, 'end': 100}]],\n   [988, None]),\n  ('first listed overlapping range wins',\n   ['layer-b',\n    'bob',\n    [{'name': 'wide', 'start': 0, 'end': 100}, {'name': 'narrow', 'start': 30.9, 'end': 31.0}]],\n   [309, 'wide']),\n  ('percent bounds convert to permille',\n   ['layer-a', 'alice', [{'name': 'x', 'start': 98.3, 'end': 99.3}]],\n   [988, 'x']),\n  ('no range matches', ['layer-b', 'bob', [{'name': 'x', 'start': 0, 'end': 0}]], [309, None]),\n  ('empty experiment list', ['layer-a', 'carol', []], [970, None]),\n  ('layer sample 11',\n   ['layer-b',\n    'u3995',\n    [{'name': 'exp0', 'start': 50, 'end': 84.5, 'paused': True},\n     {'name': 'exp1', 'start': 8.45, 'end': 84.5, 'paused': True}]],\n   [845, None]),\n  ('layer sample 39',\n   ['layer-b',\n    'u2441',\n    [{'name': 'exp0', 'start': 0, 'end': 75.8, 'paused': False},\n     {'name': 'exp1', 'start': 43.8, 'end': 100, 'paused': False}]],\n   [439, 'exp0']),\n  ('layer sample 47',\n   ['layer-b',\n    'u2172',\n    [{'name': 'exp0', 'start': 89.1, 'end': 89.3, 'paused': False},\n     {'name': 'exp1', 'start': 89.1, 'end': 100, 'paused': False}]],\n   [892, 'exp0'])],\n [('bucket at range end belongs to next range',\n   ['layer-a', 'alice', [{'name': 'x', 'start': 0, 'end': 98.8}, {'name': 'y', 'start': 98.8, 'end': 100}]],\n   [988, 'y']),\n  ('first listed overlapping range wins',\n   ['layer-b',\n    'bob',\n    [{'name': 'wide', 'start': 0, 'end': 100}, {'name': 'narrow', 'start': 30.9, 'end': 31.0}]],\n   [309, 'wide']),\n  ('percent bounds convert to permille',\n   ['layer-a', 'alice', [{'name': 'x', 'start': 98.3, 'end': 99.3}]],\n   [988, 'x']),\n  ('no range matches', ['layer-b', 'bob', [{'name': 'x', 'start': 0, 'end': 0}]], [309, None]),\n  ('empty experiment list', ['layer-a', 'carol', []], [970, None]),\n  ('layer sample 4',\n   ['layer-a',\n    'u309',\n    [{'name': 'exp0', 'start': 6.0, 'end': 50, 'paused': False},\n     {'name': 'exp1', 'start': 0, 'end': 5.9, 'paused': False},\n     {'name': 'exp2', 'start': 6.0, 'end': 50, 'paused': False}]],\n   [60, 'exp0']),\n  ('layer sample 16',\n   ['layer-a',\n    'u4745',\n    [{'name': 'exp0', 'start': 81.9, 'end': 100, 'paused': True},\n     {'name': 'exp1', 'start': 8.19, 'end': 82.0, 'paused': True},\n     {'name': 'exp2', 'start': 50, 'end': 82.0, 'paused': False}]],\n   [819, None]),\n  ('layer sample 28',\n   ['layer-a',\n    'u2535',\n    [{'name': 'exp0', 'start': 5.59, 'end': 56.0, 'paused': False},\n     {'name': 'exp1', 'start': 5.59, 'end': 100, 'paused': False},\n     {'name': 'exp2', 'start': 52.4, 'end': 100, 'paused': False}]],\n   [559, 'exp0'])],\n [('bucket at range end belongs to next range',\n   ['layer-a', 'alice', [{'name': 'x', 'start': 0, 'end': 98.8}, {'name': 'y', 'start': 98.8, 'end': 100}]],\n   [988, 'y']),\n  ('bucket at range start is included',\n   ['layer-b', 'bob', [{'name': 'x', 'start': 30.9, 'end': 100}]],\n   [309, 'x']),\n  ('percent bounds convert to permille',\n   ['layer-a', 'alice', [{'name': 'x', 'start': 98.3, 'end': 99.3}]],\n   [988, 'x']),\n  ('no range matches', ['layer-b', 'bob', [{'name': 'x', 'start': 0, 'end': 0}]], [309, None]),\n  ('empty experiment list', ['layer-a', 'carol', []], [970, None]),\n  ('layer sample 14',\n   ['layer-b',\n    'u1256',\n    [{'name': 'exp0', 'start': 50, 'end': 89.8, 'paused': False},\n     {'name': 'exp1', 'start': 89.7, 'end': 89.8, 'paused': False}]],\n   [897, 'exp0']),\n  ('layer sample 21',\n   ['layer-a',\n    'u505',\n    [{'name': 'exp0', 'start': 0, 'end': 100, 'paused': False},\n     {'name': 'exp1', 'start': 54.1, 'end': 100, 'paused': False}]],\n   [540, 'exp0']),\n  ('layer sample 38',\n   ['layer-a',\n    'u4816',\n    [{'name': 'exp0', 'start': 48.1, 'end': 65.6, 'paused': False},\n     {'name': 'exp1', 'start': 0, 'end': 65.6, 'paused': False}]],\n   [655, 'exp0'])]]\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":"94df9fbfa676153256a68e4fc1814e84c8d7c04132eaeaaecde3280be2a990b7","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nimport hashlib\nN = 1\nobservations = []\ndef solve(layer_salt, user, experiments):\n    bucket = int(hashlib.md5((layer_salt + ':' + user).encode()).hexdigest(), 16) % 1000\n    found = [bucket, None]\n    for exp in experiments:\n        lo = round(exp['start'] * 10)\n        hi = round(exp['end'] * 10)\n        if lo <= bucket < hi:\n            found = [bucket, None] if exp.get('paused') else [bucket, exp['name']]\n    return found\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = [[('bucket at range end belongs to next range',\n   ['layer-a', 'alice', [{'name': 'x', 'start': 0, 'end': 98.8}, {'name': 'y', 'start': 98.8, 'end': 100}]],\n   [988, 'y']),\n  ('bucket at range start is included',\n   ['layer-b', 'bob', [{'name': 'x', 'start': 30.9, 'end': 100}]],\n   [309, 'x']),\n  ('paused range reserves its users',\n   ['layer-a',\n    'alice',\n    [{'name': 'x', 'start': 0, 'end': 100, 'paused': True}, {'name': 'y', 'start': 0, 'end': 100}]],\n   [988, None]),\n  ('first listed overlapping range wins',\n   ['layer-b',\n    'bob',\n    [{'name': 'wide', 'start': 0, 'end': 100}, {'name': 'narrow', 'start': 30.9, 'end': 31.0}]],\n   [309, 'wide']),\n  ('percent bounds convert to permille',\n   ['layer-a', 'alice', [{'name': 'x', 'start': 98.3, 'end': 99.3}]],\n   [988, 'x']),\n  ('layer sample 1',\n   ['layer-a',\n    'u295',\n    [{'name': 'exp0', 'start': 50, 'end': 57.7, 'paused': False},\n     {'name': 'exp1', 'start': 0, 'end': 57.7, 'paused': False}]],\n   [576, 'exp0']),\n  ('layer sample 2',\n   ['layer-b',\n    'u4435',\n    [{'name': 'exp0', 'start': 0, 'end': 75.0, 'paused': True},\n     {'name': 'exp1', 'start': 0, 'end': 74.9, 'paused': False}]],\n   [750, None]),\n  ('layer sample 3',\n   ['layer-a',\n    'u3828',\n    [{'name': 'exp0', 'start': 1.72, 'end': 17.3, 'paused': False},\n     {'name': 'exp1', 'start': 0, 'end': 17.3, 'paused': True}]],\n   [172, 'exp0'])],\n [('bucket at range start is included',\n   ['layer-b', 'bob', [{'name': 'x', 'start': 30.9, 'end': 100}]],\n   [309, 'x']),\n  ('paused range reserves its users',\n   ['layer-a',\n    'alice',\n    [{'name': 'x', 'start': 0, 'end': 100, 'paused': True}, {'name': 'y', 'start': 0, 'end': 100}]],\n   [988, None]),\n  ('first listed overlapping range wins',\n   ['layer-b',\n    'bob',\n    [{'name': 'wide', 'start': 0, 'end': 100}, {'name': 'narrow', 'start': 30.9, 'end': 31.0}]],\n   [309, 'wide']),\n  ('percent bounds convert to permille',\n   ['layer-a', 'alice', [{'name': 'x', 'start': 98.3, 'end': 99.3}]],\n   [988, 'x']),\n  ('no range matches', ['layer-b', 'bob', [{'name': 'x', 'start': 0, 'end': 0}]], [309, None]),\n  ('layer sample 6',\n   ['layer-a', 'u2869', [{'name': 'exp0', 'start': 28.1, 'end': 50, 'paused': False}]],\n   [282, 'exp0']),\n  ('layer sample 18',\n   ['layer-b',\n    'u4000',\n    [{'name': 'exp0', 'start': 0, 'end': 2.83, 'paused': False},\n     {'name': 'exp1', 'start': 0, 'end': 100, 'paused': True},\n     {'name': 'exp2', 'start': 28.2, 'end': 28.4, 'paused': False}]],\n   [283, None]),\n  ('layer sample 48',\n   ['layer-a',\n    'u431',\n    [{'name': 'exp0', 'start': 0, 'end': 100, 'paused': False},\n     {'name': 'exp1', 'start': 20.0, 'end': 20.2, 'paused': True}]],\n   [201, 'exp0'])],\n [('paused range reserves its users',\n   ['layer-a',\n    'alice',\n    [{'name': 'x', 'start': 0, 'end': 100, 'paused': True}, {'name': 'y', 'start': 0, 'end': 100}]],\n   [988, None]),\n  ('first listed overlapping range wins',\n   ['layer-b',\n    'bob',\n    [{'name': 'wide', 'start': 0, 'end': 100}, {'name': 'narrow', 'start': 30.9, 'end': 31.0}]],\n   [309, 'wide']),\n  ('percent bounds convert to permille',\n   ['layer-a', 'alice', [{'name': 'x', 'start': 98.3, 'end': 99.3}]],\n   [988, 'x']),\n  ('no range matches', ['layer-b', 'bob', [{'name': 'x', 'start': 0, 'end': 0}]], [309, None]),\n  ('empty experiment list', ['layer-a', 'carol', []], [970, None]),\n  ('layer sample 11',\n   ['layer-b',\n    'u3995',\n    [{'name': 'exp0', 'start': 50, 'end': 84.5, 'paused': True},\n     {'name': 'exp1', 'start': 8.45, 'end': 84.5, 'paused': True}]],\n   [845, None]),\n  ('layer sample 39',\n   ['layer-b',\n    'u2441',\n    [{'name': 'exp0', 'start': 0, 'end': 75.8, 'paused': False},\n     {'name': 'exp1', 'start': 43.8, 'end': 100, 'paused': False}]],\n   [439, 'exp0']),\n  ('layer sample 47',\n   ['layer-b',\n    'u2172',\n    [{'name': 'exp0', 'start': 89.1, 'end': 89.3, 'paused': False},\n     {'name': 'exp1', 'start': 89.1, 'end': 100, 'paused': False}]],\n   [892, 'exp0'])],\n [('bucket at range end belongs to next range',\n   ['layer-a', 'alice', [{'name': 'x', 'start': 0, 'end': 98.8}, {'name': 'y', 'start': 98.8, 'end': 100}]],\n   [988, 'y']),\n  ('first listed overlapping range wins',\n   ['layer-b',\n    'bob',\n    [{'name': 'wide', 'start': 0, 'end': 100}, {'name': 'narrow', 'start': 30.9, 'end': 31.0}]],\n   [309, 'wide']),\n  ('percent bounds convert to permille',\n   ['layer-a', 'alice', [{'name': 'x', 'start': 98.3, 'end': 99.3}]],\n   [988, 'x']),\n  ('no range matches', ['layer-b', 'bob', [{'name': 'x', 'start': 0, 'end': 0}]], [309, None]),\n  ('empty experiment list', ['layer-a', 'carol', []], [970, None]),\n  ('layer sample 4',\n   ['layer-a',\n    'u309',\n    [{'name': 'exp0', 'start': 6.0, 'end': 50, 'paused': False},\n     {'name': 'exp1', 'start': 0, 'end': 5.9, 'paused': False},\n     {'name': 'exp2', 'start': 6.0, 'end': 50, 'paused': False}]],\n   [60, 'exp0']),\n  ('layer sample 16',\n   ['layer-a',\n    'u4745',\n    [{'name': 'exp0', 'start': 81.9, 'end': 100, 'paused': True},\n     {'name': 'exp1', 'start': 8.19, 'end': 82.0, 'paused': True},\n     {'name': 'exp2', 'start': 50, 'end': 82.0, 'paused': False}]],\n   [819, None]),\n  ('layer sample 28',\n   ['layer-a',\n    'u2535',\n    [{'name': 'exp0', 'start': 5.59, 'end': 56.0, 'paused': False},\n     {'name': 'exp1', 'start': 5.59, 'end': 100, 'paused': False},\n     {'name': 'exp2', 'start': 52.4, 'end': 100, 'paused': False}]],\n   [559, 'exp0'])],\n [('bucket at range end belongs to next range',\n   ['layer-a', 'alice', [{'name': 'x', 'start': 0, 'end': 98.8}, {'name': 'y', 'start': 98.8, 'end': 100}]],\n   [988, 'y']),\n  ('bucket at range start is included',\n   ['layer-b', 'bob', [{'name': 'x', 'start': 30.9, 'end': 100}]],\n   [309, 'x']),\n  ('percent bounds convert to permille',\n   ['layer-a', 'alice', [{'name': 'x', 'start': 98.3, 'end': 99.3}]],\n   [988, 'x']),\n  ('no range matches', ['layer-b', 'bob', [{'name': 'x', 'start': 0, 'end': 0}]], [309, None]),\n  ('empty experiment list', ['layer-a', 'carol', []], [970, None]),\n  ('layer sample 14',\n   ['layer-b',\n    'u1256',\n    [{'name': 'exp0', 'start': 50, 'end': 89.8, 'paused': False},\n     {'name': 'exp1', 'start': 89.7, 'end': 89.8, 'paused': False}]],\n   [897, 'exp0']),\n  ('layer sample 21',\n   ['layer-a',\n    'u505',\n    [{'name': 'exp0', 'start': 0, 'end': 100, 'paused': False},\n     {'name': 'exp1', 'start': 54.1, 'end': 100, 'paused': False}]],\n   [540, 'exp0']),\n  ('layer sample 38',\n   ['layer-a',\n    'u4816',\n    [{'name': 'exp0', 'start': 48.1, 'end': 65.6, 'paused': False},\n     {'name': 'exp1', 'start': 0, 'end': 65.6, 'paused': False}]],\n   [655, 'exp0'])]]\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 flag-evaluation model with a stipulated contract; it does not reproduce any vendor SDK byte for byte. 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-feature-flag-rollout-bucketing-exclusive-layer-overlap-resolution","generated_at":"2026-09-29T14:48:53.253971+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"Layers keep concurrent experiments from overlapping on the same users.","root_cause":"The loop keeps overwriting its result instead of stopping at the first containing range.","sha256":"54227b2834ccf48c7f9ee0f1ab4414bd86434822ec17a8200dbc3e7a35b6f77b","title":"Mutually exclusive layer allocation: The last overlapping range wins · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verified":true,"visibility":"public","verification":{"attempt":{"elapsed_ms":43.659,"exit_code":1,"observations":[{"actual":[988,"y"],"check":"bucket at range end belongs to next range","expected":[988,"y"],"passed":true},{"actual":[309,"x"],"check":"bucket at range start is included","expected":[309,"x"],"passed":true},{"actual":[988,null],"check":"paused range reserves its users","expected":[988,null],"passed":true},{"actual":[309,"narrow"],"check":"first listed overlapping range wins","expected":[309,"wide"],"passed":false},{"actual":[988,"x"],"check":"percent bounds convert to permille","expected":[988,"x"],"passed":true},{"actual":[576,"exp0"],"check":"layer sample 1","expected":[576,"exp0"],"passed":true},{"actual":[750,null],"check":"layer sample 2","expected":[750,null],"passed":true},{"actual":[172,"exp0"],"check":"layer sample 3","expected":[172,"exp0"],"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"bucket at range end belongs to next range\", \"actual\": [988, \"y\"], \"expected\": [988, \"y\"], \"passed\": true}, {\"check\": \"bucket at range start is included\", \"actual\": [309, \"x\"], \"expected\": [309, \"x\"], \"passed\": true}, {\"check\": \"paused range reserves its users\", \"actual\": [988, null], \"expected\": [988, null], \"passed\": true}, {\"check\": \"first listed overlapping range wins\", \"actual\": [309, \"narrow\"], \"expected\": [309, \"wide\"], \"passed\": false}, {\"check\": \"percent bounds convert to permille\", \"actual\": [988, \"x\"], \"expected\": [988, \"x\"], \"passed\": true}, {\"check\": \"layer sample 1\", \"actual\": [576, \"exp0\"], \"expected\": [576, \"exp0\"], \"passed\": true}, {\"check\": \"layer sample 2\", \"actual\": [750, null], \"expected\": [750, null], \"passed\": true}, {\"check\": \"layer sample 3\", \"actual\": [172, \"exp0\"], \"expected\": [172, \"exp0\"], \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":40.416,"exit_code":1,"observations":[{"actual":[988,"y"],"check":"bucket at range end belongs to next range","expected":[988,"y"],"passed":true},{"actual":[309,"x"],"check":"bucket at range start is included","expected":[309,"x"],"passed":true},{"actual":[988,"y"],"check":"paused range reserves its users","expected":[988,null],"passed":false},{"actual":[309,"narrow"],"check":"first listed overlapping range wins","expected":[309,"wide"],"passed":false},{"actual":[988,"x"],"check":"percent bounds convert to permille","expected":[988,"x"],"passed":true},{"actual":[576,"exp1"],"check":"layer sample 1","expected":[576,"exp0"],"passed":false},{"actual":[750,null],"check":"layer sample 2","expected":[750,null],"passed":true},{"actual":[172,null],"check":"layer sample 3","expected":[172,"exp0"],"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"bucket at range end belongs to next range\", \"actual\": [988, \"y\"], \"expected\": [988, \"y\"], \"passed\": true}, {\"check\": \"bucket at range start is included\", \"actual\": [309, \"x\"], \"expected\": [309, \"x\"], \"passed\": true}, {\"check\": \"paused range reserves its users\", \"actual\": [988, \"y\"], \"expected\": [988, null], \"passed\": false}, {\"check\": \"first listed overlapping range wins\", \"actual\": [309, \"narrow\"], \"expected\": [309, \"wide\"], \"passed\": false}, {\"check\": \"percent bounds convert to permille\", \"actual\": [988, \"x\"], \"expected\": [988, \"x\"], \"passed\": true}, {\"check\": \"layer sample 1\", \"actual\": [576, \"exp1\"], \"expected\": [576, \"exp0\"], \"passed\": false}, {\"check\": \"layer sample 2\", \"actual\": [750, null], \"expected\": [750, null], \"passed\": true}, {\"check\": \"layer sample 3\", \"actual\": [172, null], \"expected\": [172, \"exp0\"], \"passed\": false}], \"passed\": false}\n"}},"member_only":{"stages":["fixed"],"fields":["implementations.fixed","verification.fixed","harness","repair"],"note":"The verified repair, its recorded checks, the repair description, and the scoring harness are available to members."}}