But I do think the notion of immutability is more hardwired into Fan via the notion of const types and const fields.

但我相信不变性的理念在Fan中通过const类型和cons t场相比而言更加深入。

youdao

When I added rename operations, at the time it seemed like a good idea to make the last argument (which would otherwise have been const char *oldpath) optional.

添加重命名操作在那时就像是添加最后一个可选参数（否则可能应为 const char *oldpath）一样，算是很好的主意。

youdao