FA-9761 / Configuration / Open access

Configuration provenance tracking: Deleted settings retain stale provenance · case 01

Deleted settings retain stale provenance.

Verified by executionVariant 1 · 6 checks per implementationDownload source bundle ↓JSON ↗

ROOT CAUSE

The implementation substitutes pass for sources.pop(key, None), so deleted settings retain stale provenance.

THE FAILURE

The implementation substitutes pass for sources.pop(key, None), so deleted settings retain stale provenance.

Unsuccessful approach: The attempted repair substitutes sources[key] = source. Fixture 3 still yields ({}, {'a': 'user'}) instead of ({}, {}).

Case contract

Return final values and source names. Each present setting replaces prior value and provenance, deletions remove both, and layers with no assignment preserve provenance.

Why this case matters

An offline model of configuration provenance tracking, 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(layers):
    values = {}
    sources = {}
    for source, settings in layers:
        for key, value in settings.items():
            if value is None:
                values.pop(key, None)
                pass
            else:
                values[key] = value
                sources[key] = source
    return (values, sources)
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
check('fixture 1', solve([]), ({}, {}))
check('fixture 2', solve([('default', {'a': 1}), ('user', {'a': 2})]), ({'a': 2}, {'a': 'user'}))
check('fixture 3', solve([('default', {'a': 1}), ('user', {'a': None})]), ({}, {}))
check('fixture 4', solve([('default', {'a': 1}), ('user', {})]), ({'a': 1}, {'a': 'default'}))
check('fixture 5', solve([('default', {'a': 1}), ('user', {'a': 1})]), ({'a': 1}, {'a': 'user'}))
check('fixture 6', solve([('default', {'a': 1}), ('user', {'a': False})]), ({'a': False}, {'a': 'user'}))
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	`[{}, {}]`	`[{}, {}]`	Passed
fixture 2	`[{'a': 2}, {'a': 'user'}]`	`[{'a': 2}, {'a': 'user'}]`	Passed
fixture 3	`[{}, {'a': 'default'}]`	`[{}, {}]`	Failed
fixture 4	`[{'a': 1}, {'a': 'default'}]`	`[{'a': 1}, {'a': 'default'}]`	Passed
fixture 5	`[{'a': 1}, {'a': 'user'}]`	`[{'a': 1}, {'a': 'user'}]`	Passed
fixture 6	`[{'a': False}, {'a': 'user'}]`	`[{'a': False}, {'a': 'user'}]`	Passed

SHA-256 / 2e5a9e484c91c4d22eef7bff360006d9d9ae188093e688459a37e6a50ea361ab

2 / The unsuccessful fix

Exit 1

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

N = 1
observations = []
def solve(layers):
    values = {}
    sources = {}
    for source, settings in layers:
        for key, value in settings.items():
            if value is None:
                values.pop(key, None)
                sources[key] = source
            else:
                values[key] = value
                sources[key] = source
    return (values, sources)
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
check('fixture 1', solve([]), ({}, {}))
check('fixture 2', solve([('default', {'a': 1}), ('user', {'a': 2})]), ({'a': 2}, {'a': 'user'}))
check('fixture 3', solve([('default', {'a': 1}), ('user', {'a': None})]), ({}, {}))
check('fixture 4', solve([('default', {'a': 1}), ('user', {})]), ({'a': 1}, {'a': 'default'}))
check('fixture 5', solve([('default', {'a': 1}), ('user', {'a': 1})]), ({'a': 1}, {'a': 'user'}))
check('fixture 6', solve([('default', {'a': 1}), ('user', {'a': False})]), ({'a': False}, {'a': 'user'}))
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	`[{}, {}]`	`[{}, {}]`	Passed
fixture 2	`[{'a': 2}, {'a': 'user'}]`	`[{'a': 2}, {'a': 'user'}]`	Passed
fixture 3	`[{}, {'a': 'user'}]`	`[{}, {}]`	Failed
fixture 4	`[{'a': 1}, {'a': 'default'}]`	`[{'a': 1}, {'a': 'default'}]`	Passed
fixture 5	`[{'a': 1}, {'a': 'user'}]`	`[{'a': 1}, {'a': 'user'}]`	Passed
fixture 6	`[{'a': False}, {'a': 'user'}]`	`[{'a': False}, {'a': 'user'}]`	Passed

SHA-256 / 1549773e1279cf824a328bfd0ea09ca3b679d513157175569adaf0dc41f81b96

HELD IN THE MEMBER ARCHIVE

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

This mechanism has 6 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 2026-09-29T14:38:32.939034+00:00.

Case digest / 67fbdace4d507ab583a0ae5a3cbaa081828ba186cf230002453315ba0f41e093