"""只比较真实到货时间，不将未知时间或托盘编号作为先后依据。"""

from datetime import datetime
from typing import Any


def requires_fifo_skip_reason(
    pallet_id: int, arrived_at: datetime | None, candidate: dict[str, Any] | None
) -> bool:
    return bool(
        arrived_at is not None
        and candidate is not None
        and candidate['pallet_id'] != pallet_id
        and candidate['site_arrived_at'] < arrived_at
    )