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FA-24951 / Filter interfaces / Open access

Only an empty membership list triggers the empty-set validation · case 01

Only an empty membership list triggers the empty-set validation is violated by the widget projection.

Verified by executionVariant 1 · 10 checks per implementationDownload source bundle ↓JSON ↗

ROOT CAUSE

The empty-set-error decision uses `d['value']==[]` instead of the stipulated operator-editor projection.

THE FAILURE

The empty-set-error decision uses `d['value']==[]` instead of the stipulated operator-editor projection.

Unsuccessful approach: The attempted correction `d['op']=='in' and not d['value']` still violates the explicit contract fixtures.

Case contract

The stipulated filter editor supports equality, set membership and unary presence operators; switching operator updates operand arity rather than executing a query. This example checks: Only an empty membership list triggers the empty-set validation.

Why this case matters

Filter-widget state and serialization must preserve user constraints while the view changes.

1 / The failure

Exit 1
"""Failure Map reference implementation. Python standard library only."""
import json

N = 1
observations = []
def solve(d):
    return {'unary-value':(None if d['op'] in ('exists','missing') else d['value']), 'set-arity':([d['value']] if d['op']=='in' and not isinstance(d['value'],list) else d['value']), 'scalar-arity':((d['value'][0] if d['value'] else None) if d['op']=='eq' and isinstance(d['value'],list) else d['value']), 'editor-visible':(d['op'] not in ('exists','missing')), 'empty-set-error':(d['value']==[]), 'null-equality':(d['op']=='eq' and d['value'] is None)}
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = {1: [({'op': 'eq', 'value': []}, {'unary-value': [], 'set-arity': [], 'scalar-arity': None, 'editor-visible': True, 'empty-set-error': False, 'null-equality': False}), ({'op': 'in', 'value': None}, {'unary-value': None, 'set-arity': [None], 'scalar-arity': None, 'editor-visible': True, 'empty-set-error': False, 'null-equality': False}), ({'op': 'in', 'value': 0}, {'unary-value': 0, 'set-arity': [0], 'scalar-arity': 0, 'editor-visible': True, 'empty-set-error': False, 'null-equality': False}), ({'op': 'in', 'value': []}, {'unary-value': [], 'set-arity': [], 'scalar-arity': [], 'editor-visible': True, 'empty-set-error': True, 'null-equality': False}), ({'op': 'in', 'value': ['x', 'y']}, {'unary-value': ['x', 'y'], 'set-arity': ['x', 'y'], 'scalar-arity': ['x', 'y'], 'editor-visible': True, 'empty-set-error': False, 'null-equality': False}), ({'op': 'exists', 'value': ''}, {'unary-value': None, 'set-arity': '', 'scalar-arity': '', 'editor-visible': False, 'empty-set-error': False, 'null-equality': False}), ({'op': 'exists', 'value': 'x'}, {'unary-value': None, 'set-arity': 'x', 'scalar-arity': 'x', 'editor-visible': False, 'empty-set-error': False, 'null-equality': False}), ({'op': 'exists', 'value': ['x']}, {'unary-value': None, 'set-arity': ['x'], 'scalar-arity': ['x'], 'editor-visible': False, 'empty-set-error': False, 'null-equality': False}), ({'op': 'missing', 'value': None}, {'unary-value': None, 'set-arity': None, 'scalar-arity': None, 'editor-visible': False, 'empty-set-error': False, 'null-equality': False}), ({'op': 'missing', 'value': 0}, {'unary-value': None, 'set-arity': 0, 'scalar-arity': 0, 'editor-visible': False, 'empty-set-error': False, 'null-equality': False})], 2: [({'op': 'exists', 'value': []}, {'unary-value': None, 'set-arity': [], 'scalar-arity': [], 'editor-visible': False, 'empty-set-error': False, 'null-equality': False}), ({'op': 'in', 'value': None}, {'unary-value': None, 'set-arity': [None], 'scalar-arity': None, 'editor-visible': True, 'empty-set-error': False, 'null-equality': False}), ({'op': 'exists', 'value': None}, {'unary-value': None, 'set-arity': None, 'scalar-arity': None, 'editor-visible': False, 'empty-set-error': False, 'null-equality': False}), ({'op': 'exists', 'value': 0}, {'unary-value': None, 'set-arity': 0, 'scalar-arity': 0, 'editor-visible': False, 'empty-set-error': False, 'null-equality': False}), ({'op': 'exists', 'value': ['x', 'y']}, {'unary-value': None, 'set-arity': ['x', 'y'], 'scalar-arity': ['x', 'y'], 'editor-visible': False, 'empty-set-error': False, 'null-equality': False}), ({'op': 'missing', 'value': ''}, {'unary-value': None, 'set-arity': '', 'scalar-arity': '', 'editor-visible': False, 'empty-set-error': False, 'null-equality': False}), ({'op': 'missing', 'value': 'x'}, {'unary-value': None, 'set-arity': 'x', 'scalar-arity': 'x', 'editor-visible': False, 'empty-set-error': False, 'null-equality': False}), ({'op': 'missing', 'value': ['x']}, {'unary-value': None, 'set-arity': ['x'], 'scalar-arity': ['x'], 'editor-visible': False, 'empty-set-error': False, 'null-equality': False}), ({'op': 'eq', 'value': None}, {'unary-value': None, 'set-arity': None, 'scalar-arity': None, 'editor-visible': True, 'empty-set-error': False, 'null-equality': True}), ({'op': 'eq', 'value': 0}, {'unary-value': 0, 'set-arity': 0, 'scalar-arity': 0, 'editor-visible': True, 'empty-set-error': False, 'null-equality': False})], 3: [({'op': 'missing', 'value': []}, {'unary-value': None, 'set-arity': [], 'scalar-arity': [], 'editor-visible': False, 'empty-set-error': False, 'null-equality': False}), ({'op': 'in', 'value': None}, {'unary-value': None, 'set-arity': [None], 'scalar-arity': None, 'editor-visible': True, 'empty-set-error': False, 'null-equality': False}), ({'op': 'missing', 'value': None}, {'unary-value': None, 'set-arity': None, 'scalar-arity': None, 'editor-visible': False, 'empty-set-error': False, 'null-equality': False}), ({'op': 'missing', 'value': 0}, {'unary-value': None, 'set-arity': 0, 'scalar-arity': 0, 'editor-visible': False, 'empty-set-error': False, 'null-equality': False}), ({'op': 'missing', 'value': ['x', 'y']}, {'unary-value': None, 'set-arity': ['x', 'y'], 'scalar-arity': ['x', 'y'], 'editor-visible': False, 'empty-set-error': False, 'null-equality': False}), ({'op': 'eq', 'value': ''}, {'unary-value': '', 'set-arity': '', 'scalar-arity': '', 'editor-visible': True, 'empty-set-error': False, 'null-equality': False}), ({'op': 'eq', 'value': 'x'}, {'unary-value': 'x', 'set-arity': 'x', 'scalar-arity': 'x', 'editor-visible': True, 'empty-set-error': False, 'null-equality': False}), ({'op': 'eq', 'value': ['x']}, {'unary-value': ['x'], 'set-arity': ['x'], 'scalar-arity': 'x', 'editor-visible': True, 'empty-set-error': False, 'null-equality': False}), ({'op': 'in', 'value': 0}, {'unary-value': 0, 'set-arity': [0], 'scalar-arity': 0, 'editor-visible': True, 'empty-set-error': False, 'null-equality': False}), ({'op': 'in', 'value': []}, {'unary-value': [], 'set-arity': [], 'scalar-arity': [], 'editor-visible': True, 'empty-set-error': True, 'null-equality': False})], 4: [({'op': 'eq', 'value': []}, {'unary-value': [], 'set-arity': [], 'scalar-arity': None, 'editor-visible': True, 'empty-set-error': False, 'null-equality': False}), ({'op': 'in', 'value': None}, {'unary-value': None, 'set-arity': [None], 'scalar-arity': None, 'editor-visible': True, 'empty-set-error': False, 'null-equality': False}), ({'op': 'eq', 'value': None}, {'unary-value': None, 'set-arity': None, 'scalar-arity': None, 'editor-visible': True, 'empty-set-error': False, 'null-equality': True}), ({'op': 'eq', 'value': 0}, {'unary-value': 0, 'set-arity': 0, 'scalar-arity': 0, 'editor-visible': True, 'empty-set-error': False, 'null-equality': False}), ({'op': 'eq', 'value': ['x', 'y']}, {'unary-value': ['x', 'y'], 'set-arity': ['x', 'y'], 'scalar-arity': 'x', 'editor-visible': True, 'empty-set-error': False, 'null-equality': False}), ({'op': 'in', 'value': ''}, {'unary-value': '', 'set-arity': [''], 'scalar-arity': '', 'editor-visible': True, 'empty-set-error': False, 'null-equality': False}), ({'op': 'in', 'value': 'x'}, {'unary-value': 'x', 'set-arity': ['x'], 'scalar-arity': 'x', 'editor-visible': True, 'empty-set-error': False, 'null-equality': False}), ({'op': 'in', 'value': ['x']}, {'unary-value': ['x'], 'set-arity': ['x'], 'scalar-arity': ['x'], 'editor-visible': True, 'empty-set-error': False, 'null-equality': False}), ({'op': 'exists', 'value': None}, {'unary-value': None, 'set-arity': None, 'scalar-arity': None, 'editor-visible': False, 'empty-set-error': False, 'null-equality': False}), ({'op': 'exists', 'value': 0}, {'unary-value': None, 'set-arity': 0, 'scalar-arity': 0, 'editor-visible': False, 'empty-set-error': False, 'null-equality': False})], 5: [({'op': 'exists', 'value': []}, {'unary-value': None, 'set-arity': [], 'scalar-arity': [], 'editor-visible': False, 'empty-set-error': False, 'null-equality': False}), ({'op': 'in', 'value': None}, {'unary-value': None, 'set-arity': [None], 'scalar-arity': None, 'editor-visible': True, 'empty-set-error': False, 'null-equality': False}), ({'op': 'in', 'value': 0}, {'unary-value': 0, 'set-arity': [0], 'scalar-arity': 0, 'editor-visible': True, 'empty-set-error': False, 'null-equality': False}), ({'op': 'in', 'value': []}, {'unary-value': [], 'set-arity': [], 'scalar-arity': [], 'editor-visible': True, 'empty-set-error': True, 'null-equality': False}), ({'op': 'in', 'value': ['x', 'y']}, {'unary-value': ['x', 'y'], 'set-arity': ['x', 'y'], 'scalar-arity': ['x', 'y'], 'editor-visible': True, 'empty-set-error': False, 'null-equality': False}), ({'op': 'exists', 'value': ''}, {'unary-value': None, 'set-arity': '', 'scalar-arity': '', 'editor-visible': False, 'empty-set-error': False, 'null-equality': False}), ({'op': 'exists', 'value': 'x'}, {'unary-value': None, 'set-arity': 'x', 'scalar-arity': 'x', 'editor-visible': False, 'empty-set-error': False, 'null-equality': False}), ({'op': 'exists', 'value': ['x']}, {'unary-value': None, 'set-arity': ['x'], 'scalar-arity': ['x'], 'editor-visible': False, 'empty-set-error': False, 'null-equality': False}), ({'op': 'missing', 'value': None}, {'unary-value': None, 'set-arity': None, 'scalar-arity': None, 'editor-visible': False, 'empty-set-error': False, 'null-equality': False}), ({'op': 'missing', 'value': 0}, {'unary-value': None, 'set-arity': 0, 'scalar-arity': 0, 'editor-visible': False, 'empty-set-error': False, 'null-equality': False})]}
for index, (data, expected) in enumerate(fixtures[N]):
    check("contract fixture " + str(index), solve(data), expected)
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)
Boundary fixtureActualExpectedOutcome
contract fixture 0{'editor-visible': True, 'empty-set-error': True, 'null-equality': False, 'scalar-arity': None, 'set-arity': [], 'unary-value': []}{'editor-visible': True, 'empty-set-error': False, 'null-equality': False, 'scalar-arity': None, 'set-arity': [], 'unary-value': []}Failed
contract fixture 1{'editor-visible': True, 'empty-set-error': False, 'null-equality': False, 'scalar-arity': None, 'set-arity': [None], 'unary-value': None}{'editor-visible': True, 'empty-set-error': False, 'null-equality': False, 'scalar-arity': None, 'set-arity': [None], 'unary-value': None}Passed
contract fixture 2{'editor-visible': True, 'empty-set-error': False, 'null-equality': False, 'scalar-arity': 0, 'set-arity': [0], 'unary-value': 0}{'editor-visible': True, 'empty-set-error': False, 'null-equality': False, 'scalar-arity': 0, 'set-arity': [0], 'unary-value': 0}Passed
contract fixture 3{'editor-visible': True, 'empty-set-error': True, 'null-equality': False, 'scalar-arity': [], 'set-arity': [], 'unary-value': []}{'editor-visible': True, 'empty-set-error': True, 'null-equality': False, 'scalar-arity': [], 'set-arity': [], 'unary-value': []}Passed
contract fixture 4{'editor-visible': True, 'empty-set-error': False, 'null-equality': False, 'scalar-arity': ['x', 'y'], 'set-arity': ['x', 'y'], 'unary-value': ['x', 'y']}{'editor-visible': True, 'empty-set-error': False, 'null-equality': False, 'scalar-arity': ['x', 'y'], 'set-arity': ['x', 'y'], 'unary-value': ['x', 'y']}Passed
contract fixture 5{'editor-visible': False, 'empty-set-error': False, 'null-equality': False, 'scalar-arity': '', 'set-arity': '', 'unary-value': None}{'editor-visible': False, 'empty-set-error': False, 'null-equality': False, 'scalar-arity': '', 'set-arity': '', 'unary-value': None}Passed
contract fixture 6{'editor-visible': False, 'empty-set-error': False, 'null-equality': False, 'scalar-arity': 'x', 'set-arity': 'x', 'unary-value': None}{'editor-visible': False, 'empty-set-error': False, 'null-equality': False, 'scalar-arity': 'x', 'set-arity': 'x', 'unary-value': None}Passed
contract fixture 7{'editor-visible': False, 'empty-set-error': False, 'null-equality': False, 'scalar-arity': ['x'], 'set-arity': ['x'], 'unary-value': None}{'editor-visible': False, 'empty-set-error': False, 'null-equality': False, 'scalar-arity': ['x'], 'set-arity': ['x'], 'unary-value': None}Passed
contract fixture 8{'editor-visible': False, 'empty-set-error': False, 'null-equality': False, 'scalar-arity': None, 'set-arity': None, 'unary-value': None}{'editor-visible': False, 'empty-set-error': False, 'null-equality': False, 'scalar-arity': None, 'set-arity': None, 'unary-value': None}Passed
contract fixture 9{'editor-visible': False, 'empty-set-error': False, 'null-equality': False, 'scalar-arity': 0, 'set-arity': 0, 'unary-value': None}{'editor-visible': False, 'empty-set-error': False, 'null-equality': False, 'scalar-arity': 0, 'set-arity': 0, 'unary-value': None}Passed

SHA-256 / 81f8fe9bc5f454dbb0bb1e9cc3bbe2b1c99878f0a1b5589876f97ddb28c66c86

2 / The unsuccessful fix

Exit 1
"""Failure Map reference implementation. Python standard library only."""
import json

N = 1
observations = []
def solve(d):
    return {'unary-value':(None if d['op'] in ('exists','missing') else d['value']), 'set-arity':([d['value']] if d['op']=='in' and not isinstance(d['value'],list) else d['value']), 'scalar-arity':((d['value'][0] if d['value'] else None) if d['op']=='eq' and isinstance(d['value'],list) else d['value']), 'editor-visible':(d['op'] not in ('exists','missing')), 'empty-set-error':(d['op']=='in' and not d['value']), 'null-equality':(d['op']=='eq' and d['value'] is None)}
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = {1: [({'op': 'eq', 'value': []}, {'unary-value': [], 'set-arity': [], 'scalar-arity': None, 'editor-visible': True, 'empty-set-error': False, 'null-equality': False}), ({'op': 'in', 'value': None}, {'unary-value': None, 'set-arity': [None], 'scalar-arity': None, 'editor-visible': True, 'empty-set-error': False, 'null-equality': False}), ({'op': 'in', 'value': 0}, {'unary-value': 0, 'set-arity': [0], 'scalar-arity': 0, 'editor-visible': True, 'empty-set-error': False, 'null-equality': False}), ({'op': 'in', 'value': []}, {'unary-value': [], 'set-arity': [], 'scalar-arity': [], 'editor-visible': True, 'empty-set-error': True, 'null-equality': False}), ({'op': 'in', 'value': ['x', 'y']}, {'unary-value': ['x', 'y'], 'set-arity': ['x', 'y'], 'scalar-arity': ['x', 'y'], 'editor-visible': True, 'empty-set-error': False, 'null-equality': False}), ({'op': 'exists', 'value': ''}, {'unary-value': None, 'set-arity': '', 'scalar-arity': '', 'editor-visible': False, 'empty-set-error': False, 'null-equality': False}), ({'op': 'exists', 'value': 'x'}, {'unary-value': None, 'set-arity': 'x', 'scalar-arity': 'x', 'editor-visible': False, 'empty-set-error': False, 'null-equality': False}), ({'op': 'exists', 'value': ['x']}, {'unary-value': None, 'set-arity': ['x'], 'scalar-arity': ['x'], 'editor-visible': False, 'empty-set-error': False, 'null-equality': False}), ({'op': 'missing', 'value': None}, {'unary-value': None, 'set-arity': None, 'scalar-arity': None, 'editor-visible': False, 'empty-set-error': False, 'null-equality': False}), ({'op': 'missing', 'value': 0}, {'unary-value': None, 'set-arity': 0, 'scalar-arity': 0, 'editor-visible': False, 'empty-set-error': False, 'null-equality': False})], 2: [({'op': 'exists', 'value': []}, {'unary-value': None, 'set-arity': [], 'scalar-arity': [], 'editor-visible': False, 'empty-set-error': False, 'null-equality': False}), ({'op': 'in', 'value': None}, {'unary-value': None, 'set-arity': [None], 'scalar-arity': None, 'editor-visible': True, 'empty-set-error': False, 'null-equality': False}), ({'op': 'exists', 'value': None}, {'unary-value': None, 'set-arity': None, 'scalar-arity': None, 'editor-visible': False, 'empty-set-error': False, 'null-equality': False}), ({'op': 'exists', 'value': 0}, {'unary-value': None, 'set-arity': 0, 'scalar-arity': 0, 'editor-visible': False, 'empty-set-error': False, 'null-equality': False}), ({'op': 'exists', 'value': ['x', 'y']}, {'unary-value': None, 'set-arity': ['x', 'y'], 'scalar-arity': ['x', 'y'], 'editor-visible': False, 'empty-set-error': False, 'null-equality': False}), ({'op': 'missing', 'value': ''}, {'unary-value': None, 'set-arity': '', 'scalar-arity': '', 'editor-visible': False, 'empty-set-error': False, 'null-equality': False}), ({'op': 'missing', 'value': 'x'}, {'unary-value': None, 'set-arity': 'x', 'scalar-arity': 'x', 'editor-visible': False, 'empty-set-error': False, 'null-equality': False}), ({'op': 'missing', 'value': ['x']}, {'unary-value': None, 'set-arity': ['x'], 'scalar-arity': ['x'], 'editor-visible': False, 'empty-set-error': False, 'null-equality': False}), ({'op': 'eq', 'value': None}, {'unary-value': None, 'set-arity': None, 'scalar-arity': None, 'editor-visible': True, 'empty-set-error': False, 'null-equality': True}), ({'op': 'eq', 'value': 0}, {'unary-value': 0, 'set-arity': 0, 'scalar-arity': 0, 'editor-visible': True, 'empty-set-error': False, 'null-equality': False})], 3: [({'op': 'missing', 'value': []}, {'unary-value': None, 'set-arity': [], 'scalar-arity': [], 'editor-visible': False, 'empty-set-error': False, 'null-equality': False}), ({'op': 'in', 'value': None}, {'unary-value': None, 'set-arity': [None], 'scalar-arity': None, 'editor-visible': True, 'empty-set-error': False, 'null-equality': False}), ({'op': 'missing', 'value': None}, {'unary-value': None, 'set-arity': None, 'scalar-arity': None, 'editor-visible': False, 'empty-set-error': False, 'null-equality': False}), ({'op': 'missing', 'value': 0}, {'unary-value': None, 'set-arity': 0, 'scalar-arity': 0, 'editor-visible': False, 'empty-set-error': False, 'null-equality': False}), ({'op': 'missing', 'value': ['x', 'y']}, {'unary-value': None, 'set-arity': ['x', 'y'], 'scalar-arity': ['x', 'y'], 'editor-visible': False, 'empty-set-error': False, 'null-equality': False}), ({'op': 'eq', 'value': ''}, {'unary-value': '', 'set-arity': '', 'scalar-arity': '', 'editor-visible': True, 'empty-set-error': False, 'null-equality': False}), ({'op': 'eq', 'value': 'x'}, {'unary-value': 'x', 'set-arity': 'x', 'scalar-arity': 'x', 'editor-visible': True, 'empty-set-error': False, 'null-equality': False}), ({'op': 'eq', 'value': ['x']}, {'unary-value': ['x'], 'set-arity': ['x'], 'scalar-arity': 'x', 'editor-visible': True, 'empty-set-error': False, 'null-equality': False}), ({'op': 'in', 'value': 0}, {'unary-value': 0, 'set-arity': [0], 'scalar-arity': 0, 'editor-visible': True, 'empty-set-error': False, 'null-equality': False}), ({'op': 'in', 'value': []}, {'unary-value': [], 'set-arity': [], 'scalar-arity': [], 'editor-visible': True, 'empty-set-error': True, 'null-equality': False})], 4: [({'op': 'eq', 'value': []}, {'unary-value': [], 'set-arity': [], 'scalar-arity': None, 'editor-visible': True, 'empty-set-error': False, 'null-equality': False}), ({'op': 'in', 'value': None}, {'unary-value': None, 'set-arity': [None], 'scalar-arity': None, 'editor-visible': True, 'empty-set-error': False, 'null-equality': False}), ({'op': 'eq', 'value': None}, {'unary-value': None, 'set-arity': None, 'scalar-arity': None, 'editor-visible': True, 'empty-set-error': False, 'null-equality': True}), ({'op': 'eq', 'value': 0}, {'unary-value': 0, 'set-arity': 0, 'scalar-arity': 0, 'editor-visible': True, 'empty-set-error': False, 'null-equality': False}), ({'op': 'eq', 'value': ['x', 'y']}, {'unary-value': ['x', 'y'], 'set-arity': ['x', 'y'], 'scalar-arity': 'x', 'editor-visible': True, 'empty-set-error': False, 'null-equality': False}), ({'op': 'in', 'value': ''}, {'unary-value': '', 'set-arity': [''], 'scalar-arity': '', 'editor-visible': True, 'empty-set-error': False, 'null-equality': False}), ({'op': 'in', 'value': 'x'}, {'unary-value': 'x', 'set-arity': ['x'], 'scalar-arity': 'x', 'editor-visible': True, 'empty-set-error': False, 'null-equality': False}), ({'op': 'in', 'value': ['x']}, {'unary-value': ['x'], 'set-arity': ['x'], 'scalar-arity': ['x'], 'editor-visible': True, 'empty-set-error': False, 'null-equality': False}), ({'op': 'exists', 'value': None}, {'unary-value': None, 'set-arity': None, 'scalar-arity': None, 'editor-visible': False, 'empty-set-error': False, 'null-equality': False}), ({'op': 'exists', 'value': 0}, {'unary-value': None, 'set-arity': 0, 'scalar-arity': 0, 'editor-visible': False, 'empty-set-error': False, 'null-equality': False})], 5: [({'op': 'exists', 'value': []}, {'unary-value': None, 'set-arity': [], 'scalar-arity': [], 'editor-visible': False, 'empty-set-error': False, 'null-equality': False}), ({'op': 'in', 'value': None}, {'unary-value': None, 'set-arity': [None], 'scalar-arity': None, 'editor-visible': True, 'empty-set-error': False, 'null-equality': False}), ({'op': 'in', 'value': 0}, {'unary-value': 0, 'set-arity': [0], 'scalar-arity': 0, 'editor-visible': True, 'empty-set-error': False, 'null-equality': False}), ({'op': 'in', 'value': []}, {'unary-value': [], 'set-arity': [], 'scalar-arity': [], 'editor-visible': True, 'empty-set-error': True, 'null-equality': False}), ({'op': 'in', 'value': ['x', 'y']}, {'unary-value': ['x', 'y'], 'set-arity': ['x', 'y'], 'scalar-arity': ['x', 'y'], 'editor-visible': True, 'empty-set-error': False, 'null-equality': False}), ({'op': 'exists', 'value': ''}, {'unary-value': None, 'set-arity': '', 'scalar-arity': '', 'editor-visible': False, 'empty-set-error': False, 'null-equality': False}), ({'op': 'exists', 'value': 'x'}, {'unary-value': None, 'set-arity': 'x', 'scalar-arity': 'x', 'editor-visible': False, 'empty-set-error': False, 'null-equality': False}), ({'op': 'exists', 'value': ['x']}, {'unary-value': None, 'set-arity': ['x'], 'scalar-arity': ['x'], 'editor-visible': False, 'empty-set-error': False, 'null-equality': False}), ({'op': 'missing', 'value': None}, {'unary-value': None, 'set-arity': None, 'scalar-arity': None, 'editor-visible': False, 'empty-set-error': False, 'null-equality': False}), ({'op': 'missing', 'value': 0}, {'unary-value': None, 'set-arity': 0, 'scalar-arity': 0, 'editor-visible': False, 'empty-set-error': False, 'null-equality': False})]}
for index, (data, expected) in enumerate(fixtures[N]):
    check("contract fixture " + str(index), solve(data), expected)
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)
Boundary fixtureActualExpectedOutcome
contract fixture 0{'editor-visible': True, 'empty-set-error': False, 'null-equality': False, 'scalar-arity': None, 'set-arity': [], 'unary-value': []}{'editor-visible': True, 'empty-set-error': False, 'null-equality': False, 'scalar-arity': None, 'set-arity': [], 'unary-value': []}Passed
contract fixture 1{'editor-visible': True, 'empty-set-error': True, 'null-equality': False, 'scalar-arity': None, 'set-arity': [None], 'unary-value': None}{'editor-visible': True, 'empty-set-error': False, 'null-equality': False, 'scalar-arity': None, 'set-arity': [None], 'unary-value': None}Failed
contract fixture 2{'editor-visible': True, 'empty-set-error': True, 'null-equality': False, 'scalar-arity': 0, 'set-arity': [0], 'unary-value': 0}{'editor-visible': True, 'empty-set-error': False, 'null-equality': False, 'scalar-arity': 0, 'set-arity': [0], 'unary-value': 0}Failed
contract fixture 3{'editor-visible': True, 'empty-set-error': True, 'null-equality': False, 'scalar-arity': [], 'set-arity': [], 'unary-value': []}{'editor-visible': True, 'empty-set-error': True, 'null-equality': False, 'scalar-arity': [], 'set-arity': [], 'unary-value': []}Passed
contract fixture 4{'editor-visible': True, 'empty-set-error': False, 'null-equality': False, 'scalar-arity': ['x', 'y'], 'set-arity': ['x', 'y'], 'unary-value': ['x', 'y']}{'editor-visible': True, 'empty-set-error': False, 'null-equality': False, 'scalar-arity': ['x', 'y'], 'set-arity': ['x', 'y'], 'unary-value': ['x', 'y']}Passed
contract fixture 5{'editor-visible': False, 'empty-set-error': False, 'null-equality': False, 'scalar-arity': '', 'set-arity': '', 'unary-value': None}{'editor-visible': False, 'empty-set-error': False, 'null-equality': False, 'scalar-arity': '', 'set-arity': '', 'unary-value': None}Passed
contract fixture 6{'editor-visible': False, 'empty-set-error': False, 'null-equality': False, 'scalar-arity': 'x', 'set-arity': 'x', 'unary-value': None}{'editor-visible': False, 'empty-set-error': False, 'null-equality': False, 'scalar-arity': 'x', 'set-arity': 'x', 'unary-value': None}Passed
contract fixture 7{'editor-visible': False, 'empty-set-error': False, 'null-equality': False, 'scalar-arity': ['x'], 'set-arity': ['x'], 'unary-value': None}{'editor-visible': False, 'empty-set-error': False, 'null-equality': False, 'scalar-arity': ['x'], 'set-arity': ['x'], 'unary-value': None}Passed
contract fixture 8{'editor-visible': False, 'empty-set-error': False, 'null-equality': False, 'scalar-arity': None, 'set-arity': None, 'unary-value': None}{'editor-visible': False, 'empty-set-error': False, 'null-equality': False, 'scalar-arity': None, 'set-arity': None, 'unary-value': None}Passed
contract fixture 9{'editor-visible': False, 'empty-set-error': False, 'null-equality': False, 'scalar-arity': 0, 'set-arity': 0, 'unary-value': None}{'editor-visible': False, 'empty-set-error': False, 'null-equality': False, 'scalar-arity': 0, 'set-arity': 0, 'unary-value': None}Passed

SHA-256 / 038e2beca1d01e228c89658210e603d849d01eb770689bfedc3ef2dec32a6ff8

HELD IN THE MEMBER ARCHIVE

The verified repair and its recorded checks are member-only.

This mechanism has 10 recorded checks per implementation. The open-access tier publishes the failure and the unsuccessful fix; the repaired source that passes every check, and the observations that prove it, are available to members.

Every case sharing this mechanism uses the same contract and the same repair, so this one record is held back for all of them.

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Verification & scope

Deterministic bounded UI-state model only; no browser, query engine, network, or production-standard conformance is claimed. 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.

Observations recorded using Python 3.12.14 at 2026-09-29T14:41:02.249683+00:00.

Case digest / 892a3b381494ef0c2686333232b5cfb097f6036eb25b4ff53455c0cb84cbff10