"""运输计划：内置山峡/云栋客户判定（合同可免）"""
from typing import Optional

INTERNAL_CUSTOMER_NAMES = frozenset(
    {
        "安庆市山峡化工有限公司",
        "安徽云栋化工有限公司",
    }
)


def is_internal_customer_name(name: Optional[str]) -> bool:
    return (name or "").strip() in INTERNAL_CUSTOMER_NAMES