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FA-50526 / Raster clipping / Open access

Clip mask cache: revision order test · case 01

Cache invalidation compares revisions in the wrong direction.

Verified by executionVariant 1 · 9 checks per implementationDownload source bundle ↓JSON ↗

ROOT CAUSE

Cache invalidation compares revisions in the wrong direction.

VERIFIED REPAIR

Apply the documented state transition at revision order test. Cache entries store copied coverage and source revisions. Draw recomputes after mask edits. Disable returns full coverage without overwriting cached mask. Rebinding to another name cannot reuse the old name; clearing definitions removes stale entries. Missing definitions clip empty.

Unsuccessful approach: Allowing a revision delta of one misses the first change after cache population.

Case contract

Cache entries store copied coverage and source revisions. Draw recomputes after mask edits. Disable returns full coverage without overwriting cached mask. Rebinding to another name cannot reuse the old name; clearing definitions removes stale entries. Missing definitions clip empty.

Why this case matters

Raster clip state can leak coverage across draws even when every individual region is valid.

1 / The failure

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

N = 1
observations = []
def solve(commands, size):
    full=set(range(size))
    defs={}
    revs={}
    cache={}
    active=None
    enabled=True
    out=[]
    for cmd in commands:
        op=cmd[0]
        if op=='set':
            defs[cmd[1]]=set(cmd[2]) & full
            revs[cmd[1]]=revs.get(cmd[1],0)+1
        elif op=='bind': active=cmd[1]
        elif op=='drop':
            defs.pop(cmd[1],None)
            cache.pop(cmd[1],None)
        elif op=='invalidate': cache.pop(cmd[1],None)
        elif op=='clear': defs.clear(); cache.clear()
        elif op=='disable': enabled=False
        elif op=='enable': enabled=True
        elif op=='draw':
            revision=revs.get(active,0)
            if active not in cache or cache[active][0]>revision:
                cache[active]=(revision,set(defs.get(active,set())))
            out.append(sorted(cache[active][1] if enabled else full))
    return out
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
if N == 1:
    check('explicit sequence 0', solve([['set', 'a', [0]], ['bind', 'a'], ['draw'], ['set', 'a', [1]], ['draw']], 4), [[0], [1]])
    check('explicit sequence 1', solve([['set', 'a', [0]], ['set', 'b', [2]], ['bind', 'b'], ['draw']], 4), [[2]])
    check('explicit sequence 2', solve([['set', 'a', [0]], ['bind', 'a'], ['draw'], ['drop', 'a'], ['draw']], 4), [[0], []])
    check('explicit sequence 3', solve([['set', 'a', [0]], ['bind', 'a'], ['draw'], ['clear'], ['draw']], 4), [[0], []])
    check('explicit sequence 4', solve([['set', 'a', [0]], ['bind', 'a'], ['draw'], ['disable'], ['draw'], ['enable'], ['draw']], 4), [[0], [0, 1, 2, 3], [0]])
    check('explicit sequence 5', solve([['bind', 'missing'], ['draw']], 4), [[]])
    check('explicit sequence 6', solve([['set', 'a', [0, 99]], ['bind', 'a'], ['draw'], ['invalidate', 'a'], ['draw']], 4), [[0], [0]])
    check('explicit sequence 7', solve([['set', 'a', []], ['bind', 'a'], ['draw']], 4), [[]])
    check('explicit sequence 8', solve([['set', 'a', [0]], ['set', 'b', [1]], ['bind', 'a'], ['draw'], ['drop', 'a'], ['draw']], 4), [[0], []])
if N == 2:
    check('explicit sequence 0', solve([['set', 'a', [0]], ['bind', 'a'], ['draw'], ['set', 'a', [1]], ['draw']], 5), [[0], [1]])
    check('explicit sequence 1', solve([['set', 'a', [0]], ['set', 'b', [2]], ['bind', 'b'], ['draw']], 5), [[2]])
    check('explicit sequence 2', solve([['set', 'a', [0]], ['bind', 'a'], ['draw'], ['drop', 'a'], ['draw']], 5), [[0], []])
    check('explicit sequence 3', solve([['set', 'a', [0]], ['bind', 'a'], ['draw'], ['clear'], ['draw']], 5), [[0], []])
    check('explicit sequence 4', solve([['set', 'a', [0]], ['bind', 'a'], ['draw'], ['disable'], ['draw'], ['enable'], ['draw']], 5), [[0], [0, 1, 2, 3, 4], [0]])
    check('explicit sequence 5', solve([['bind', 'missing'], ['draw']], 5), [[]])
    check('explicit sequence 6', solve([['set', 'a', [0, 99]], ['bind', 'a'], ['draw'], ['invalidate', 'a'], ['draw']], 5), [[0], [0]])
    check('explicit sequence 7', solve([['set', 'a', []], ['bind', 'a'], ['draw']], 5), [[]])
    check('explicit sequence 8', solve([['set', 'a', [0]], ['set', 'b', [1]], ['bind', 'a'], ['draw'], ['drop', 'a'], ['draw']], 5), [[0], []])
if N == 3:
    check('explicit sequence 0', solve([['set', 'a', [0]], ['bind', 'a'], ['draw'], ['set', 'a', [1]], ['draw']], 6), [[0], [1]])
    check('explicit sequence 1', solve([['set', 'a', [0]], ['set', 'b', [2]], ['bind', 'b'], ['draw']], 6), [[2]])
    check('explicit sequence 2', solve([['set', 'a', [0]], ['bind', 'a'], ['draw'], ['drop', 'a'], ['draw']], 6), [[0], []])
    check('explicit sequence 3', solve([['set', 'a', [0]], ['bind', 'a'], ['draw'], ['clear'], ['draw']], 6), [[0], []])
    check('explicit sequence 4', solve([['set', 'a', [0]], ['bind', 'a'], ['draw'], ['disable'], ['draw'], ['enable'], ['draw']], 6), [[0], [0, 1, 2, 3, 4, 5], [0]])
    check('explicit sequence 5', solve([['bind', 'missing'], ['draw']], 6), [[]])
    check('explicit sequence 6', solve([['set', 'a', [0, 99]], ['bind', 'a'], ['draw'], ['invalidate', 'a'], ['draw']], 6), [[0], [0]])
    check('explicit sequence 7', solve([['set', 'a', []], ['bind', 'a'], ['draw']], 6), [[]])
    check('explicit sequence 8', solve([['set', 'a', [0]], ['set', 'b', [1]], ['bind', 'a'], ['draw'], ['drop', 'a'], ['draw']], 6), [[0], []])
if N == 4:
    check('explicit sequence 0', solve([['set', 'a', [0]], ['bind', 'a'], ['draw'], ['set', 'a', [1]], ['draw']], 7), [[0], [1]])
    check('explicit sequence 1', solve([['set', 'a', [0]], ['set', 'b', [2]], ['bind', 'b'], ['draw']], 7), [[2]])
    check('explicit sequence 2', solve([['set', 'a', [0]], ['bind', 'a'], ['draw'], ['drop', 'a'], ['draw']], 7), [[0], []])
    check('explicit sequence 3', solve([['set', 'a', [0]], ['bind', 'a'], ['draw'], ['clear'], ['draw']], 7), [[0], []])
    check('explicit sequence 4', solve([['set', 'a', [0]], ['bind', 'a'], ['draw'], ['disable'], ['draw'], ['enable'], ['draw']], 7), [[0], [0, 1, 2, 3, 4, 5, 6], [0]])
    check('explicit sequence 5', solve([['bind', 'missing'], ['draw']], 7), [[]])
    check('explicit sequence 6', solve([['set', 'a', [0, 99]], ['bind', 'a'], ['draw'], ['invalidate', 'a'], ['draw']], 7), [[0], [0]])
    check('explicit sequence 7', solve([['set', 'a', []], ['bind', 'a'], ['draw']], 7), [[]])
    check('explicit sequence 8', solve([['set', 'a', [0]], ['set', 'b', [1]], ['bind', 'a'], ['draw'], ['drop', 'a'], ['draw']], 7), [[0], []])
if N == 5:
    check('explicit sequence 0', solve([['set', 'a', [0]], ['bind', 'a'], ['draw'], ['set', 'a', [1]], ['draw']], 8), [[0], [1]])
    check('explicit sequence 1', solve([['set', 'a', [0]], ['set', 'b', [2]], ['bind', 'b'], ['draw']], 8), [[2]])
    check('explicit sequence 2', solve([['set', 'a', [0]], ['bind', 'a'], ['draw'], ['drop', 'a'], ['draw']], 8), [[0], []])
    check('explicit sequence 3', solve([['set', 'a', [0]], ['bind', 'a'], ['draw'], ['clear'], ['draw']], 8), [[0], []])
    check('explicit sequence 4', solve([['set', 'a', [0]], ['bind', 'a'], ['draw'], ['disable'], ['draw'], ['enable'], ['draw']], 8), [[0], [0, 1, 2, 3, 4, 5, 6, 7], [0]])
    check('explicit sequence 5', solve([['bind', 'missing'], ['draw']], 8), [[]])
    check('explicit sequence 6', solve([['set', 'a', [0, 99]], ['bind', 'a'], ['draw'], ['invalidate', 'a'], ['draw']], 8), [[0], [0]])
    check('explicit sequence 7', solve([['set', 'a', []], ['bind', 'a'], ['draw']], 8), [[]])
    check('explicit sequence 8', solve([['set', 'a', [0]], ['set', 'b', [1]], ['bind', 'a'], ['draw'], ['drop', 'a'], ['draw']], 8), [[0], []])
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
explicit sequence 0[[0], [0]][[0], [1]]Failed
explicit sequence 1[[2]][[2]]Passed
explicit sequence 2[[0], []][[0], []]Passed
explicit sequence 3[[0], []][[0], []]Passed
explicit sequence 4[[0], [0, 1, 2, 3], [0]][[0], [0, 1, 2, 3], [0]]Passed
explicit sequence 5[[]][[]]Passed
explicit sequence 6[[0], [0]][[0], [0]]Passed
explicit sequence 7[[]][[]]Passed
explicit sequence 8[[0], []][[0], []]Passed

SHA-256 / d406fdd185be2fa21f60b26aca4e1de6f311bb89f0d9e4efe11ab9ee94e2c8ac

2 / The unsuccessful fix

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

N = 1
observations = []
def solve(commands, size):
    full=set(range(size))
    defs={}
    revs={}
    cache={}
    active=None
    enabled=True
    out=[]
    for cmd in commands:
        op=cmd[0]
        if op=='set':
            defs[cmd[1]]=set(cmd[2]) & full
            revs[cmd[1]]=revs.get(cmd[1],0)+1
        elif op=='bind': active=cmd[1]
        elif op=='drop':
            defs.pop(cmd[1],None)
            cache.pop(cmd[1],None)
        elif op=='invalidate': cache.pop(cmd[1],None)
        elif op=='clear': defs.clear(); cache.clear()
        elif op=='disable': enabled=False
        elif op=='enable': enabled=True
        elif op=='draw':
            revision=revs.get(active,0)
            if active not in cache or cache[active][0]+1<revision:
                cache[active]=(revision,set(defs.get(active,set())))
            out.append(sorted(cache[active][1] if enabled else full))
    return out
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
if N == 1:
    check('explicit sequence 0', solve([['set', 'a', [0]], ['bind', 'a'], ['draw'], ['set', 'a', [1]], ['draw']], 4), [[0], [1]])
    check('explicit sequence 1', solve([['set', 'a', [0]], ['set', 'b', [2]], ['bind', 'b'], ['draw']], 4), [[2]])
    check('explicit sequence 2', solve([['set', 'a', [0]], ['bind', 'a'], ['draw'], ['drop', 'a'], ['draw']], 4), [[0], []])
    check('explicit sequence 3', solve([['set', 'a', [0]], ['bind', 'a'], ['draw'], ['clear'], ['draw']], 4), [[0], []])
    check('explicit sequence 4', solve([['set', 'a', [0]], ['bind', 'a'], ['draw'], ['disable'], ['draw'], ['enable'], ['draw']], 4), [[0], [0, 1, 2, 3], [0]])
    check('explicit sequence 5', solve([['bind', 'missing'], ['draw']], 4), [[]])
    check('explicit sequence 6', solve([['set', 'a', [0, 99]], ['bind', 'a'], ['draw'], ['invalidate', 'a'], ['draw']], 4), [[0], [0]])
    check('explicit sequence 7', solve([['set', 'a', []], ['bind', 'a'], ['draw']], 4), [[]])
    check('explicit sequence 8', solve([['set', 'a', [0]], ['set', 'b', [1]], ['bind', 'a'], ['draw'], ['drop', 'a'], ['draw']], 4), [[0], []])
if N == 2:
    check('explicit sequence 0', solve([['set', 'a', [0]], ['bind', 'a'], ['draw'], ['set', 'a', [1]], ['draw']], 5), [[0], [1]])
    check('explicit sequence 1', solve([['set', 'a', [0]], ['set', 'b', [2]], ['bind', 'b'], ['draw']], 5), [[2]])
    check('explicit sequence 2', solve([['set', 'a', [0]], ['bind', 'a'], ['draw'], ['drop', 'a'], ['draw']], 5), [[0], []])
    check('explicit sequence 3', solve([['set', 'a', [0]], ['bind', 'a'], ['draw'], ['clear'], ['draw']], 5), [[0], []])
    check('explicit sequence 4', solve([['set', 'a', [0]], ['bind', 'a'], ['draw'], ['disable'], ['draw'], ['enable'], ['draw']], 5), [[0], [0, 1, 2, 3, 4], [0]])
    check('explicit sequence 5', solve([['bind', 'missing'], ['draw']], 5), [[]])
    check('explicit sequence 6', solve([['set', 'a', [0, 99]], ['bind', 'a'], ['draw'], ['invalidate', 'a'], ['draw']], 5), [[0], [0]])
    check('explicit sequence 7', solve([['set', 'a', []], ['bind', 'a'], ['draw']], 5), [[]])
    check('explicit sequence 8', solve([['set', 'a', [0]], ['set', 'b', [1]], ['bind', 'a'], ['draw'], ['drop', 'a'], ['draw']], 5), [[0], []])
if N == 3:
    check('explicit sequence 0', solve([['set', 'a', [0]], ['bind', 'a'], ['draw'], ['set', 'a', [1]], ['draw']], 6), [[0], [1]])
    check('explicit sequence 1', solve([['set', 'a', [0]], ['set', 'b', [2]], ['bind', 'b'], ['draw']], 6), [[2]])
    check('explicit sequence 2', solve([['set', 'a', [0]], ['bind', 'a'], ['draw'], ['drop', 'a'], ['draw']], 6), [[0], []])
    check('explicit sequence 3', solve([['set', 'a', [0]], ['bind', 'a'], ['draw'], ['clear'], ['draw']], 6), [[0], []])
    check('explicit sequence 4', solve([['set', 'a', [0]], ['bind', 'a'], ['draw'], ['disable'], ['draw'], ['enable'], ['draw']], 6), [[0], [0, 1, 2, 3, 4, 5], [0]])
    check('explicit sequence 5', solve([['bind', 'missing'], ['draw']], 6), [[]])
    check('explicit sequence 6', solve([['set', 'a', [0, 99]], ['bind', 'a'], ['draw'], ['invalidate', 'a'], ['draw']], 6), [[0], [0]])
    check('explicit sequence 7', solve([['set', 'a', []], ['bind', 'a'], ['draw']], 6), [[]])
    check('explicit sequence 8', solve([['set', 'a', [0]], ['set', 'b', [1]], ['bind', 'a'], ['draw'], ['drop', 'a'], ['draw']], 6), [[0], []])
if N == 4:
    check('explicit sequence 0', solve([['set', 'a', [0]], ['bind', 'a'], ['draw'], ['set', 'a', [1]], ['draw']], 7), [[0], [1]])
    check('explicit sequence 1', solve([['set', 'a', [0]], ['set', 'b', [2]], ['bind', 'b'], ['draw']], 7), [[2]])
    check('explicit sequence 2', solve([['set', 'a', [0]], ['bind', 'a'], ['draw'], ['drop', 'a'], ['draw']], 7), [[0], []])
    check('explicit sequence 3', solve([['set', 'a', [0]], ['bind', 'a'], ['draw'], ['clear'], ['draw']], 7), [[0], []])
    check('explicit sequence 4', solve([['set', 'a', [0]], ['bind', 'a'], ['draw'], ['disable'], ['draw'], ['enable'], ['draw']], 7), [[0], [0, 1, 2, 3, 4, 5, 6], [0]])
    check('explicit sequence 5', solve([['bind', 'missing'], ['draw']], 7), [[]])
    check('explicit sequence 6', solve([['set', 'a', [0, 99]], ['bind', 'a'], ['draw'], ['invalidate', 'a'], ['draw']], 7), [[0], [0]])
    check('explicit sequence 7', solve([['set', 'a', []], ['bind', 'a'], ['draw']], 7), [[]])
    check('explicit sequence 8', solve([['set', 'a', [0]], ['set', 'b', [1]], ['bind', 'a'], ['draw'], ['drop', 'a'], ['draw']], 7), [[0], []])
if N == 5:
    check('explicit sequence 0', solve([['set', 'a', [0]], ['bind', 'a'], ['draw'], ['set', 'a', [1]], ['draw']], 8), [[0], [1]])
    check('explicit sequence 1', solve([['set', 'a', [0]], ['set', 'b', [2]], ['bind', 'b'], ['draw']], 8), [[2]])
    check('explicit sequence 2', solve([['set', 'a', [0]], ['bind', 'a'], ['draw'], ['drop', 'a'], ['draw']], 8), [[0], []])
    check('explicit sequence 3', solve([['set', 'a', [0]], ['bind', 'a'], ['draw'], ['clear'], ['draw']], 8), [[0], []])
    check('explicit sequence 4', solve([['set', 'a', [0]], ['bind', 'a'], ['draw'], ['disable'], ['draw'], ['enable'], ['draw']], 8), [[0], [0, 1, 2, 3, 4, 5, 6, 7], [0]])
    check('explicit sequence 5', solve([['bind', 'missing'], ['draw']], 8), [[]])
    check('explicit sequence 6', solve([['set', 'a', [0, 99]], ['bind', 'a'], ['draw'], ['invalidate', 'a'], ['draw']], 8), [[0], [0]])
    check('explicit sequence 7', solve([['set', 'a', []], ['bind', 'a'], ['draw']], 8), [[]])
    check('explicit sequence 8', solve([['set', 'a', [0]], ['set', 'b', [1]], ['bind', 'a'], ['draw'], ['drop', 'a'], ['draw']], 8), [[0], []])
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
explicit sequence 0[[0], [0]][[0], [1]]Failed
explicit sequence 1[[2]][[2]]Passed
explicit sequence 2[[0], []][[0], []]Passed
explicit sequence 3[[0], []][[0], []]Passed
explicit sequence 4[[0], [0, 1, 2, 3], [0]][[0], [0, 1, 2, 3], [0]]Passed
explicit sequence 5[[]][[]]Passed
explicit sequence 6[[0], [0]][[0], [0]]Passed
explicit sequence 7[[]][[]]Passed
explicit sequence 8[[0], []][[0], []]Passed

SHA-256 / 6c2ee546697ddc98aefad184fad68e19d59fb704e690c1b81ba2373ad9d236d9

3 / The verified repair

Exit 0
"""Failure Map reference implementation. Python standard library only."""
import json

N = 1
observations = []
def solve(commands, size):
    full=set(range(size))
    defs={}
    revs={}
    cache={}
    active=None
    enabled=True
    out=[]
    for cmd in commands:
        op=cmd[0]
        if op=='set':
            defs[cmd[1]]=set(cmd[2]) & full
            revs[cmd[1]]=revs.get(cmd[1],0)+1
        elif op=='bind': active=cmd[1]
        elif op=='drop':
            defs.pop(cmd[1],None)
            cache.pop(cmd[1],None)
        elif op=='invalidate': cache.pop(cmd[1],None)
        elif op=='clear': defs.clear(); cache.clear()
        elif op=='disable': enabled=False
        elif op=='enable': enabled=True
        elif op=='draw':
            revision=revs.get(active,0)
            if active not in cache or cache[active][0]!=revision:
                cache[active]=(revision,set(defs.get(active,set())))
            out.append(sorted(cache[active][1] if enabled else full))
    return out
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
if N == 1:
    check('explicit sequence 0', solve([['set', 'a', [0]], ['bind', 'a'], ['draw'], ['set', 'a', [1]], ['draw']], 4), [[0], [1]])
    check('explicit sequence 1', solve([['set', 'a', [0]], ['set', 'b', [2]], ['bind', 'b'], ['draw']], 4), [[2]])
    check('explicit sequence 2', solve([['set', 'a', [0]], ['bind', 'a'], ['draw'], ['drop', 'a'], ['draw']], 4), [[0], []])
    check('explicit sequence 3', solve([['set', 'a', [0]], ['bind', 'a'], ['draw'], ['clear'], ['draw']], 4), [[0], []])
    check('explicit sequence 4', solve([['set', 'a', [0]], ['bind', 'a'], ['draw'], ['disable'], ['draw'], ['enable'], ['draw']], 4), [[0], [0, 1, 2, 3], [0]])
    check('explicit sequence 5', solve([['bind', 'missing'], ['draw']], 4), [[]])
    check('explicit sequence 6', solve([['set', 'a', [0, 99]], ['bind', 'a'], ['draw'], ['invalidate', 'a'], ['draw']], 4), [[0], [0]])
    check('explicit sequence 7', solve([['set', 'a', []], ['bind', 'a'], ['draw']], 4), [[]])
    check('explicit sequence 8', solve([['set', 'a', [0]], ['set', 'b', [1]], ['bind', 'a'], ['draw'], ['drop', 'a'], ['draw']], 4), [[0], []])
if N == 2:
    check('explicit sequence 0', solve([['set', 'a', [0]], ['bind', 'a'], ['draw'], ['set', 'a', [1]], ['draw']], 5), [[0], [1]])
    check('explicit sequence 1', solve([['set', 'a', [0]], ['set', 'b', [2]], ['bind', 'b'], ['draw']], 5), [[2]])
    check('explicit sequence 2', solve([['set', 'a', [0]], ['bind', 'a'], ['draw'], ['drop', 'a'], ['draw']], 5), [[0], []])
    check('explicit sequence 3', solve([['set', 'a', [0]], ['bind', 'a'], ['draw'], ['clear'], ['draw']], 5), [[0], []])
    check('explicit sequence 4', solve([['set', 'a', [0]], ['bind', 'a'], ['draw'], ['disable'], ['draw'], ['enable'], ['draw']], 5), [[0], [0, 1, 2, 3, 4], [0]])
    check('explicit sequence 5', solve([['bind', 'missing'], ['draw']], 5), [[]])
    check('explicit sequence 6', solve([['set', 'a', [0, 99]], ['bind', 'a'], ['draw'], ['invalidate', 'a'], ['draw']], 5), [[0], [0]])
    check('explicit sequence 7', solve([['set', 'a', []], ['bind', 'a'], ['draw']], 5), [[]])
    check('explicit sequence 8', solve([['set', 'a', [0]], ['set', 'b', [1]], ['bind', 'a'], ['draw'], ['drop', 'a'], ['draw']], 5), [[0], []])
if N == 3:
    check('explicit sequence 0', solve([['set', 'a', [0]], ['bind', 'a'], ['draw'], ['set', 'a', [1]], ['draw']], 6), [[0], [1]])
    check('explicit sequence 1', solve([['set', 'a', [0]], ['set', 'b', [2]], ['bind', 'b'], ['draw']], 6), [[2]])
    check('explicit sequence 2', solve([['set', 'a', [0]], ['bind', 'a'], ['draw'], ['drop', 'a'], ['draw']], 6), [[0], []])
    check('explicit sequence 3', solve([['set', 'a', [0]], ['bind', 'a'], ['draw'], ['clear'], ['draw']], 6), [[0], []])
    check('explicit sequence 4', solve([['set', 'a', [0]], ['bind', 'a'], ['draw'], ['disable'], ['draw'], ['enable'], ['draw']], 6), [[0], [0, 1, 2, 3, 4, 5], [0]])
    check('explicit sequence 5', solve([['bind', 'missing'], ['draw']], 6), [[]])
    check('explicit sequence 6', solve([['set', 'a', [0, 99]], ['bind', 'a'], ['draw'], ['invalidate', 'a'], ['draw']], 6), [[0], [0]])
    check('explicit sequence 7', solve([['set', 'a', []], ['bind', 'a'], ['draw']], 6), [[]])
    check('explicit sequence 8', solve([['set', 'a', [0]], ['set', 'b', [1]], ['bind', 'a'], ['draw'], ['drop', 'a'], ['draw']], 6), [[0], []])
if N == 4:
    check('explicit sequence 0', solve([['set', 'a', [0]], ['bind', 'a'], ['draw'], ['set', 'a', [1]], ['draw']], 7), [[0], [1]])
    check('explicit sequence 1', solve([['set', 'a', [0]], ['set', 'b', [2]], ['bind', 'b'], ['draw']], 7), [[2]])
    check('explicit sequence 2', solve([['set', 'a', [0]], ['bind', 'a'], ['draw'], ['drop', 'a'], ['draw']], 7), [[0], []])
    check('explicit sequence 3', solve([['set', 'a', [0]], ['bind', 'a'], ['draw'], ['clear'], ['draw']], 7), [[0], []])
    check('explicit sequence 4', solve([['set', 'a', [0]], ['bind', 'a'], ['draw'], ['disable'], ['draw'], ['enable'], ['draw']], 7), [[0], [0, 1, 2, 3, 4, 5, 6], [0]])
    check('explicit sequence 5', solve([['bind', 'missing'], ['draw']], 7), [[]])
    check('explicit sequence 6', solve([['set', 'a', [0, 99]], ['bind', 'a'], ['draw'], ['invalidate', 'a'], ['draw']], 7), [[0], [0]])
    check('explicit sequence 7', solve([['set', 'a', []], ['bind', 'a'], ['draw']], 7), [[]])
    check('explicit sequence 8', solve([['set', 'a', [0]], ['set', 'b', [1]], ['bind', 'a'], ['draw'], ['drop', 'a'], ['draw']], 7), [[0], []])
if N == 5:
    check('explicit sequence 0', solve([['set', 'a', [0]], ['bind', 'a'], ['draw'], ['set', 'a', [1]], ['draw']], 8), [[0], [1]])
    check('explicit sequence 1', solve([['set', 'a', [0]], ['set', 'b', [2]], ['bind', 'b'], ['draw']], 8), [[2]])
    check('explicit sequence 2', solve([['set', 'a', [0]], ['bind', 'a'], ['draw'], ['drop', 'a'], ['draw']], 8), [[0], []])
    check('explicit sequence 3', solve([['set', 'a', [0]], ['bind', 'a'], ['draw'], ['clear'], ['draw']], 8), [[0], []])
    check('explicit sequence 4', solve([['set', 'a', [0]], ['bind', 'a'], ['draw'], ['disable'], ['draw'], ['enable'], ['draw']], 8), [[0], [0, 1, 2, 3, 4, 5, 6, 7], [0]])
    check('explicit sequence 5', solve([['bind', 'missing'], ['draw']], 8), [[]])
    check('explicit sequence 6', solve([['set', 'a', [0, 99]], ['bind', 'a'], ['draw'], ['invalidate', 'a'], ['draw']], 8), [[0], [0]])
    check('explicit sequence 7', solve([['set', 'a', []], ['bind', 'a'], ['draw']], 8), [[]])
    check('explicit sequence 8', solve([['set', 'a', [0]], ['set', 'b', [1]], ['bind', 'a'], ['draw'], ['drop', 'a'], ['draw']], 8), [[0], []])
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
explicit sequence 0[[0], [1]][[0], [1]]Passed
explicit sequence 1[[2]][[2]]Passed
explicit sequence 2[[0], []][[0], []]Passed
explicit sequence 3[[0], []][[0], []]Passed
explicit sequence 4[[0], [0, 1, 2, 3], [0]][[0], [0, 1, 2, 3], [0]]Passed
explicit sequence 5[[]][[]]Passed
explicit sequence 6[[0], [0]][[0], [0]]Passed
explicit sequence 7[[]][[]]Passed
explicit sequence 8[[0], []][[0], []]Passed

SHA-256 / 140084f6d79f7cb8de96d085e39d8a092ecddaf5076bbaf2f5831b57e0f030ba

Verification & scope

Finite one-dimensional integer sample sets model coverage state only; no geometric intersection, memory layout, GPU or graphics-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 2026-09-29T14:45:09.927501+00:00.

Case digest / 14799783f451050b00c99cc5c2a9a69e4af1ba7ffb67f4066f929fe892697e6a