FA-9251 / Packaging / Open access

Artifact identity tuple: Unclassified artifacts collide with classified artifacts · case 01

Unclassified artifacts collide with classified artifacts.

Verified by executionVariant 1 · 5 checks per implementationDownload source bundle ↓JSON ↗

ROOT CAUSE

The implementation substitutes None) for classifier), so unclassified artifacts collide with classified artifacts.

THE FAILURE

The implementation substitutes None) for classifier), so unclassified artifacts collide with classified artifacts.

Unsuccessful approach: The attempted repair substitutes classifier or 'default'). Fixture 1 still yields ('my-pkg', (1, 2, 3), 'cp311', 'debug', 'default') instead of ('my-pkg', (1, 2, 3), 'cp311', 'debug', None).

Case contract

An artifact identity consists of project, version tuple, target ABI, build flavor, and optional classifier; preserve all fields including empty classifier.

Why this case matters

An offline model of artifact identity tuple, suitable for testing build and release tooling without external services.

1 / The failure

Exit 1

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

N = 1
observations = []
def solve(project, version, abi, flavor, classifier):
    return (project.casefold().replace('_', '-'), tuple(version), abi, flavor, None)
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
check('fixture 1', solve('My_Pkg', (1, 2, 3), 'cp311', 'debug', None), ('my-pkg', (1, 2, 3), 'cp311', 'debug', None))
check('fixture 2', solve('my-pkg', (1, 2, 3), 'cp312', 'release', 'tests'), ('my-pkg', (1, 2, 3), 'cp312', 'release', 'tests'))
check('fixture 3', solve('A_B', (2, 0, 1), 'abi3', 'release', ''), ('a-b', (2, 0, 1), 'abi3', 'release', ''))
check('fixture 4', solve('A_B', (2, 0, 2), 'abi3', 'debug', 'docs'), ('a-b', (2, 0, 2), 'abi3', 'debug', 'docs'))
check('fixture 5', solve('a_b', (2, 1, 0), 'none', 'release', None), ('a-b', (2, 1, 0), 'none', 'release', None))
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 fixture	Actual	Expected	Outcome
fixture 1	`['my-pkg', [1, 2, 3], 'cp311', 'debug', None]`	`['my-pkg', [1, 2, 3], 'cp311', 'debug', None]`	Passed
fixture 2	`['my-pkg', [1, 2, 3], 'cp312', 'release', None]`	`['my-pkg', [1, 2, 3], 'cp312', 'release', 'tests']`	Failed
fixture 3	`['a-b', [2, 0, 1], 'abi3', 'release', None]`	`['a-b', [2, 0, 1], 'abi3', 'release', '']`	Failed
fixture 4	`['a-b', [2, 0, 2], 'abi3', 'debug', None]`	`['a-b', [2, 0, 2], 'abi3', 'debug', 'docs']`	Failed
fixture 5	`['a-b', [2, 1, 0], 'none', 'release', None]`	`['a-b', [2, 1, 0], 'none', 'release', None]`	Passed

SHA-256 / 06f956c640a046888868021821bf7c1b02fac2f575a0d40f95da0767b3d9d036

2 / The unsuccessful fix

Exit 1

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

N = 1
observations = []
def solve(project, version, abi, flavor, classifier):
    return (project.casefold().replace('_', '-'), tuple(version), abi, flavor, classifier or 'default')
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
check('fixture 1', solve('My_Pkg', (1, 2, 3), 'cp311', 'debug', None), ('my-pkg', (1, 2, 3), 'cp311', 'debug', None))
check('fixture 2', solve('my-pkg', (1, 2, 3), 'cp312', 'release', 'tests'), ('my-pkg', (1, 2, 3), 'cp312', 'release', 'tests'))
check('fixture 3', solve('A_B', (2, 0, 1), 'abi3', 'release', ''), ('a-b', (2, 0, 1), 'abi3', 'release', ''))
check('fixture 4', solve('A_B', (2, 0, 2), 'abi3', 'debug', 'docs'), ('a-b', (2, 0, 2), 'abi3', 'debug', 'docs'))
check('fixture 5', solve('a_b', (2, 1, 0), 'none', 'release', None), ('a-b', (2, 1, 0), 'none', 'release', None))
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 fixture	Actual	Expected	Outcome
fixture 1	`['my-pkg', [1, 2, 3], 'cp311', 'debug', 'default']`	`['my-pkg', [1, 2, 3], 'cp311', 'debug', None]`	Failed
fixture 2	`['my-pkg', [1, 2, 3], 'cp312', 'release', 'tests']`	`['my-pkg', [1, 2, 3], 'cp312', 'release', 'tests']`	Passed
fixture 3	`['a-b', [2, 0, 1], 'abi3', 'release', 'default']`	`['a-b', [2, 0, 1], 'abi3', 'release', '']`	Failed
fixture 4	`['a-b', [2, 0, 2], 'abi3', 'debug', 'docs']`	`['a-b', [2, 0, 2], 'abi3', 'debug', 'docs']`	Passed
fixture 5	`['a-b', [2, 1, 0], 'none', 'release', 'default']`	`['a-b', [2, 1, 0], 'none', 'release', None]`	Failed

SHA-256 / 9186490f17c0018f2e5a659b8bc9e79c2391d265e1cdda2323e030ad0ed64ba2

HELD IN THE MEMBER ARCHIVE

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

This mechanism has 5 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.

Member access is invitation-based. Sign in with your invited account to inspect the repair.

Verification & scope

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 2026-09-29T14:38:28.406583+00:00.

Case digest / c4ec3cc79cbaf09ce9b19ae629fc712e46db52c6efe75681395b03e52ac6a9e7