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FA-54921 / Astronomical coordinate conventions / Open access

Spectral axis reversal: Velocity-axis metadata follows the wavelength increment value · case 01

The adapter reports an incorrect velocity increment while other fields remain valid.

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

ROOT CAUSE

Velocity-axis metadata follows the wavelength increment value. Faulty expression: d['vel']

THE FAILURE

Velocity-axis metadata follows the wavelength increment value. Faulty expression: d['vel']

Unsuccessful approach: A partial convention repair still uses -d['step']

Case contract

Reverse a finite spectral pixel axis of length L using one-based pixel labels. Reference pixel, edge pixel coordinates, dispersion coefficients, and velocity-increment metadata must describe the same physical samples. Quadratic coefficient is unchanged under reversal about the reference. Output fields are defined by: reference = d['L']+1-d['r']; pixel = d['L']+1-d['p']; increment = -d['step']; quadratic = d['q']; velocity_increment = -d['vel']; interval = [d['L']+1-d['hi'],d['L']+1-d['lo']]

Why this case matters

Catalog, detector, sky-coordinate, and spectroscopy adapters must preserve the association between numeric coordinates and their declared reference conventions.

1 / The failure

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

N = 1
observations = []
def solve(d):
    return {'reference': d['L']+1-d['r'], 'pixel': d['L']+1-d['p'], 'increment': -d['step'], 'quadratic': d['q'], 'velocity_increment': d['vel'], 'interval': [d['L']+1-d['hi'],d['L']+1-d['lo']]}
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = {1: [({'L': 20, 'r': 6, 'p': 3, 'step': 2, 'q': 3, 'vel': 5, 'lo': 2, 'hi': 9}, {'reference': 15, 'pixel': 18, 'increment': -2, 'quadratic': 3, 'velocity_increment': -5, 'interval': [12, 19]}), ({'L': 1, 'r': 1, 'p': 1, 'step': 2, 'q': 3, 'vel': 5, 'lo': 1, 'hi': 1}, {'reference': 1, 'pixel': 1, 'increment': -2, 'quadratic': 3, 'velocity_increment': -5, 'interval': [1, 1]}), ({'L': 20, 'r': 6, 'p': 3, 'step': -3, 'q': 3, 'vel': -7, 'lo': 2, 'hi': 9}, {'reference': 15, 'pixel': 18, 'increment': 3, 'quadratic': 3, 'velocity_increment': 7, 'interval': [12, 19]}), ({'L': 20, 'r': 6, 'p': 3, 'step': 2, 'q': 0, 'vel': 5, 'lo': 2, 'hi': 9}, {'reference': 15, 'pixel': 18, 'increment': -2, 'quadratic': 0, 'velocity_increment': -5, 'interval': [12, 19]}), ({'L': 20, 'r': 20, 'p': 20, 'step': 2, 'q': 3, 'vel': 5, 'lo': 2, 'hi': 9}, {'reference': 1, 'pixel': 1, 'increment': -2, 'quadratic': 3, 'velocity_increment': -5, 'interval': [12, 19]}), ({'L': 12, 'r': 6, 'p': 3, 'step': 2, 'q': 3, 'vel': 5, 'lo': 3, 'hi': 4}, {'reference': 7, 'pixel': 10, 'increment': -2, 'quadratic': 3, 'velocity_increment': -5, 'interval': [9, 10]})], 2: [({'L': 20, 'r': 7, 'p': 3, 'step': 2, 'q': 3, 'vel': 5, 'lo': 2, 'hi': 9}, {'reference': 14, 'pixel': 18, 'increment': -2, 'quadratic': 3, 'velocity_increment': -5, 'interval': [12, 19]}), ({'L': 1, 'r': 2, 'p': 1, 'step': 2, 'q': 3, 'vel': 5, 'lo': 1, 'hi': 1}, {'reference': 0, 'pixel': 1, 'increment': -2, 'quadratic': 3, 'velocity_increment': -5, 'interval': [1, 1]}), ({'L': 20, 'r': 7, 'p': 3, 'step': -3, 'q': 3, 'vel': -7, 'lo': 2, 'hi': 9}, {'reference': 14, 'pixel': 18, 'increment': 3, 'quadratic': 3, 'velocity_increment': 7, 'interval': [12, 19]}), ({'L': 20, 'r': 7, 'p': 3, 'step': 2, 'q': 0, 'vel': 5, 'lo': 2, 'hi': 9}, {'reference': 14, 'pixel': 18, 'increment': -2, 'quadratic': 0, 'velocity_increment': -5, 'interval': [12, 19]}), ({'L': 20, 'r': 21, 'p': 20, 'step': 2, 'q': 3, 'vel': 5, 'lo': 2, 'hi': 9}, {'reference': 0, 'pixel': 1, 'increment': -2, 'quadratic': 3, 'velocity_increment': -5, 'interval': [12, 19]}), ({'L': 12, 'r': 7, 'p': 3, 'step': 2, 'q': 3, 'vel': 5, 'lo': 3, 'hi': 4}, {'reference': 6, 'pixel': 10, 'increment': -2, 'quadratic': 3, 'velocity_increment': -5, 'interval': [9, 10]})], 3: [({'L': 20, 'r': 8, 'p': 3, 'step': 2, 'q': 3, 'vel': 5, 'lo': 2, 'hi': 9}, {'reference': 13, 'pixel': 18, 'increment': -2, 'quadratic': 3, 'velocity_increment': -5, 'interval': [12, 19]}), ({'L': 1, 'r': 3, 'p': 1, 'step': 2, 'q': 3, 'vel': 5, 'lo': 1, 'hi': 1}, {'reference': -1, 'pixel': 1, 'increment': -2, 'quadratic': 3, 'velocity_increment': -5, 'interval': [1, 1]}), ({'L': 20, 'r': 8, 'p': 3, 'step': -3, 'q': 3, 'vel': -7, 'lo': 2, 'hi': 9}, {'reference': 13, 'pixel': 18, 'increment': 3, 'quadratic': 3, 'velocity_increment': 7, 'interval': [12, 19]}), ({'L': 20, 'r': 8, 'p': 3, 'step': 2, 'q': 0, 'vel': 5, 'lo': 2, 'hi': 9}, {'reference': 13, 'pixel': 18, 'increment': -2, 'quadratic': 0, 'velocity_increment': -5, 'interval': [12, 19]}), ({'L': 20, 'r': 22, 'p': 20, 'step': 2, 'q': 3, 'vel': 5, 'lo': 2, 'hi': 9}, {'reference': -1, 'pixel': 1, 'increment': -2, 'quadratic': 3, 'velocity_increment': -5, 'interval': [12, 19]}), ({'L': 12, 'r': 8, 'p': 3, 'step': 2, 'q': 3, 'vel': 5, 'lo': 3, 'hi': 4}, {'reference': 5, 'pixel': 10, 'increment': -2, 'quadratic': 3, 'velocity_increment': -5, 'interval': [9, 10]})], 4: [({'L': 20, 'r': 9, 'p': 3, 'step': 2, 'q': 3, 'vel': 5, 'lo': 2, 'hi': 9}, {'reference': 12, 'pixel': 18, 'increment': -2, 'quadratic': 3, 'velocity_increment': -5, 'interval': [12, 19]}), ({'L': 1, 'r': 4, 'p': 1, 'step': 2, 'q': 3, 'vel': 5, 'lo': 1, 'hi': 1}, {'reference': -2, 'pixel': 1, 'increment': -2, 'quadratic': 3, 'velocity_increment': -5, 'interval': [1, 1]}), ({'L': 20, 'r': 9, 'p': 3, 'step': -3, 'q': 3, 'vel': -7, 'lo': 2, 'hi': 9}, {'reference': 12, 'pixel': 18, 'increment': 3, 'quadratic': 3, 'velocity_increment': 7, 'interval': [12, 19]}), ({'L': 20, 'r': 9, 'p': 3, 'step': 2, 'q': 0, 'vel': 5, 'lo': 2, 'hi': 9}, {'reference': 12, 'pixel': 18, 'increment': -2, 'quadratic': 0, 'velocity_increment': -5, 'interval': [12, 19]}), ({'L': 20, 'r': 23, 'p': 20, 'step': 2, 'q': 3, 'vel': 5, 'lo': 2, 'hi': 9}, {'reference': -2, 'pixel': 1, 'increment': -2, 'quadratic': 3, 'velocity_increment': -5, 'interval': [12, 19]}), ({'L': 12, 'r': 9, 'p': 3, 'step': 2, 'q': 3, 'vel': 5, 'lo': 3, 'hi': 4}, {'reference': 4, 'pixel': 10, 'increment': -2, 'quadratic': 3, 'velocity_increment': -5, 'interval': [9, 10]})], 5: [({'L': 20, 'r': 10, 'p': 3, 'step': 2, 'q': 3, 'vel': 5, 'lo': 2, 'hi': 9}, {'reference': 11, 'pixel': 18, 'increment': -2, 'quadratic': 3, 'velocity_increment': -5, 'interval': [12, 19]}), ({'L': 1, 'r': 5, 'p': 1, 'step': 2, 'q': 3, 'vel': 5, 'lo': 1, 'hi': 1}, {'reference': -3, 'pixel': 1, 'increment': -2, 'quadratic': 3, 'velocity_increment': -5, 'interval': [1, 1]}), ({'L': 20, 'r': 10, 'p': 3, 'step': -3, 'q': 3, 'vel': -7, 'lo': 2, 'hi': 9}, {'reference': 11, 'pixel': 18, 'increment': 3, 'quadratic': 3, 'velocity_increment': 7, 'interval': [12, 19]}), ({'L': 20, 'r': 10, 'p': 3, 'step': 2, 'q': 0, 'vel': 5, 'lo': 2, 'hi': 9}, {'reference': 11, 'pixel': 18, 'increment': -2, 'quadratic': 0, 'velocity_increment': -5, 'interval': [12, 19]}), ({'L': 20, 'r': 24, 'p': 20, 'step': 2, 'q': 3, 'vel': 5, 'lo': 2, 'hi': 9}, {'reference': -3, 'pixel': 1, 'increment': -2, 'quadratic': 3, 'velocity_increment': -5, 'interval': [12, 19]}), ({'L': 12, 'r': 10, 'p': 3, 'step': 2, 'q': 3, 'vel': 5, 'lo': 3, 'hi': 4}, {'reference': 3, 'pixel': 10, 'increment': -2, 'quadratic': 3, 'velocity_increment': -5, 'interval': [9, 10]})]}
for i, (record, expected) in enumerate(fixtures[N]):
    check('astronomical fixture %s' % i, solve(record), 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
astronomical fixture 0{'increment': -2, 'interval': [12, 19], 'pixel': 18, 'quadratic': 3, 'reference': 15, 'velocity_increment': 5}{'increment': -2, 'interval': [12, 19], 'pixel': 18, 'quadratic': 3, 'reference': 15, 'velocity_increment': -5}Failed
astronomical fixture 1{'increment': -2, 'interval': [1, 1], 'pixel': 1, 'quadratic': 3, 'reference': 1, 'velocity_increment': 5}{'increment': -2, 'interval': [1, 1], 'pixel': 1, 'quadratic': 3, 'reference': 1, 'velocity_increment': -5}Failed
astronomical fixture 2{'increment': 3, 'interval': [12, 19], 'pixel': 18, 'quadratic': 3, 'reference': 15, 'velocity_increment': -7}{'increment': 3, 'interval': [12, 19], 'pixel': 18, 'quadratic': 3, 'reference': 15, 'velocity_increment': 7}Failed
astronomical fixture 3{'increment': -2, 'interval': [12, 19], 'pixel': 18, 'quadratic': 0, 'reference': 15, 'velocity_increment': 5}{'increment': -2, 'interval': [12, 19], 'pixel': 18, 'quadratic': 0, 'reference': 15, 'velocity_increment': -5}Failed
astronomical fixture 4{'increment': -2, 'interval': [12, 19], 'pixel': 1, 'quadratic': 3, 'reference': 1, 'velocity_increment': 5}{'increment': -2, 'interval': [12, 19], 'pixel': 1, 'quadratic': 3, 'reference': 1, 'velocity_increment': -5}Failed
astronomical fixture 5{'increment': -2, 'interval': [9, 10], 'pixel': 10, 'quadratic': 3, 'reference': 7, 'velocity_increment': 5}{'increment': -2, 'interval': [9, 10], 'pixel': 10, 'quadratic': 3, 'reference': 7, 'velocity_increment': -5}Failed

SHA-256 / 6855dee3697ff4cc099946aad4c57de770f5271c3f439802a3310d9992535bc9

2 / The unsuccessful fix

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

N = 1
observations = []
def solve(d):
    return {'reference': d['L']+1-d['r'], 'pixel': d['L']+1-d['p'], 'increment': -d['step'], 'quadratic': d['q'], 'velocity_increment': -d['step'], 'interval': [d['L']+1-d['hi'],d['L']+1-d['lo']]}
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = {1: [({'L': 20, 'r': 6, 'p': 3, 'step': 2, 'q': 3, 'vel': 5, 'lo': 2, 'hi': 9}, {'reference': 15, 'pixel': 18, 'increment': -2, 'quadratic': 3, 'velocity_increment': -5, 'interval': [12, 19]}), ({'L': 1, 'r': 1, 'p': 1, 'step': 2, 'q': 3, 'vel': 5, 'lo': 1, 'hi': 1}, {'reference': 1, 'pixel': 1, 'increment': -2, 'quadratic': 3, 'velocity_increment': -5, 'interval': [1, 1]}), ({'L': 20, 'r': 6, 'p': 3, 'step': -3, 'q': 3, 'vel': -7, 'lo': 2, 'hi': 9}, {'reference': 15, 'pixel': 18, 'increment': 3, 'quadratic': 3, 'velocity_increment': 7, 'interval': [12, 19]}), ({'L': 20, 'r': 6, 'p': 3, 'step': 2, 'q': 0, 'vel': 5, 'lo': 2, 'hi': 9}, {'reference': 15, 'pixel': 18, 'increment': -2, 'quadratic': 0, 'velocity_increment': -5, 'interval': [12, 19]}), ({'L': 20, 'r': 20, 'p': 20, 'step': 2, 'q': 3, 'vel': 5, 'lo': 2, 'hi': 9}, {'reference': 1, 'pixel': 1, 'increment': -2, 'quadratic': 3, 'velocity_increment': -5, 'interval': [12, 19]}), ({'L': 12, 'r': 6, 'p': 3, 'step': 2, 'q': 3, 'vel': 5, 'lo': 3, 'hi': 4}, {'reference': 7, 'pixel': 10, 'increment': -2, 'quadratic': 3, 'velocity_increment': -5, 'interval': [9, 10]})], 2: [({'L': 20, 'r': 7, 'p': 3, 'step': 2, 'q': 3, 'vel': 5, 'lo': 2, 'hi': 9}, {'reference': 14, 'pixel': 18, 'increment': -2, 'quadratic': 3, 'velocity_increment': -5, 'interval': [12, 19]}), ({'L': 1, 'r': 2, 'p': 1, 'step': 2, 'q': 3, 'vel': 5, 'lo': 1, 'hi': 1}, {'reference': 0, 'pixel': 1, 'increment': -2, 'quadratic': 3, 'velocity_increment': -5, 'interval': [1, 1]}), ({'L': 20, 'r': 7, 'p': 3, 'step': -3, 'q': 3, 'vel': -7, 'lo': 2, 'hi': 9}, {'reference': 14, 'pixel': 18, 'increment': 3, 'quadratic': 3, 'velocity_increment': 7, 'interval': [12, 19]}), ({'L': 20, 'r': 7, 'p': 3, 'step': 2, 'q': 0, 'vel': 5, 'lo': 2, 'hi': 9}, {'reference': 14, 'pixel': 18, 'increment': -2, 'quadratic': 0, 'velocity_increment': -5, 'interval': [12, 19]}), ({'L': 20, 'r': 21, 'p': 20, 'step': 2, 'q': 3, 'vel': 5, 'lo': 2, 'hi': 9}, {'reference': 0, 'pixel': 1, 'increment': -2, 'quadratic': 3, 'velocity_increment': -5, 'interval': [12, 19]}), ({'L': 12, 'r': 7, 'p': 3, 'step': 2, 'q': 3, 'vel': 5, 'lo': 3, 'hi': 4}, {'reference': 6, 'pixel': 10, 'increment': -2, 'quadratic': 3, 'velocity_increment': -5, 'interval': [9, 10]})], 3: [({'L': 20, 'r': 8, 'p': 3, 'step': 2, 'q': 3, 'vel': 5, 'lo': 2, 'hi': 9}, {'reference': 13, 'pixel': 18, 'increment': -2, 'quadratic': 3, 'velocity_increment': -5, 'interval': [12, 19]}), ({'L': 1, 'r': 3, 'p': 1, 'step': 2, 'q': 3, 'vel': 5, 'lo': 1, 'hi': 1}, {'reference': -1, 'pixel': 1, 'increment': -2, 'quadratic': 3, 'velocity_increment': -5, 'interval': [1, 1]}), ({'L': 20, 'r': 8, 'p': 3, 'step': -3, 'q': 3, 'vel': -7, 'lo': 2, 'hi': 9}, {'reference': 13, 'pixel': 18, 'increment': 3, 'quadratic': 3, 'velocity_increment': 7, 'interval': [12, 19]}), ({'L': 20, 'r': 8, 'p': 3, 'step': 2, 'q': 0, 'vel': 5, 'lo': 2, 'hi': 9}, {'reference': 13, 'pixel': 18, 'increment': -2, 'quadratic': 0, 'velocity_increment': -5, 'interval': [12, 19]}), ({'L': 20, 'r': 22, 'p': 20, 'step': 2, 'q': 3, 'vel': 5, 'lo': 2, 'hi': 9}, {'reference': -1, 'pixel': 1, 'increment': -2, 'quadratic': 3, 'velocity_increment': -5, 'interval': [12, 19]}), ({'L': 12, 'r': 8, 'p': 3, 'step': 2, 'q': 3, 'vel': 5, 'lo': 3, 'hi': 4}, {'reference': 5, 'pixel': 10, 'increment': -2, 'quadratic': 3, 'velocity_increment': -5, 'interval': [9, 10]})], 4: [({'L': 20, 'r': 9, 'p': 3, 'step': 2, 'q': 3, 'vel': 5, 'lo': 2, 'hi': 9}, {'reference': 12, 'pixel': 18, 'increment': -2, 'quadratic': 3, 'velocity_increment': -5, 'interval': [12, 19]}), ({'L': 1, 'r': 4, 'p': 1, 'step': 2, 'q': 3, 'vel': 5, 'lo': 1, 'hi': 1}, {'reference': -2, 'pixel': 1, 'increment': -2, 'quadratic': 3, 'velocity_increment': -5, 'interval': [1, 1]}), ({'L': 20, 'r': 9, 'p': 3, 'step': -3, 'q': 3, 'vel': -7, 'lo': 2, 'hi': 9}, {'reference': 12, 'pixel': 18, 'increment': 3, 'quadratic': 3, 'velocity_increment': 7, 'interval': [12, 19]}), ({'L': 20, 'r': 9, 'p': 3, 'step': 2, 'q': 0, 'vel': 5, 'lo': 2, 'hi': 9}, {'reference': 12, 'pixel': 18, 'increment': -2, 'quadratic': 0, 'velocity_increment': -5, 'interval': [12, 19]}), ({'L': 20, 'r': 23, 'p': 20, 'step': 2, 'q': 3, 'vel': 5, 'lo': 2, 'hi': 9}, {'reference': -2, 'pixel': 1, 'increment': -2, 'quadratic': 3, 'velocity_increment': -5, 'interval': [12, 19]}), ({'L': 12, 'r': 9, 'p': 3, 'step': 2, 'q': 3, 'vel': 5, 'lo': 3, 'hi': 4}, {'reference': 4, 'pixel': 10, 'increment': -2, 'quadratic': 3, 'velocity_increment': -5, 'interval': [9, 10]})], 5: [({'L': 20, 'r': 10, 'p': 3, 'step': 2, 'q': 3, 'vel': 5, 'lo': 2, 'hi': 9}, {'reference': 11, 'pixel': 18, 'increment': -2, 'quadratic': 3, 'velocity_increment': -5, 'interval': [12, 19]}), ({'L': 1, 'r': 5, 'p': 1, 'step': 2, 'q': 3, 'vel': 5, 'lo': 1, 'hi': 1}, {'reference': -3, 'pixel': 1, 'increment': -2, 'quadratic': 3, 'velocity_increment': -5, 'interval': [1, 1]}), ({'L': 20, 'r': 10, 'p': 3, 'step': -3, 'q': 3, 'vel': -7, 'lo': 2, 'hi': 9}, {'reference': 11, 'pixel': 18, 'increment': 3, 'quadratic': 3, 'velocity_increment': 7, 'interval': [12, 19]}), ({'L': 20, 'r': 10, 'p': 3, 'step': 2, 'q': 0, 'vel': 5, 'lo': 2, 'hi': 9}, {'reference': 11, 'pixel': 18, 'increment': -2, 'quadratic': 0, 'velocity_increment': -5, 'interval': [12, 19]}), ({'L': 20, 'r': 24, 'p': 20, 'step': 2, 'q': 3, 'vel': 5, 'lo': 2, 'hi': 9}, {'reference': -3, 'pixel': 1, 'increment': -2, 'quadratic': 3, 'velocity_increment': -5, 'interval': [12, 19]}), ({'L': 12, 'r': 10, 'p': 3, 'step': 2, 'q': 3, 'vel': 5, 'lo': 3, 'hi': 4}, {'reference': 3, 'pixel': 10, 'increment': -2, 'quadratic': 3, 'velocity_increment': -5, 'interval': [9, 10]})]}
for i, (record, expected) in enumerate(fixtures[N]):
    check('astronomical fixture %s' % i, solve(record), 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
astronomical fixture 0{'increment': -2, 'interval': [12, 19], 'pixel': 18, 'quadratic': 3, 'reference': 15, 'velocity_increment': -2}{'increment': -2, 'interval': [12, 19], 'pixel': 18, 'quadratic': 3, 'reference': 15, 'velocity_increment': -5}Failed
astronomical fixture 1{'increment': -2, 'interval': [1, 1], 'pixel': 1, 'quadratic': 3, 'reference': 1, 'velocity_increment': -2}{'increment': -2, 'interval': [1, 1], 'pixel': 1, 'quadratic': 3, 'reference': 1, 'velocity_increment': -5}Failed
astronomical fixture 2{'increment': 3, 'interval': [12, 19], 'pixel': 18, 'quadratic': 3, 'reference': 15, 'velocity_increment': 3}{'increment': 3, 'interval': [12, 19], 'pixel': 18, 'quadratic': 3, 'reference': 15, 'velocity_increment': 7}Failed
astronomical fixture 3{'increment': -2, 'interval': [12, 19], 'pixel': 18, 'quadratic': 0, 'reference': 15, 'velocity_increment': -2}{'increment': -2, 'interval': [12, 19], 'pixel': 18, 'quadratic': 0, 'reference': 15, 'velocity_increment': -5}Failed
astronomical fixture 4{'increment': -2, 'interval': [12, 19], 'pixel': 1, 'quadratic': 3, 'reference': 1, 'velocity_increment': -2}{'increment': -2, 'interval': [12, 19], 'pixel': 1, 'quadratic': 3, 'reference': 1, 'velocity_increment': -5}Failed
astronomical fixture 5{'increment': -2, 'interval': [9, 10], 'pixel': 10, 'quadratic': 3, 'reference': 7, 'velocity_increment': -2}{'increment': -2, 'interval': [9, 10], 'pixel': 10, 'quadratic': 3, 'reference': 7, 'velocity_increment': -5}Failed

SHA-256 / 42aed1dd67973f95cee18006b5de451ba91da781c79c9b925b265cd71b3f338e

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.

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Verification & scope

Explicitly stipulated finite algebraic adapter; no standards conformance, physical accuracy, or production-library claim. Inputs are the documented finite valid model domain. 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 2026-09-29T14:45:52.864565+00:00.

Case digest / 0369f0fbd16b37978ffdf0f3d82186b17990c94759538dfa369e8920be460aa0