Should id be optional or omitted for the Message type used for initialMessages?

[tylersayshi]

Here is the type I am referring to from the ai package

ai/packages/ui-utils/src/types.ts

Line 388 in ddf0184

initialMessages?: Message[];

it seems like the useChat hook works without an id on the initialMessages and this currently requires typecasting to make work in ts. I saw the type-cast in https://www.pronextjs.dev/ where they demo the hook and suggest type casting.

It seems like content is the only required field for it to work at runtime fwiw