FA-71166 / Weather index computation / Open access

Utah chill unit accumulation: negation band sign · case 01

Mild 16 to 18 degC afternoons add chill instead of removing it.

Verified by executionVariant 1 · 8 checks per implementationDownload source bundle ↓JSON ↗

ROOT CAUSE

The 15.9-18.0 degC band carries a positive half unit.

VERIFIED REPAIR

Assign -0.5 units in the 16.0-18.0 band.

Unsuccessful approach: Using -1 applies the hot-hour penalty to mild hours.

Case contract

Hourly degC readings (None = missing hour, skipped with no effect). Units: <=1.4:0, <=2.4:0.5, <=9.1:1, <=12.4:0.5, <=15.9:0, <=18.0:-0.5, else -1. The running total is floored at zero after every hour. Return the total.

Why this case matters

Orchard dormancy and bloom forecasts depend on accumulated chill units.

1 / The failure

Exit 1

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

N = 1
observations = []
def solve(hourly):
    total = 0.0
    for t in hourly:
        if t is None:
            continue
        if t <= 1.4:
            u = 0.0
        elif t <= 2.4:
            u = 0.5
        elif t <= 9.1:
            u = 1.0
        elif t <= 12.4:
            u = 0.5
        elif t <= 15.9:
            u = 0.0
        elif t <= 18.0:
            u = 0.5
        else:
            u = -1.0
        total = max(total + u, 0.0)
    return total
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = [[['orchard night 0', [[2.4, 2.4, 12.5, 18.1, None, 1.4, 18.1, 5.0, 22.0, 12.5, 2.5, 5.0]], 2.0], ['orchard night 1', [[9.2, 18.0, 2.4, 2.4, 12.4, 2.5, 22.0, 12.4, 0.0, 9.1, 2.5, 1.4]], 4.0], ['orchard night 2', [[18.0, 0.0, 18.1, 2.4, 2.5, 22.0, 22.0, None, 16.0, 1.5, 1.5, 1.4]], 1.0], ['orchard night 3', [[None, 15.9, 1.4, 0.0, 9.1, 12.4, 1.5, 2.5, 12.5, 18.1, 2.4, 1.4]], 2.5], ['orchard night 4', [[5.0, 12.5, 9.1, 1.5, 22.0, 1.5, 1.4, 1.4, 15.9, 2.4, 9.1, 12.5]], 3.5], ['orchard night 5', [[0.0, 15.9, 2.5, 12.4, 18.0, 0.0, 1.4, 1.4, 2.5, 12.4, 15.9, 12.4]], 3.0], ['orchard night 6', [[22.0, 15.9, 12.4, 9.2, 12.4, 0.0, 5.0, 2.4, 22.0, 1.4, 9.1, None]], 3.0], ['orchard night 8', [[18.1, 22.0, 2.5, 18.0, 12.5, 2.4, 5.0, 9.1, None, 2.4, 2.5, 15.9]], 4.5]], [['orchard night 7', [[None, 5.0, 12.4, 0.0, 22.0, 18.1, 2.5, 9.2, None, None, 1.4, 12.5]], 1.5], ['orchard night 8', [[18.1, 22.0, 2.5, 18.0, 12.5, 2.4, 5.0, 9.1, None, 2.4, 2.5, 15.9]], 4.5], ['orchard night 9', [[2.5, None, 1.4, 18.0, None, 12.4, 5.0, None, 22.0, 18.1, 5.0, 18.1]], 0.0], ['orchard night 10', [[12.4, 2.4, 12.4, None, 9.1, 0.0, 12.4, 18.1, 9.1, 12.5, 1.4, 9.1]], 4.0], ['orchard night 11', [[9.1, 5.0, 18.1, 2.5, 5.0, 1.4, 9.1, None, 15.9, 2.4, 2.4, 18.1]], 4.0], ['orchard night 12', [[9.2, 16.0, 0.0, 9.2, 2.5, 15.9, 0.0, 9.2, 0.0, 0.0, 9.2, 2.5]], 3.5], ['orchard night 13', [[2.5, 15.9, 1.4, 12.5, 5.0, 1.4, 12.4, 2.4, 18.1, 0.0, 1.4, 12.4]], 2.5], ['orchard night 28', [[9.2, 16.0, 15.9, 0.0, 5.0, 12.5, 22.0, 12.4, 2.4, 9.1, 18.0, 0.0]], 1.5]], [['orchard night 14', [[1.4, 1.4, 18.0, 16.0, 12.4, 2.4, 15.9, 18.1, 18.0, 2.4, 0.0, 18.0]], 0.0], ['orchard night 15', [[1.5, 2.4, 12.5, 16.0, 16.0, 12.4, 12.4, 12.4, 18.0, 18.0, 2.5, 1.5]], 2.0], ['orchard night 16', [[16.0, 1.5, 22.0, 1.5, 12.5, 12.4, 1.4, 9.1, 22.0, 9.1, 9.1, 15.9]], 3.0], ['orchard night 17', [[1.5, 12.5, 9.2, 1.4, None, 0.0, 15.9, 12.5, 0.0, 16.0, 2.4, 12.4]], 1.5], ['orchard night 18', [[15.9, 9.2, 9.1, 15.9, 9.2, 15.9, 15.9, 9.2, 22.0, 12.4, 2.4, None]], 2.5], ['orchard night 19', [[16.0, 1.5, 18.1, 9.1, 22.0, 16.0, 12.4, 16.0, 12.4, 12.5, 2.4, 22.0]], 0.0], ['orchard night 20', [[1.5, None, 18.0, 1.4, 18.1, 9.2, 9.1, 2.5, 2.5, 2.4, 2.5, 9.2]], 5.5], ['orchard night 21', [[9.1, 16.0, 15.9, 9.2, 5.0, 0.0, 9.2, 16.0, 18.0, 12.5, 9.2, 18.0]], 1.5]], [['orchard night 5', [[0.0, 15.9, 2.5, 12.4, 18.0, 0.0, 1.4, 1.4, 2.5, 12.4, 15.9, 12.4]], 3.0], ['orchard night 19', [[16.0, 1.5, 18.1, 9.1, 22.0, 16.0, 12.4, 16.0, 12.4, 12.5, 2.4, 22.0]], 0.0], ['orchard night 21', [[9.1, 16.0, 15.9, 9.2, 5.0, 0.0, 9.2, 16.0, 18.0, 12.5, 9.2, 18.0]], 1.5], ['orchard night 22', [[1.5, 22.0, 2.5, 2.4, 12.5, 12.4, 22.0, 2.5, 15.9, 18.1, 1.5, 9.1]], 2.5], ['orchard night 23', [[2.4, 16.0, 18.0, 1.5, 15.9, 16.0, 9.1, 9.2, 1.5, 12.5, 16.0, 22.0]], 0.5], ['orchard night 24', [[2.5, 16.0, 2.5, 18.0, 18.0, 12.5, 22.0, 9.1, 12.4, 5.0, 9.1, 1.4]], 3.5], ['orchard night 25', [[0.0, None, 5.0, 22.0, 5.0, 9.1, 2.4, 1.4, 5.0, 9.1, 22.0, 2.4]], 4.0], ['orchard night 26', [[5.0, 9.1, None, 18.1, 9.2, None, 0.0, 2.5, 22.0, 15.9, 18.1, 15.9]], 0.5]], [['orchard night 0', [[2.4, 2.4, 12.5, 18.1, None, 1.4, 18.1, 5.0, 22.0, 12.5, 2.5, 5.0]], 2.0], ['orchard night 23', [[2.4, 16.0, 18.0, 1.5, 15.9, 16.0, 9.1, 9.2, 1.5, 12.5, 16.0, 22.0]], 0.5], ['orchard night 24', [[2.5, 16.0, 2.5, 18.0, 18.0, 12.5, 22.0, 9.1, 12.4, 5.0, 9.1, 1.4]], 3.5], ['orchard night 28', [[9.2, 16.0, 15.9, 0.0, 5.0, 12.5, 22.0, 12.4, 2.4, 9.1, 18.0, 0.0]], 1.5], ['orchard night 29', [[5.0, 12.5, 18.1, 2.4, 1.4, 9.2, 1.4, 1.4, None, None, 18.0, 15.9]], 0.5], ['warm spell after chill', [[5.0, 5.0, 20.0, 20.0, 20.0, 5.0]], 1.0], ['gap mid night', [[5.0, None, 5.0]], 2.0], ['warm start', [[19.0, 19.0, 6.0]], 1.0]]]
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
orchard night 0	`2.0`	`2.0`	Passed
orchard night 1	`5.0`	`4.0`	Failed
orchard night 2	`1.5`	`1.0`	Failed
orchard night 3	`2.5`	`2.5`	Passed
orchard night 4	`3.5`	`3.5`	Passed
orchard night 5	`4.0`	`3.0`	Failed
orchard night 6	`3.0`	`3.0`	Passed
orchard night 8	`5.5`	`4.5`	Failed

SHA-256 / cf8db1d514573cce470f5cb16b8ef7e7d8f79022e925dc6220b931631e6ee536

2 / The unsuccessful fix

Exit 1

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

N = 1
observations = []
def solve(hourly):
    total = 0.0
    for t in hourly:
        if t is None:
            continue
        if t <= 1.4:
            u = 0.0
        elif t <= 2.4:
            u = 0.5
        elif t <= 9.1:
            u = 1.0
        elif t <= 12.4:
            u = 0.5
        elif t <= 15.9:
            u = 0.0
        elif t <= 18.0:
            u = -1.0
        else:
            u = -1.0
        total = max(total + u, 0.0)
    return total
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = [[['orchard night 0', [[2.4, 2.4, 12.5, 18.1, None, 1.4, 18.1, 5.0, 22.0, 12.5, 2.5, 5.0]], 2.0], ['orchard night 1', [[9.2, 18.0, 2.4, 2.4, 12.4, 2.5, 22.0, 12.4, 0.0, 9.1, 2.5, 1.4]], 4.0], ['orchard night 2', [[18.0, 0.0, 18.1, 2.4, 2.5, 22.0, 22.0, None, 16.0, 1.5, 1.5, 1.4]], 1.0], ['orchard night 3', [[None, 15.9, 1.4, 0.0, 9.1, 12.4, 1.5, 2.5, 12.5, 18.1, 2.4, 1.4]], 2.5], ['orchard night 4', [[5.0, 12.5, 9.1, 1.5, 22.0, 1.5, 1.4, 1.4, 15.9, 2.4, 9.1, 12.5]], 3.5], ['orchard night 5', [[0.0, 15.9, 2.5, 12.4, 18.0, 0.0, 1.4, 1.4, 2.5, 12.4, 15.9, 12.4]], 3.0], ['orchard night 6', [[22.0, 15.9, 12.4, 9.2, 12.4, 0.0, 5.0, 2.4, 22.0, 1.4, 9.1, None]], 3.0], ['orchard night 8', [[18.1, 22.0, 2.5, 18.0, 12.5, 2.4, 5.0, 9.1, None, 2.4, 2.5, 15.9]], 4.5]], [['orchard night 7', [[None, 5.0, 12.4, 0.0, 22.0, 18.1, 2.5, 9.2, None, None, 1.4, 12.5]], 1.5], ['orchard night 8', [[18.1, 22.0, 2.5, 18.0, 12.5, 2.4, 5.0, 9.1, None, 2.4, 2.5, 15.9]], 4.5], ['orchard night 9', [[2.5, None, 1.4, 18.0, None, 12.4, 5.0, None, 22.0, 18.1, 5.0, 18.1]], 0.0], ['orchard night 10', [[12.4, 2.4, 12.4, None, 9.1, 0.0, 12.4, 18.1, 9.1, 12.5, 1.4, 9.1]], 4.0], ['orchard night 11', [[9.1, 5.0, 18.1, 2.5, 5.0, 1.4, 9.1, None, 15.9, 2.4, 2.4, 18.1]], 4.0], ['orchard night 12', [[9.2, 16.0, 0.0, 9.2, 2.5, 15.9, 0.0, 9.2, 0.0, 0.0, 9.2, 2.5]], 3.5], ['orchard night 13', [[2.5, 15.9, 1.4, 12.5, 5.0, 1.4, 12.4, 2.4, 18.1, 0.0, 1.4, 12.4]], 2.5], ['orchard night 28', [[9.2, 16.0, 15.9, 0.0, 5.0, 12.5, 22.0, 12.4, 2.4, 9.1, 18.0, 0.0]], 1.5]], [['orchard night 14', [[1.4, 1.4, 18.0, 16.0, 12.4, 2.4, 15.9, 18.1, 18.0, 2.4, 0.0, 18.0]], 0.0], ['orchard night 15', [[1.5, 2.4, 12.5, 16.0, 16.0, 12.4, 12.4, 12.4, 18.0, 18.0, 2.5, 1.5]], 2.0], ['orchard night 16', [[16.0, 1.5, 22.0, 1.5, 12.5, 12.4, 1.4, 9.1, 22.0, 9.1, 9.1, 15.9]], 3.0], ['orchard night 17', [[1.5, 12.5, 9.2, 1.4, None, 0.0, 15.9, 12.5, 0.0, 16.0, 2.4, 12.4]], 1.5], ['orchard night 18', [[15.9, 9.2, 9.1, 15.9, 9.2, 15.9, 15.9, 9.2, 22.0, 12.4, 2.4, None]], 2.5], ['orchard night 19', [[16.0, 1.5, 18.1, 9.1, 22.0, 16.0, 12.4, 16.0, 12.4, 12.5, 2.4, 22.0]], 0.0], ['orchard night 20', [[1.5, None, 18.0, 1.4, 18.1, 9.2, 9.1, 2.5, 2.5, 2.4, 2.5, 9.2]], 5.5], ['orchard night 21', [[9.1, 16.0, 15.9, 9.2, 5.0, 0.0, 9.2, 16.0, 18.0, 12.5, 9.2, 18.0]], 1.5]], [['orchard night 5', [[0.0, 15.9, 2.5, 12.4, 18.0, 0.0, 1.4, 1.4, 2.5, 12.4, 15.9, 12.4]], 3.0], ['orchard night 19', [[16.0, 1.5, 18.1, 9.1, 22.0, 16.0, 12.4, 16.0, 12.4, 12.5, 2.4, 22.0]], 0.0], ['orchard night 21', [[9.1, 16.0, 15.9, 9.2, 5.0, 0.0, 9.2, 16.0, 18.0, 12.5, 9.2, 18.0]], 1.5], ['orchard night 22', [[1.5, 22.0, 2.5, 2.4, 12.5, 12.4, 22.0, 2.5, 15.9, 18.1, 1.5, 9.1]], 2.5], ['orchard night 23', [[2.4, 16.0, 18.0, 1.5, 15.9, 16.0, 9.1, 9.2, 1.5, 12.5, 16.0, 22.0]], 0.5], ['orchard night 24', [[2.5, 16.0, 2.5, 18.0, 18.0, 12.5, 22.0, 9.1, 12.4, 5.0, 9.1, 1.4]], 3.5], ['orchard night 25', [[0.0, None, 5.0, 22.0, 5.0, 9.1, 2.4, 1.4, 5.0, 9.1, 22.0, 2.4]], 4.0], ['orchard night 26', [[5.0, 9.1, None, 18.1, 9.2, None, 0.0, 2.5, 22.0, 15.9, 18.1, 15.9]], 0.5]], [['orchard night 0', [[2.4, 2.4, 12.5, 18.1, None, 1.4, 18.1, 5.0, 22.0, 12.5, 2.5, 5.0]], 2.0], ['orchard night 23', [[2.4, 16.0, 18.0, 1.5, 15.9, 16.0, 9.1, 9.2, 1.5, 12.5, 16.0, 22.0]], 0.5], ['orchard night 24', [[2.5, 16.0, 2.5, 18.0, 18.0, 12.5, 22.0, 9.1, 12.4, 5.0, 9.1, 1.4]], 3.5], ['orchard night 28', [[9.2, 16.0, 15.9, 0.0, 5.0, 12.5, 22.0, 12.4, 2.4, 9.1, 18.0, 0.0]], 1.5], ['orchard night 29', [[5.0, 12.5, 18.1, 2.4, 1.4, 9.2, 1.4, 1.4, None, None, 18.0, 15.9]], 0.5], ['warm spell after chill', [[5.0, 5.0, 20.0, 20.0, 20.0, 5.0]], 1.0], ['gap mid night', [[5.0, None, 5.0]], 2.0], ['warm start', [[19.0, 19.0, 6.0]], 1.0]]]
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
orchard night 0	`2.0`	`2.0`	Passed
orchard night 1	`4.0`	`4.0`	Passed
orchard night 2	`1.0`	`1.0`	Passed
orchard night 3	`2.5`	`2.5`	Passed
orchard night 4	`3.5`	`3.5`	Passed
orchard night 5	`2.5`	`3.0`	Failed
orchard night 6	`3.0`	`3.0`	Passed
orchard night 8	`4.0`	`4.5`	Failed

SHA-256 / 6530a513e51b3f3b59e4b57aa81685609d44cc6bff2b937f6ea26a0bf2cb5477

3 / The verified repair

Exit 0

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

N = 1
observations = []
def solve(hourly):
    total = 0.0
    for t in hourly:
        if t is None:
            continue
        if t <= 1.4:
            u = 0.0
        elif t <= 2.4:
            u = 0.5
        elif t <= 9.1:
            u = 1.0
        elif t <= 12.4:
            u = 0.5
        elif t <= 15.9:
            u = 0.0
        elif t <= 18.0:
            u = -0.5
        else:
            u = -1.0
        total = max(total + u, 0.0)
    return total
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = [[['orchard night 0', [[2.4, 2.4, 12.5, 18.1, None, 1.4, 18.1, 5.0, 22.0, 12.5, 2.5, 5.0]], 2.0], ['orchard night 1', [[9.2, 18.0, 2.4, 2.4, 12.4, 2.5, 22.0, 12.4, 0.0, 9.1, 2.5, 1.4]], 4.0], ['orchard night 2', [[18.0, 0.0, 18.1, 2.4, 2.5, 22.0, 22.0, None, 16.0, 1.5, 1.5, 1.4]], 1.0], ['orchard night 3', [[None, 15.9, 1.4, 0.0, 9.1, 12.4, 1.5, 2.5, 12.5, 18.1, 2.4, 1.4]], 2.5], ['orchard night 4', [[5.0, 12.5, 9.1, 1.5, 22.0, 1.5, 1.4, 1.4, 15.9, 2.4, 9.1, 12.5]], 3.5], ['orchard night 5', [[0.0, 15.9, 2.5, 12.4, 18.0, 0.0, 1.4, 1.4, 2.5, 12.4, 15.9, 12.4]], 3.0], ['orchard night 6', [[22.0, 15.9, 12.4, 9.2, 12.4, 0.0, 5.0, 2.4, 22.0, 1.4, 9.1, None]], 3.0], ['orchard night 8', [[18.1, 22.0, 2.5, 18.0, 12.5, 2.4, 5.0, 9.1, None, 2.4, 2.5, 15.9]], 4.5]], [['orchard night 7', [[None, 5.0, 12.4, 0.0, 22.0, 18.1, 2.5, 9.2, None, None, 1.4, 12.5]], 1.5], ['orchard night 8', [[18.1, 22.0, 2.5, 18.0, 12.5, 2.4, 5.0, 9.1, None, 2.4, 2.5, 15.9]], 4.5], ['orchard night 9', [[2.5, None, 1.4, 18.0, None, 12.4, 5.0, None, 22.0, 18.1, 5.0, 18.1]], 0.0], ['orchard night 10', [[12.4, 2.4, 12.4, None, 9.1, 0.0, 12.4, 18.1, 9.1, 12.5, 1.4, 9.1]], 4.0], ['orchard night 11', [[9.1, 5.0, 18.1, 2.5, 5.0, 1.4, 9.1, None, 15.9, 2.4, 2.4, 18.1]], 4.0], ['orchard night 12', [[9.2, 16.0, 0.0, 9.2, 2.5, 15.9, 0.0, 9.2, 0.0, 0.0, 9.2, 2.5]], 3.5], ['orchard night 13', [[2.5, 15.9, 1.4, 12.5, 5.0, 1.4, 12.4, 2.4, 18.1, 0.0, 1.4, 12.4]], 2.5], ['orchard night 28', [[9.2, 16.0, 15.9, 0.0, 5.0, 12.5, 22.0, 12.4, 2.4, 9.1, 18.0, 0.0]], 1.5]], [['orchard night 14', [[1.4, 1.4, 18.0, 16.0, 12.4, 2.4, 15.9, 18.1, 18.0, 2.4, 0.0, 18.0]], 0.0], ['orchard night 15', [[1.5, 2.4, 12.5, 16.0, 16.0, 12.4, 12.4, 12.4, 18.0, 18.0, 2.5, 1.5]], 2.0], ['orchard night 16', [[16.0, 1.5, 22.0, 1.5, 12.5, 12.4, 1.4, 9.1, 22.0, 9.1, 9.1, 15.9]], 3.0], ['orchard night 17', [[1.5, 12.5, 9.2, 1.4, None, 0.0, 15.9, 12.5, 0.0, 16.0, 2.4, 12.4]], 1.5], ['orchard night 18', [[15.9, 9.2, 9.1, 15.9, 9.2, 15.9, 15.9, 9.2, 22.0, 12.4, 2.4, None]], 2.5], ['orchard night 19', [[16.0, 1.5, 18.1, 9.1, 22.0, 16.0, 12.4, 16.0, 12.4, 12.5, 2.4, 22.0]], 0.0], ['orchard night 20', [[1.5, None, 18.0, 1.4, 18.1, 9.2, 9.1, 2.5, 2.5, 2.4, 2.5, 9.2]], 5.5], ['orchard night 21', [[9.1, 16.0, 15.9, 9.2, 5.0, 0.0, 9.2, 16.0, 18.0, 12.5, 9.2, 18.0]], 1.5]], [['orchard night 5', [[0.0, 15.9, 2.5, 12.4, 18.0, 0.0, 1.4, 1.4, 2.5, 12.4, 15.9, 12.4]], 3.0], ['orchard night 19', [[16.0, 1.5, 18.1, 9.1, 22.0, 16.0, 12.4, 16.0, 12.4, 12.5, 2.4, 22.0]], 0.0], ['orchard night 21', [[9.1, 16.0, 15.9, 9.2, 5.0, 0.0, 9.2, 16.0, 18.0, 12.5, 9.2, 18.0]], 1.5], ['orchard night 22', [[1.5, 22.0, 2.5, 2.4, 12.5, 12.4, 22.0, 2.5, 15.9, 18.1, 1.5, 9.1]], 2.5], ['orchard night 23', [[2.4, 16.0, 18.0, 1.5, 15.9, 16.0, 9.1, 9.2, 1.5, 12.5, 16.0, 22.0]], 0.5], ['orchard night 24', [[2.5, 16.0, 2.5, 18.0, 18.0, 12.5, 22.0, 9.1, 12.4, 5.0, 9.1, 1.4]], 3.5], ['orchard night 25', [[0.0, None, 5.0, 22.0, 5.0, 9.1, 2.4, 1.4, 5.0, 9.1, 22.0, 2.4]], 4.0], ['orchard night 26', [[5.0, 9.1, None, 18.1, 9.2, None, 0.0, 2.5, 22.0, 15.9, 18.1, 15.9]], 0.5]], [['orchard night 0', [[2.4, 2.4, 12.5, 18.1, None, 1.4, 18.1, 5.0, 22.0, 12.5, 2.5, 5.0]], 2.0], ['orchard night 23', [[2.4, 16.0, 18.0, 1.5, 15.9, 16.0, 9.1, 9.2, 1.5, 12.5, 16.0, 22.0]], 0.5], ['orchard night 24', [[2.5, 16.0, 2.5, 18.0, 18.0, 12.5, 22.0, 9.1, 12.4, 5.0, 9.1, 1.4]], 3.5], ['orchard night 28', [[9.2, 16.0, 15.9, 0.0, 5.0, 12.5, 22.0, 12.4, 2.4, 9.1, 18.0, 0.0]], 1.5], ['orchard night 29', [[5.0, 12.5, 18.1, 2.4, 1.4, 9.2, 1.4, 1.4, None, None, 18.0, 15.9]], 0.5], ['warm spell after chill', [[5.0, 5.0, 20.0, 20.0, 20.0, 5.0]], 1.0], ['gap mid night', [[5.0, None, 5.0]], 2.0], ['warm start', [[19.0, 19.0, 6.0]], 1.0]]]
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
orchard night 0	`2.0`	`2.0`	Passed
orchard night 1	`4.0`	`4.0`	Passed
orchard night 2	`1.0`	`1.0`	Passed
orchard night 3	`2.5`	`2.5`	Passed
orchard night 4	`3.5`	`3.5`	Passed
orchard night 5	`3.0`	`3.0`	Passed
orchard night 6	`3.0`	`3.0`	Passed
orchard night 8	`4.5`	`4.5`	Passed

SHA-256 / f73c1a33cb6c9b7e48d675d57c0dd31618a46980067c9308a9c63c43a2ce4c17

Verification & scope

Stipulated deterministic teaching model of an operational weather index; coefficients and thresholds are fixed by the contract and no claim of standards conformance is made. 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 2026-09-29T14:48:27.302802+00:00.

Case digest / 57923de6ed0d119550cf5827f63b62d562b26f859316391131b0f235aa097612