FA-77451 / Legal deadline computation / Open access

Deemed filing dates under mailbox and postmark rules: prisoner rule · case 01

A prisoner filing sent by ordinary mail is dated by receipt and judged late.

Verified by executionVariant 1 · 7 checks per implementationDownload source bundle ↓JSON ↗

ROOT CAUSE

The prison mailbox rule is only applied to certified mail.

VERIFIED REPAIR

At the prisoner rule decision use `prisoner and mailed is not None`, leaving the other decision sites of the model unchanged.

Unsuccessful approach: The partial repair `prisoner and mailed is not None and mailed <= deadline` only applies the mailbox rule when it makes the filing timely, misdating late prisoner filings.

Case contract

Each filing is [method, received, mailed, prisoner]. Stipulated: a prisoner filing with a mailed date is deemed filed when delivered to the prison mail system (mailed), regardless of method; otherwise a certified-mail filing with a mailed date is deemed filed on its postmark (mailed); every other filing (ordinary mail, courier, electronic) is filed when received. Return [deemed date, timely (deemed on or before the deadline), days late (0 if timely)] per filing.

Why this case matters

Docketing systems compute filing and response deadlines from trigger events; a wrong date can forfeit a right.

1 / The failure

Exit 1

"""Failure Map reference implementation. Python standard library only."""
import json
import datetime as dt
import calendar
N = 1
observations = []
def solve(deadline, filings):
    dl = dt.date.fromisoformat(deadline)
    out = []
    for method, received, mailed, prisoner in filings:
        if prisoner and method == 'certified' and mailed is not None:
            deemed = mailed
        elif method == 'certified' and mailed is not None:
            deemed = mailed
        else:
            deemed = received
        dd = dt.date.fromisoformat(deemed)
        late = max(0, (dd - dl).days)
        out.append([deemed, dd <= dl, late])
    return out
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = [[('regression: prisoner ordinary mail',
   ['2024-04-15', [['mail', '2024-04-19', '2024-04-12', True]]],
   [['2024-04-12', True, 0]]),
  ('ordinary mail postmarked early',
   ['2024-04-15', [['mail', '2024-04-17', '2024-04-14', False]]],
   [['2024-04-17', False, 2]]),
  ('certified mail postmark',
   ['2024-04-15', [['certified', '2024-04-18', '2024-04-15', False]]],
   [['2024-04-15', True, 0]]),
  ('courier ship date',
   ['2024-04-15', [['courier', '2024-04-17', '2024-04-15', False]]],
   [['2024-04-17', False, 2]]),
  ('electronic on deadline',
   ['2024-04-15', [['electronic', '2024-04-15', None, False]]],
   [['2024-04-15', True, 0]]),
  ('early and late mix',
   ['2024-04-15', [['electronic', '2024-04-10', None, False], ['electronic', '2024-04-16', None, False]]],
   [['2024-04-10', True, 0], ['2024-04-16', False, 1]]),
  ('prisoner mailed late',
   ['2024-04-15', [['mail', '2024-04-22', '2024-04-18', True]]],
   [['2024-04-18', False, 3]])],
 [('certified mail postmark',
   ['2024-04-15', [['certified', '2024-04-18', '2024-04-15', False]]],
   [['2024-04-15', True, 0]]),
  ('courier ship date',
   ['2024-04-15', [['courier', '2024-04-17', '2024-04-15', False]]],
   [['2024-04-17', False, 2]]),
  ('electronic on deadline',
   ['2024-04-15', [['electronic', '2024-04-15', None, False]]],
   [['2024-04-15', True, 0]]),
  ('early and late mix',
   ['2024-04-15', [['electronic', '2024-04-10', None, False], ['electronic', '2024-04-16', None, False]]],
   [['2024-04-10', True, 0], ['2024-04-16', False, 1]]),
  ('prisoner mailed late',
   ['2024-04-15', [['mail', '2024-04-22', '2024-04-18', True]]],
   [['2024-04-18', False, 3]]),
  ('prisoner without mailed date',
   ['2024-04-15', [['mail', '2024-04-16', None, True]]],
   [['2024-04-16', False, 1]]),
  ('certified late postmark',
   ['2024-04-15', [['certified', '2024-04-20', '2024-04-17', False]]],
   [['2024-04-17', False, 2]])],
 [('electronic on deadline',
   ['2024-04-15', [['electronic', '2024-04-15', None, False]]],
   [['2024-04-15', True, 0]]),
  ('early and late mix',
   ['2024-04-15', [['electronic', '2024-04-10', None, False], ['electronic', '2024-04-16', None, False]]],
   [['2024-04-10', True, 0], ['2024-04-16', False, 1]]),
  ('prisoner mailed late',
   ['2024-04-15', [['mail', '2024-04-22', '2024-04-18', True]]],
   [['2024-04-18', False, 3]]),
  ('prisoner without mailed date',
   ['2024-04-15', [['mail', '2024-04-16', None, True]]],
   [['2024-04-16', False, 1]]),
  ('certified late postmark',
   ['2024-04-15', [['certified', '2024-04-20', '2024-04-17', False]]],
   [['2024-04-17', False, 2]]),
  ('one day late electronic',
   ['2024-04-15', [['electronic', '2024-04-16', None, False]]],
   [['2024-04-16', False, 1]]),
  ('prisoner certified',
   ['2024-06-01',
    [['certified', '2024-06-05', '2024-06-01', True], ['mail', '2024-05-20', '2024-05-18', False]]],
   [['2024-06-01', True, 0], ['2024-05-20', True, 0]])],
 [('prisoner mailed late',
   ['2024-04-15', [['mail', '2024-04-22', '2024-04-18', True]]],
   [['2024-04-18', False, 3]]),
  ('prisoner without mailed date',
   ['2024-04-15', [['mail', '2024-04-16', None, True]]],
   [['2024-04-16', False, 1]]),
  ('certified late postmark',
   ['2024-04-15', [['certified', '2024-04-20', '2024-04-17', False]]],
   [['2024-04-17', False, 2]]),
  ('one day late electronic',
   ['2024-04-15', [['electronic', '2024-04-16', None, False]]],
   [['2024-04-16', False, 1]]),
  ('prisoner certified',
   ['2024-06-01',
    [['certified', '2024-06-05', '2024-06-01', True], ['mail', '2024-05-20', '2024-05-18', False]]],
   [['2024-06-01', True, 0], ['2024-05-20', True, 0]]),
  ('regression: prisoner ordinary mail',
   ['2024-04-15', [['mail', '2024-04-19', '2024-04-12', True]]],
   [['2024-04-12', True, 0]]),
  ('ordinary mail postmarked early',
   ['2024-04-15', [['mail', '2024-04-17', '2024-04-14', False]]],
   [['2024-04-17', False, 2]])],
 [('certified late postmark',
   ['2024-04-15', [['certified', '2024-04-20', '2024-04-17', False]]],
   [['2024-04-17', False, 2]]),
  ('one day late electronic',
   ['2024-04-15', [['electronic', '2024-04-16', None, False]]],
   [['2024-04-16', False, 1]]),
  ('prisoner certified',
   ['2024-06-01',
    [['certified', '2024-06-05', '2024-06-01', True], ['mail', '2024-05-20', '2024-05-18', False]]],
   [['2024-06-01', True, 0], ['2024-05-20', True, 0]]),
  ('regression: prisoner ordinary mail',
   ['2024-04-15', [['mail', '2024-04-19', '2024-04-12', True]]],
   [['2024-04-12', True, 0]]),
  ('ordinary mail postmarked early',
   ['2024-04-15', [['mail', '2024-04-17', '2024-04-14', False]]],
   [['2024-04-17', False, 2]]),
  ('certified mail postmark',
   ['2024-04-15', [['certified', '2024-04-18', '2024-04-15', False]]],
   [['2024-04-15', True, 0]]),
  ('courier ship date',
   ['2024-04-15', [['courier', '2024-04-17', '2024-04-15', False]]],
   [['2024-04-17', False, 2]]),
  ('prisoner mailed late',
   ['2024-04-15', [['mail', '2024-04-22', '2024-04-18', True]]],
   [['2024-04-18', False, 3]])]]
for label, args, expected in fixtures[N-1]:
    check(label, solve(*args), 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 fixture	Actual	Expected	Outcome
regression: prisoner ordinary mail	`[['2024-04-19', False, 4]]`	`[['2024-04-12', True, 0]]`	Failed
ordinary mail postmarked early	`[['2024-04-17', False, 2]]`	`[['2024-04-17', False, 2]]`	Passed
certified mail postmark	`[['2024-04-15', True, 0]]`	`[['2024-04-15', True, 0]]`	Passed
courier ship date	`[['2024-04-17', False, 2]]`	`[['2024-04-17', False, 2]]`	Passed
electronic on deadline	`[['2024-04-15', True, 0]]`	`[['2024-04-15', True, 0]]`	Passed
early and late mix	`[['2024-04-10', True, 0], ['2024-04-16', False, 1]]`	`[['2024-04-10', True, 0], ['2024-04-16', False, 1]]`	Passed
prisoner mailed late	`[['2024-04-22', False, 7]]`	`[['2024-04-18', False, 3]]`	Failed

SHA-256 / ee5c4ce3bf093d76b501ef55f5bf0367d77f1eb32b3617b62e5d4d8dbf3963b1

2 / The unsuccessful fix

Exit 1

"""Failure Map reference implementation. Python standard library only."""
import json
import datetime as dt
import calendar
N = 1
observations = []
def solve(deadline, filings):
    dl = dt.date.fromisoformat(deadline)
    out = []
    for method, received, mailed, prisoner in filings:
        if prisoner and mailed is not None and mailed <= deadline:
            deemed = mailed
        elif method == 'certified' and mailed is not None:
            deemed = mailed
        else:
            deemed = received
        dd = dt.date.fromisoformat(deemed)
        late = max(0, (dd - dl).days)
        out.append([deemed, dd <= dl, late])
    return out
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = [[('regression: prisoner ordinary mail',
   ['2024-04-15', [['mail', '2024-04-19', '2024-04-12', True]]],
   [['2024-04-12', True, 0]]),
  ('ordinary mail postmarked early',
   ['2024-04-15', [['mail', '2024-04-17', '2024-04-14', False]]],
   [['2024-04-17', False, 2]]),
  ('certified mail postmark',
   ['2024-04-15', [['certified', '2024-04-18', '2024-04-15', False]]],
   [['2024-04-15', True, 0]]),
  ('courier ship date',
   ['2024-04-15', [['courier', '2024-04-17', '2024-04-15', False]]],
   [['2024-04-17', False, 2]]),
  ('electronic on deadline',
   ['2024-04-15', [['electronic', '2024-04-15', None, False]]],
   [['2024-04-15', True, 0]]),
  ('early and late mix',
   ['2024-04-15', [['electronic', '2024-04-10', None, False], ['electronic', '2024-04-16', None, False]]],
   [['2024-04-10', True, 0], ['2024-04-16', False, 1]]),
  ('prisoner mailed late',
   ['2024-04-15', [['mail', '2024-04-22', '2024-04-18', True]]],
   [['2024-04-18', False, 3]])],
 [('certified mail postmark',
   ['2024-04-15', [['certified', '2024-04-18', '2024-04-15', False]]],
   [['2024-04-15', True, 0]]),
  ('courier ship date',
   ['2024-04-15', [['courier', '2024-04-17', '2024-04-15', False]]],
   [['2024-04-17', False, 2]]),
  ('electronic on deadline',
   ['2024-04-15', [['electronic', '2024-04-15', None, False]]],
   [['2024-04-15', True, 0]]),
  ('early and late mix',
   ['2024-04-15', [['electronic', '2024-04-10', None, False], ['electronic', '2024-04-16', None, False]]],
   [['2024-04-10', True, 0], ['2024-04-16', False, 1]]),
  ('prisoner mailed late',
   ['2024-04-15', [['mail', '2024-04-22', '2024-04-18', True]]],
   [['2024-04-18', False, 3]]),
  ('prisoner without mailed date',
   ['2024-04-15', [['mail', '2024-04-16', None, True]]],
   [['2024-04-16', False, 1]]),
  ('certified late postmark',
   ['2024-04-15', [['certified', '2024-04-20', '2024-04-17', False]]],
   [['2024-04-17', False, 2]])],
 [('electronic on deadline',
   ['2024-04-15', [['electronic', '2024-04-15', None, False]]],
   [['2024-04-15', True, 0]]),
  ('early and late mix',
   ['2024-04-15', [['electronic', '2024-04-10', None, False], ['electronic', '2024-04-16', None, False]]],
   [['2024-04-10', True, 0], ['2024-04-16', False, 1]]),
  ('prisoner mailed late',
   ['2024-04-15', [['mail', '2024-04-22', '2024-04-18', True]]],
   [['2024-04-18', False, 3]]),
  ('prisoner without mailed date',
   ['2024-04-15', [['mail', '2024-04-16', None, True]]],
   [['2024-04-16', False, 1]]),
  ('certified late postmark',
   ['2024-04-15', [['certified', '2024-04-20', '2024-04-17', False]]],
   [['2024-04-17', False, 2]]),
  ('one day late electronic',
   ['2024-04-15', [['electronic', '2024-04-16', None, False]]],
   [['2024-04-16', False, 1]]),
  ('prisoner certified',
   ['2024-06-01',
    [['certified', '2024-06-05', '2024-06-01', True], ['mail', '2024-05-20', '2024-05-18', False]]],
   [['2024-06-01', True, 0], ['2024-05-20', True, 0]])],
 [('prisoner mailed late',
   ['2024-04-15', [['mail', '2024-04-22', '2024-04-18', True]]],
   [['2024-04-18', False, 3]]),
  ('prisoner without mailed date',
   ['2024-04-15', [['mail', '2024-04-16', None, True]]],
   [['2024-04-16', False, 1]]),
  ('certified late postmark',
   ['2024-04-15', [['certified', '2024-04-20', '2024-04-17', False]]],
   [['2024-04-17', False, 2]]),
  ('one day late electronic',
   ['2024-04-15', [['electronic', '2024-04-16', None, False]]],
   [['2024-04-16', False, 1]]),
  ('prisoner certified',
   ['2024-06-01',
    [['certified', '2024-06-05', '2024-06-01', True], ['mail', '2024-05-20', '2024-05-18', False]]],
   [['2024-06-01', True, 0], ['2024-05-20', True, 0]]),
  ('regression: prisoner ordinary mail',
   ['2024-04-15', [['mail', '2024-04-19', '2024-04-12', True]]],
   [['2024-04-12', True, 0]]),
  ('ordinary mail postmarked early',
   ['2024-04-15', [['mail', '2024-04-17', '2024-04-14', False]]],
   [['2024-04-17', False, 2]])],
 [('certified late postmark',
   ['2024-04-15', [['certified', '2024-04-20', '2024-04-17', False]]],
   [['2024-04-17', False, 2]]),
  ('one day late electronic',
   ['2024-04-15', [['electronic', '2024-04-16', None, False]]],
   [['2024-04-16', False, 1]]),
  ('prisoner certified',
   ['2024-06-01',
    [['certified', '2024-06-05', '2024-06-01', True], ['mail', '2024-05-20', '2024-05-18', False]]],
   [['2024-06-01', True, 0], ['2024-05-20', True, 0]]),
  ('regression: prisoner ordinary mail',
   ['2024-04-15', [['mail', '2024-04-19', '2024-04-12', True]]],
   [['2024-04-12', True, 0]]),
  ('ordinary mail postmarked early',
   ['2024-04-15', [['mail', '2024-04-17', '2024-04-14', False]]],
   [['2024-04-17', False, 2]]),
  ('certified mail postmark',
   ['2024-04-15', [['certified', '2024-04-18', '2024-04-15', False]]],
   [['2024-04-15', True, 0]]),
  ('courier ship date',
   ['2024-04-15', [['courier', '2024-04-17', '2024-04-15', False]]],
   [['2024-04-17', False, 2]]),
  ('prisoner mailed late',
   ['2024-04-15', [['mail', '2024-04-22', '2024-04-18', True]]],
   [['2024-04-18', False, 3]])]]
for label, args, expected in fixtures[N-1]:
    check(label, solve(*args), 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 fixture	Actual	Expected	Outcome
regression: prisoner ordinary mail	`[['2024-04-12', True, 0]]`	`[['2024-04-12', True, 0]]`	Passed
ordinary mail postmarked early	`[['2024-04-17', False, 2]]`	`[['2024-04-17', False, 2]]`	Passed
certified mail postmark	`[['2024-04-15', True, 0]]`	`[['2024-04-15', True, 0]]`	Passed
courier ship date	`[['2024-04-17', False, 2]]`	`[['2024-04-17', False, 2]]`	Passed
electronic on deadline	`[['2024-04-15', True, 0]]`	`[['2024-04-15', True, 0]]`	Passed
early and late mix	`[['2024-04-10', True, 0], ['2024-04-16', False, 1]]`	`[['2024-04-10', True, 0], ['2024-04-16', False, 1]]`	Passed
prisoner mailed late	`[['2024-04-22', False, 7]]`	`[['2024-04-18', False, 3]]`	Failed

SHA-256 / 9603defa21b1e93257bdc5acbfa3972fbddc521417d7f74c5488143a72f88573

3 / The verified repair

Exit 0

"""Failure Map reference implementation. Python standard library only."""
import json
import datetime as dt
import calendar
N = 1
observations = []
def solve(deadline, filings):
    dl = dt.date.fromisoformat(deadline)
    out = []
    for method, received, mailed, prisoner in filings:
        if prisoner and mailed is not None:
            deemed = mailed
        elif method == 'certified' and mailed is not None:
            deemed = mailed
        else:
            deemed = received
        dd = dt.date.fromisoformat(deemed)
        late = max(0, (dd - dl).days)
        out.append([deemed, dd <= dl, late])
    return out
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = [[('regression: prisoner ordinary mail',
   ['2024-04-15', [['mail', '2024-04-19', '2024-04-12', True]]],
   [['2024-04-12', True, 0]]),
  ('ordinary mail postmarked early',
   ['2024-04-15', [['mail', '2024-04-17', '2024-04-14', False]]],
   [['2024-04-17', False, 2]]),
  ('certified mail postmark',
   ['2024-04-15', [['certified', '2024-04-18', '2024-04-15', False]]],
   [['2024-04-15', True, 0]]),
  ('courier ship date',
   ['2024-04-15', [['courier', '2024-04-17', '2024-04-15', False]]],
   [['2024-04-17', False, 2]]),
  ('electronic on deadline',
   ['2024-04-15', [['electronic', '2024-04-15', None, False]]],
   [['2024-04-15', True, 0]]),
  ('early and late mix',
   ['2024-04-15', [['electronic', '2024-04-10', None, False], ['electronic', '2024-04-16', None, False]]],
   [['2024-04-10', True, 0], ['2024-04-16', False, 1]]),
  ('prisoner mailed late',
   ['2024-04-15', [['mail', '2024-04-22', '2024-04-18', True]]],
   [['2024-04-18', False, 3]])],
 [('certified mail postmark',
   ['2024-04-15', [['certified', '2024-04-18', '2024-04-15', False]]],
   [['2024-04-15', True, 0]]),
  ('courier ship date',
   ['2024-04-15', [['courier', '2024-04-17', '2024-04-15', False]]],
   [['2024-04-17', False, 2]]),
  ('electronic on deadline',
   ['2024-04-15', [['electronic', '2024-04-15', None, False]]],
   [['2024-04-15', True, 0]]),
  ('early and late mix',
   ['2024-04-15', [['electronic', '2024-04-10', None, False], ['electronic', '2024-04-16', None, False]]],
   [['2024-04-10', True, 0], ['2024-04-16', False, 1]]),
  ('prisoner mailed late',
   ['2024-04-15', [['mail', '2024-04-22', '2024-04-18', True]]],
   [['2024-04-18', False, 3]]),
  ('prisoner without mailed date',
   ['2024-04-15', [['mail', '2024-04-16', None, True]]],
   [['2024-04-16', False, 1]]),
  ('certified late postmark',
   ['2024-04-15', [['certified', '2024-04-20', '2024-04-17', False]]],
   [['2024-04-17', False, 2]])],
 [('electronic on deadline',
   ['2024-04-15', [['electronic', '2024-04-15', None, False]]],
   [['2024-04-15', True, 0]]),
  ('early and late mix',
   ['2024-04-15', [['electronic', '2024-04-10', None, False], ['electronic', '2024-04-16', None, False]]],
   [['2024-04-10', True, 0], ['2024-04-16', False, 1]]),
  ('prisoner mailed late',
   ['2024-04-15', [['mail', '2024-04-22', '2024-04-18', True]]],
   [['2024-04-18', False, 3]]),
  ('prisoner without mailed date',
   ['2024-04-15', [['mail', '2024-04-16', None, True]]],
   [['2024-04-16', False, 1]]),
  ('certified late postmark',
   ['2024-04-15', [['certified', '2024-04-20', '2024-04-17', False]]],
   [['2024-04-17', False, 2]]),
  ('one day late electronic',
   ['2024-04-15', [['electronic', '2024-04-16', None, False]]],
   [['2024-04-16', False, 1]]),
  ('prisoner certified',
   ['2024-06-01',
    [['certified', '2024-06-05', '2024-06-01', True], ['mail', '2024-05-20', '2024-05-18', False]]],
   [['2024-06-01', True, 0], ['2024-05-20', True, 0]])],
 [('prisoner mailed late',
   ['2024-04-15', [['mail', '2024-04-22', '2024-04-18', True]]],
   [['2024-04-18', False, 3]]),
  ('prisoner without mailed date',
   ['2024-04-15', [['mail', '2024-04-16', None, True]]],
   [['2024-04-16', False, 1]]),
  ('certified late postmark',
   ['2024-04-15', [['certified', '2024-04-20', '2024-04-17', False]]],
   [['2024-04-17', False, 2]]),
  ('one day late electronic',
   ['2024-04-15', [['electronic', '2024-04-16', None, False]]],
   [['2024-04-16', False, 1]]),
  ('prisoner certified',
   ['2024-06-01',
    [['certified', '2024-06-05', '2024-06-01', True], ['mail', '2024-05-20', '2024-05-18', False]]],
   [['2024-06-01', True, 0], ['2024-05-20', True, 0]]),
  ('regression: prisoner ordinary mail',
   ['2024-04-15', [['mail', '2024-04-19', '2024-04-12', True]]],
   [['2024-04-12', True, 0]]),
  ('ordinary mail postmarked early',
   ['2024-04-15', [['mail', '2024-04-17', '2024-04-14', False]]],
   [['2024-04-17', False, 2]])],
 [('certified late postmark',
   ['2024-04-15', [['certified', '2024-04-20', '2024-04-17', False]]],
   [['2024-04-17', False, 2]]),
  ('one day late electronic',
   ['2024-04-15', [['electronic', '2024-04-16', None, False]]],
   [['2024-04-16', False, 1]]),
  ('prisoner certified',
   ['2024-06-01',
    [['certified', '2024-06-05', '2024-06-01', True], ['mail', '2024-05-20', '2024-05-18', False]]],
   [['2024-06-01', True, 0], ['2024-05-20', True, 0]]),
  ('regression: prisoner ordinary mail',
   ['2024-04-15', [['mail', '2024-04-19', '2024-04-12', True]]],
   [['2024-04-12', True, 0]]),
  ('ordinary mail postmarked early',
   ['2024-04-15', [['mail', '2024-04-17', '2024-04-14', False]]],
   [['2024-04-17', False, 2]]),
  ('certified mail postmark',
   ['2024-04-15', [['certified', '2024-04-18', '2024-04-15', False]]],
   [['2024-04-15', True, 0]]),
  ('courier ship date',
   ['2024-04-15', [['courier', '2024-04-17', '2024-04-15', False]]],
   [['2024-04-17', False, 2]]),
  ('prisoner mailed late',
   ['2024-04-15', [['mail', '2024-04-22', '2024-04-18', True]]],
   [['2024-04-18', False, 3]])]]
for label, args, expected in fixtures[N-1]:
    check(label, solve(*args), 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 fixture	Actual	Expected	Outcome
regression: prisoner ordinary mail	`[['2024-04-12', True, 0]]`	`[['2024-04-12', True, 0]]`	Passed
ordinary mail postmarked early	`[['2024-04-17', False, 2]]`	`[['2024-04-17', False, 2]]`	Passed
certified mail postmark	`[['2024-04-15', True, 0]]`	`[['2024-04-15', True, 0]]`	Passed
courier ship date	`[['2024-04-17', False, 2]]`	`[['2024-04-17', False, 2]]`	Passed
electronic on deadline	`[['2024-04-15', True, 0]]`	`[['2024-04-15', True, 0]]`	Passed
early and late mix	`[['2024-04-10', True, 0], ['2024-04-16', False, 1]]`	`[['2024-04-10', True, 0], ['2024-04-16', False, 1]]`	Passed
prisoner mailed late	`[['2024-04-18', False, 3]]`	`[['2024-04-18', False, 3]]`	Passed

SHA-256 / 561bb05ab775816c156c825ca102b3b3403547df478200c1a61a835291436812

Verification & scope

Stipulated toy deadline rules evaluated offline on explicit fixtures. The contract is inspired by common court-rule structures but is not legal advice and makes no claim to reproduce any jurisdiction's rules. 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 2026-09-29T14:49:25.721247+00:00.

Case digest / fb4196fc94fd83a598c7940e50e2ce6e6168ca77c4aeb677c42f643099160914