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FA-51121 / Raster clipping / Open access

Clip occlusion query: conditional missing · case 01

A missing conditional query defaults to visible and executes the draw.

Verified by executionVariant 1 · 12 checks per implementationDownload source bundle ↓JSON ↗

ROOT CAUSE

A missing conditional query defaults to visible and executes the draw.

THE FAILURE

A missing conditional query defaults to visible and executes the draw.

Unsuccessful approach: Using target size as the missing result still executes unproven conditional coverage.

Case contract

Queries count distinct covered sample IDs per draw after path clipping and sample enable masking. Multiple draws accumulate independently, while duplicate sample IDs within one draw count once. Begin resets a named result and activates it; end makes it readable. Result reads while active return null. Conditional draws consult only completed query counts. Disabling queries pauses accumulation without disabling clipping.

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))
    clip=set(full)
    lanes=set(full)
    results={}
    active=None
    query_enabled=True
    out=[]
    for cmd in commands:
        op=cmd[0]
        if op=='clip': clip=set(cmd[1])&full
        elif op=='lanes': lanes=set(cmd[1])&full
        elif op=='begin': active=cmd[1]; results[active]=0
        elif op=='end': active=None
        elif op=='enable-query': query_enabled=cmd[1]
        elif op in ('draw','conditional'):
            samples=cmd[1]
            if op=='conditional' and (cmd[2]==active or results.get(cmd[2],1)==0): continue
            visible=set(samples)&clip&lanes
            if active is not None and query_enabled: results[active]+=len(visible)
        elif op=='read': out.append(None if cmd[1]==active else results.get(cmd[1],0))
    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([['clip', [0]], ['begin', 'q'], ['draw', [0, 1]], ['end'], ['read', 'q']], 4), [1])
    check('explicit sequence 1', solve([['lanes', [0]], ['begin', 'q'], ['draw', [0, 1]], ['end'], ['read', 'q']], 4), [1])
    check('explicit sequence 2', solve([['begin', 'q'], ['draw', [0, 0, 1]], ['end'], ['read', 'q']], 4), [2])
    check('explicit sequence 3', solve([['begin', 'q'], ['draw', [0]], ['draw', [1]], ['end'], ['read', 'q']], 4), [2])
    check('explicit sequence 4', solve([['begin', 'q'], ['draw', [0]], ['end'], ['begin', 'q'], ['end'], ['read', 'q']], 4), [0])
    check('explicit sequence 5', solve([['begin', 'q'], ['draw', [0]], ['end'], ['draw', [1]], ['read', 'q']], 4), [1])
    check('explicit sequence 6', solve([['begin', 'q'], ['enable-query', False], ['draw', [0]], ['enable-query', True], ['end'], ['read', 'q']], 4), [0])
    check('explicit sequence 7', solve([['begin', 'q'], ['draw', [0]], ['read', 'q'], ['conditional', [1], 'q'], ['end'], ['read', 'q']], 4), [None, 1])
    check('explicit sequence 8', solve([['begin', 'q'], ['conditional', [0], 'missing'], ['end'], ['read', 'q']], 4), [0])
    check('explicit sequence 9', solve([['begin', 'a'], ['draw', [0]], ['end'], ['begin', 'b'], ['end'], ['read', 'b']], 4), [0])
    check('explicit sequence 10', solve([['clip', []], ['begin', 'q'], ['draw', [0]], ['end'], ['read', 'q']], 4), [0])
    check('explicit sequence 11', solve([['begin', 'q'], ['draw', [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]], ['end'], ['read', 'q']], 4), [4])
if N == 2:
    check('explicit sequence 0', solve([['clip', [0]], ['begin', 'q'], ['draw', [0, 1]], ['end'], ['read', 'q']], 5), [1])
    check('explicit sequence 1', solve([['lanes', [0]], ['begin', 'q'], ['draw', [0, 1]], ['end'], ['read', 'q']], 5), [1])
    check('explicit sequence 2', solve([['begin', 'q'], ['draw', [0, 0, 1]], ['end'], ['read', 'q']], 5), [2])
    check('explicit sequence 3', solve([['begin', 'q'], ['draw', [0]], ['draw', [1]], ['end'], ['read', 'q']], 5), [2])
    check('explicit sequence 4', solve([['begin', 'q'], ['draw', [0]], ['end'], ['begin', 'q'], ['end'], ['read', 'q']], 5), [0])
    check('explicit sequence 5', solve([['begin', 'q'], ['draw', [0]], ['end'], ['draw', [1]], ['read', 'q']], 5), [1])
    check('explicit sequence 6', solve([['begin', 'q'], ['enable-query', False], ['draw', [0]], ['enable-query', True], ['end'], ['read', 'q']], 5), [0])
    check('explicit sequence 7', solve([['begin', 'q'], ['draw', [0]], ['read', 'q'], ['conditional', [1], 'q'], ['end'], ['read', 'q']], 5), [None, 1])
    check('explicit sequence 8', solve([['begin', 'q'], ['conditional', [0], 'missing'], ['end'], ['read', 'q']], 5), [0])
    check('explicit sequence 9', solve([['begin', 'a'], ['draw', [0]], ['end'], ['begin', 'b'], ['end'], ['read', 'b']], 5), [0])
    check('explicit sequence 10', solve([['clip', []], ['begin', 'q'], ['draw', [0]], ['end'], ['read', 'q']], 5), [0])
    check('explicit sequence 11', solve([['begin', 'q'], ['draw', [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]], ['end'], ['read', 'q']], 5), [5])
if N == 3:
    check('explicit sequence 0', solve([['clip', [0]], ['begin', 'q'], ['draw', [0, 1]], ['end'], ['read', 'q']], 6), [1])
    check('explicit sequence 1', solve([['lanes', [0]], ['begin', 'q'], ['draw', [0, 1]], ['end'], ['read', 'q']], 6), [1])
    check('explicit sequence 2', solve([['begin', 'q'], ['draw', [0, 0, 1]], ['end'], ['read', 'q']], 6), [2])
    check('explicit sequence 3', solve([['begin', 'q'], ['draw', [0]], ['draw', [1]], ['end'], ['read', 'q']], 6), [2])
    check('explicit sequence 4', solve([['begin', 'q'], ['draw', [0]], ['end'], ['begin', 'q'], ['end'], ['read', 'q']], 6), [0])
    check('explicit sequence 5', solve([['begin', 'q'], ['draw', [0]], ['end'], ['draw', [1]], ['read', 'q']], 6), [1])
    check('explicit sequence 6', solve([['begin', 'q'], ['enable-query', False], ['draw', [0]], ['enable-query', True], ['end'], ['read', 'q']], 6), [0])
    check('explicit sequence 7', solve([['begin', 'q'], ['draw', [0]], ['read', 'q'], ['conditional', [1], 'q'], ['end'], ['read', 'q']], 6), [None, 1])
    check('explicit sequence 8', solve([['begin', 'q'], ['conditional', [0], 'missing'], ['end'], ['read', 'q']], 6), [0])
    check('explicit sequence 9', solve([['begin', 'a'], ['draw', [0]], ['end'], ['begin', 'b'], ['end'], ['read', 'b']], 6), [0])
    check('explicit sequence 10', solve([['clip', []], ['begin', 'q'], ['draw', [0]], ['end'], ['read', 'q']], 6), [0])
    check('explicit sequence 11', solve([['begin', 'q'], ['draw', [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]], ['end'], ['read', 'q']], 6), [6])
if N == 4:
    check('explicit sequence 0', solve([['clip', [0]], ['begin', 'q'], ['draw', [0, 1]], ['end'], ['read', 'q']], 7), [1])
    check('explicit sequence 1', solve([['lanes', [0]], ['begin', 'q'], ['draw', [0, 1]], ['end'], ['read', 'q']], 7), [1])
    check('explicit sequence 2', solve([['begin', 'q'], ['draw', [0, 0, 1]], ['end'], ['read', 'q']], 7), [2])
    check('explicit sequence 3', solve([['begin', 'q'], ['draw', [0]], ['draw', [1]], ['end'], ['read', 'q']], 7), [2])
    check('explicit sequence 4', solve([['begin', 'q'], ['draw', [0]], ['end'], ['begin', 'q'], ['end'], ['read', 'q']], 7), [0])
    check('explicit sequence 5', solve([['begin', 'q'], ['draw', [0]], ['end'], ['draw', [1]], ['read', 'q']], 7), [1])
    check('explicit sequence 6', solve([['begin', 'q'], ['enable-query', False], ['draw', [0]], ['enable-query', True], ['end'], ['read', 'q']], 7), [0])
    check('explicit sequence 7', solve([['begin', 'q'], ['draw', [0]], ['read', 'q'], ['conditional', [1], 'q'], ['end'], ['read', 'q']], 7), [None, 1])
    check('explicit sequence 8', solve([['begin', 'q'], ['conditional', [0], 'missing'], ['end'], ['read', 'q']], 7), [0])
    check('explicit sequence 9', solve([['begin', 'a'], ['draw', [0]], ['end'], ['begin', 'b'], ['end'], ['read', 'b']], 7), [0])
    check('explicit sequence 10', solve([['clip', []], ['begin', 'q'], ['draw', [0]], ['end'], ['read', 'q']], 7), [0])
    check('explicit sequence 11', solve([['begin', 'q'], ['draw', [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]], ['end'], ['read', 'q']], 7), [7])
if N == 5:
    check('explicit sequence 0', solve([['clip', [0]], ['begin', 'q'], ['draw', [0, 1]], ['end'], ['read', 'q']], 8), [1])
    check('explicit sequence 1', solve([['lanes', [0]], ['begin', 'q'], ['draw', [0, 1]], ['end'], ['read', 'q']], 8), [1])
    check('explicit sequence 2', solve([['begin', 'q'], ['draw', [0, 0, 1]], ['end'], ['read', 'q']], 8), [2])
    check('explicit sequence 3', solve([['begin', 'q'], ['draw', [0]], ['draw', [1]], ['end'], ['read', 'q']], 8), [2])
    check('explicit sequence 4', solve([['begin', 'q'], ['draw', [0]], ['end'], ['begin', 'q'], ['end'], ['read', 'q']], 8), [0])
    check('explicit sequence 5', solve([['begin', 'q'], ['draw', [0]], ['end'], ['draw', [1]], ['read', 'q']], 8), [1])
    check('explicit sequence 6', solve([['begin', 'q'], ['enable-query', False], ['draw', [0]], ['enable-query', True], ['end'], ['read', 'q']], 8), [0])
    check('explicit sequence 7', solve([['begin', 'q'], ['draw', [0]], ['read', 'q'], ['conditional', [1], 'q'], ['end'], ['read', 'q']], 8), [None, 1])
    check('explicit sequence 8', solve([['begin', 'q'], ['conditional', [0], 'missing'], ['end'], ['read', 'q']], 8), [0])
    check('explicit sequence 9', solve([['begin', 'a'], ['draw', [0]], ['end'], ['begin', 'b'], ['end'], ['read', 'b']], 8), [0])
    check('explicit sequence 10', solve([['clip', []], ['begin', 'q'], ['draw', [0]], ['end'], ['read', 'q']], 8), [0])
    check('explicit sequence 11', solve([['begin', 'q'], ['draw', [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]], ['end'], ['read', 'q']], 8), [8])
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[1][1]Passed
explicit sequence 1[1][1]Passed
explicit sequence 2[2][2]Passed
explicit sequence 3[2][2]Passed
explicit sequence 4[0][0]Passed
explicit sequence 5[1][1]Passed
explicit sequence 6[0][0]Passed
explicit sequence 7[None, 1][None, 1]Passed
explicit sequence 8[1][0]Failed
explicit sequence 9[0][0]Passed
explicit sequence 10[0][0]Passed
explicit sequence 11[4][4]Passed

SHA-256 / 263c28a4d0fc175892b12a0fac301a41cd66081a846a326c11929ab083b1fa1a

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))
    clip=set(full)
    lanes=set(full)
    results={}
    active=None
    query_enabled=True
    out=[]
    for cmd in commands:
        op=cmd[0]
        if op=='clip': clip=set(cmd[1])&full
        elif op=='lanes': lanes=set(cmd[1])&full
        elif op=='begin': active=cmd[1]; results[active]=0
        elif op=='end': active=None
        elif op=='enable-query': query_enabled=cmd[1]
        elif op in ('draw','conditional'):
            samples=cmd[1]
            if op=='conditional' and (cmd[2]==active or results.get(cmd[2],len(full))==0): continue
            visible=set(samples)&clip&lanes
            if active is not None and query_enabled: results[active]+=len(visible)
        elif op=='read': out.append(None if cmd[1]==active else results.get(cmd[1],0))
    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([['clip', [0]], ['begin', 'q'], ['draw', [0, 1]], ['end'], ['read', 'q']], 4), [1])
    check('explicit sequence 1', solve([['lanes', [0]], ['begin', 'q'], ['draw', [0, 1]], ['end'], ['read', 'q']], 4), [1])
    check('explicit sequence 2', solve([['begin', 'q'], ['draw', [0, 0, 1]], ['end'], ['read', 'q']], 4), [2])
    check('explicit sequence 3', solve([['begin', 'q'], ['draw', [0]], ['draw', [1]], ['end'], ['read', 'q']], 4), [2])
    check('explicit sequence 4', solve([['begin', 'q'], ['draw', [0]], ['end'], ['begin', 'q'], ['end'], ['read', 'q']], 4), [0])
    check('explicit sequence 5', solve([['begin', 'q'], ['draw', [0]], ['end'], ['draw', [1]], ['read', 'q']], 4), [1])
    check('explicit sequence 6', solve([['begin', 'q'], ['enable-query', False], ['draw', [0]], ['enable-query', True], ['end'], ['read', 'q']], 4), [0])
    check('explicit sequence 7', solve([['begin', 'q'], ['draw', [0]], ['read', 'q'], ['conditional', [1], 'q'], ['end'], ['read', 'q']], 4), [None, 1])
    check('explicit sequence 8', solve([['begin', 'q'], ['conditional', [0], 'missing'], ['end'], ['read', 'q']], 4), [0])
    check('explicit sequence 9', solve([['begin', 'a'], ['draw', [0]], ['end'], ['begin', 'b'], ['end'], ['read', 'b']], 4), [0])
    check('explicit sequence 10', solve([['clip', []], ['begin', 'q'], ['draw', [0]], ['end'], ['read', 'q']], 4), [0])
    check('explicit sequence 11', solve([['begin', 'q'], ['draw', [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]], ['end'], ['read', 'q']], 4), [4])
if N == 2:
    check('explicit sequence 0', solve([['clip', [0]], ['begin', 'q'], ['draw', [0, 1]], ['end'], ['read', 'q']], 5), [1])
    check('explicit sequence 1', solve([['lanes', [0]], ['begin', 'q'], ['draw', [0, 1]], ['end'], ['read', 'q']], 5), [1])
    check('explicit sequence 2', solve([['begin', 'q'], ['draw', [0, 0, 1]], ['end'], ['read', 'q']], 5), [2])
    check('explicit sequence 3', solve([['begin', 'q'], ['draw', [0]], ['draw', [1]], ['end'], ['read', 'q']], 5), [2])
    check('explicit sequence 4', solve([['begin', 'q'], ['draw', [0]], ['end'], ['begin', 'q'], ['end'], ['read', 'q']], 5), [0])
    check('explicit sequence 5', solve([['begin', 'q'], ['draw', [0]], ['end'], ['draw', [1]], ['read', 'q']], 5), [1])
    check('explicit sequence 6', solve([['begin', 'q'], ['enable-query', False], ['draw', [0]], ['enable-query', True], ['end'], ['read', 'q']], 5), [0])
    check('explicit sequence 7', solve([['begin', 'q'], ['draw', [0]], ['read', 'q'], ['conditional', [1], 'q'], ['end'], ['read', 'q']], 5), [None, 1])
    check('explicit sequence 8', solve([['begin', 'q'], ['conditional', [0], 'missing'], ['end'], ['read', 'q']], 5), [0])
    check('explicit sequence 9', solve([['begin', 'a'], ['draw', [0]], ['end'], ['begin', 'b'], ['end'], ['read', 'b']], 5), [0])
    check('explicit sequence 10', solve([['clip', []], ['begin', 'q'], ['draw', [0]], ['end'], ['read', 'q']], 5), [0])
    check('explicit sequence 11', solve([['begin', 'q'], ['draw', [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]], ['end'], ['read', 'q']], 5), [5])
if N == 3:
    check('explicit sequence 0', solve([['clip', [0]], ['begin', 'q'], ['draw', [0, 1]], ['end'], ['read', 'q']], 6), [1])
    check('explicit sequence 1', solve([['lanes', [0]], ['begin', 'q'], ['draw', [0, 1]], ['end'], ['read', 'q']], 6), [1])
    check('explicit sequence 2', solve([['begin', 'q'], ['draw', [0, 0, 1]], ['end'], ['read', 'q']], 6), [2])
    check('explicit sequence 3', solve([['begin', 'q'], ['draw', [0]], ['draw', [1]], ['end'], ['read', 'q']], 6), [2])
    check('explicit sequence 4', solve([['begin', 'q'], ['draw', [0]], ['end'], ['begin', 'q'], ['end'], ['read', 'q']], 6), [0])
    check('explicit sequence 5', solve([['begin', 'q'], ['draw', [0]], ['end'], ['draw', [1]], ['read', 'q']], 6), [1])
    check('explicit sequence 6', solve([['begin', 'q'], ['enable-query', False], ['draw', [0]], ['enable-query', True], ['end'], ['read', 'q']], 6), [0])
    check('explicit sequence 7', solve([['begin', 'q'], ['draw', [0]], ['read', 'q'], ['conditional', [1], 'q'], ['end'], ['read', 'q']], 6), [None, 1])
    check('explicit sequence 8', solve([['begin', 'q'], ['conditional', [0], 'missing'], ['end'], ['read', 'q']], 6), [0])
    check('explicit sequence 9', solve([['begin', 'a'], ['draw', [0]], ['end'], ['begin', 'b'], ['end'], ['read', 'b']], 6), [0])
    check('explicit sequence 10', solve([['clip', []], ['begin', 'q'], ['draw', [0]], ['end'], ['read', 'q']], 6), [0])
    check('explicit sequence 11', solve([['begin', 'q'], ['draw', [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]], ['end'], ['read', 'q']], 6), [6])
if N == 4:
    check('explicit sequence 0', solve([['clip', [0]], ['begin', 'q'], ['draw', [0, 1]], ['end'], ['read', 'q']], 7), [1])
    check('explicit sequence 1', solve([['lanes', [0]], ['begin', 'q'], ['draw', [0, 1]], ['end'], ['read', 'q']], 7), [1])
    check('explicit sequence 2', solve([['begin', 'q'], ['draw', [0, 0, 1]], ['end'], ['read', 'q']], 7), [2])
    check('explicit sequence 3', solve([['begin', 'q'], ['draw', [0]], ['draw', [1]], ['end'], ['read', 'q']], 7), [2])
    check('explicit sequence 4', solve([['begin', 'q'], ['draw', [0]], ['end'], ['begin', 'q'], ['end'], ['read', 'q']], 7), [0])
    check('explicit sequence 5', solve([['begin', 'q'], ['draw', [0]], ['end'], ['draw', [1]], ['read', 'q']], 7), [1])
    check('explicit sequence 6', solve([['begin', 'q'], ['enable-query', False], ['draw', [0]], ['enable-query', True], ['end'], ['read', 'q']], 7), [0])
    check('explicit sequence 7', solve([['begin', 'q'], ['draw', [0]], ['read', 'q'], ['conditional', [1], 'q'], ['end'], ['read', 'q']], 7), [None, 1])
    check('explicit sequence 8', solve([['begin', 'q'], ['conditional', [0], 'missing'], ['end'], ['read', 'q']], 7), [0])
    check('explicit sequence 9', solve([['begin', 'a'], ['draw', [0]], ['end'], ['begin', 'b'], ['end'], ['read', 'b']], 7), [0])
    check('explicit sequence 10', solve([['clip', []], ['begin', 'q'], ['draw', [0]], ['end'], ['read', 'q']], 7), [0])
    check('explicit sequence 11', solve([['begin', 'q'], ['draw', [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]], ['end'], ['read', 'q']], 7), [7])
if N == 5:
    check('explicit sequence 0', solve([['clip', [0]], ['begin', 'q'], ['draw', [0, 1]], ['end'], ['read', 'q']], 8), [1])
    check('explicit sequence 1', solve([['lanes', [0]], ['begin', 'q'], ['draw', [0, 1]], ['end'], ['read', 'q']], 8), [1])
    check('explicit sequence 2', solve([['begin', 'q'], ['draw', [0, 0, 1]], ['end'], ['read', 'q']], 8), [2])
    check('explicit sequence 3', solve([['begin', 'q'], ['draw', [0]], ['draw', [1]], ['end'], ['read', 'q']], 8), [2])
    check('explicit sequence 4', solve([['begin', 'q'], ['draw', [0]], ['end'], ['begin', 'q'], ['end'], ['read', 'q']], 8), [0])
    check('explicit sequence 5', solve([['begin', 'q'], ['draw', [0]], ['end'], ['draw', [1]], ['read', 'q']], 8), [1])
    check('explicit sequence 6', solve([['begin', 'q'], ['enable-query', False], ['draw', [0]], ['enable-query', True], ['end'], ['read', 'q']], 8), [0])
    check('explicit sequence 7', solve([['begin', 'q'], ['draw', [0]], ['read', 'q'], ['conditional', [1], 'q'], ['end'], ['read', 'q']], 8), [None, 1])
    check('explicit sequence 8', solve([['begin', 'q'], ['conditional', [0], 'missing'], ['end'], ['read', 'q']], 8), [0])
    check('explicit sequence 9', solve([['begin', 'a'], ['draw', [0]], ['end'], ['begin', 'b'], ['end'], ['read', 'b']], 8), [0])
    check('explicit sequence 10', solve([['clip', []], ['begin', 'q'], ['draw', [0]], ['end'], ['read', 'q']], 8), [0])
    check('explicit sequence 11', solve([['begin', 'q'], ['draw', [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]], ['end'], ['read', 'q']], 8), [8])
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[1][1]Passed
explicit sequence 1[1][1]Passed
explicit sequence 2[2][2]Passed
explicit sequence 3[2][2]Passed
explicit sequence 4[0][0]Passed
explicit sequence 5[1][1]Passed
explicit sequence 6[0][0]Passed
explicit sequence 7[None, 1][None, 1]Passed
explicit sequence 8[1][0]Failed
explicit sequence 9[0][0]Passed
explicit sequence 10[0][0]Passed
explicit sequence 11[4][4]Passed

SHA-256 / 0f2593f5a54d0d79de3f564913d7cde98ce99218c100bc7d0f4cc4e976d610ab

HELD IN THE MEMBER ARCHIVE

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

This mechanism has 12 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

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 2026-09-29T14:45:15.793657+00:00.

Case digest / 4b53ce60f5681d47a37a92bf902e8b2d0cf338d616ce32bc9804726b22388ae2