FA-77456 / Legal deadline computation / Open access

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

An ordinary-mail filing received late is treated as timely by its postmark.

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

ROOT CAUSE

The postmark rule is extended to ordinary mail.

VERIFIED REPAIR

At the postmark scope decision use `method == 'certified' and mailed is not None`, leaving the other decision sites of the model unchanged.

Unsuccessful approach: The partial repair `method not in ('electronic', 'mail') and mailed is not None` excludes ordinary mail but lets private courier shipments use the ship date.

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 mailed is not None:
            deemed = mailed
        elif method in ('certified', 'mail') 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]]),
  ('ordinary mail postmarked early',
   ['2024-04-15', [['mail', '2024-04-17', '2024-04-14', 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]]),
  ('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]]),
  ('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]]),
  ('courier ship date',
   ['2024-04-15', [['courier', '2024-04-17', '2024-04-15', 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]])]]
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	`[['2024-04-14', True, 0]]`	`[['2024-04-17', False, 2]]`	Failed
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 / 1ed59d919da2a957910610280de2daeb31f629a4296c1a431091fe8cca91f15a

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:
            deemed = mailed
        elif method not in ('electronic', 'mail') 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]]),
  ('ordinary mail postmarked early',
   ['2024-04-15', [['mail', '2024-04-17', '2024-04-14', 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]]),
  ('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]]),
  ('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]]),
  ('courier ship date',
   ['2024-04-15', [['courier', '2024-04-17', '2024-04-15', 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]])]]
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	`[['2024-04-15', True, 0]]`	`[['2024-04-17', False, 2]]`	Failed
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 / 86018f67119b7de5a9c6e2021054d97ec20c2d498839d0409cdd7e9c79933acd

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]]),
  ('ordinary mail postmarked early',
   ['2024-04-15', [['mail', '2024-04-17', '2024-04-14', 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]]),
  ('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]]),
  ('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]]),
  ('courier ship date',
   ['2024-04-15', [['courier', '2024-04-17', '2024-04-15', 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]])]]
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 / b949e3e53aeba11252358d590c3b2049fcea198296227f2673c3d5552d2ec514

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 2026-09-29T14:49:25.761492+00:00.

Case digest / 3142f508f05fc1c614a32c9ce7eb755206f93d8c3caac6e77369c46ae08de567