Yes

Now I know the Mail app uses an uint64 to show message counts.

Welcome to London! 👋

Literally, any value can be throw in JavaScript, even `undefined`, and can be used as the value of `error.cause`. So the design of `error.cause` was lenient about such cases. In general, I think it is more like a question of practice that "would you throw a structured data in JavaScript"?

I didn't have the domain knowledge to fully understand that discussion, but it was about some Intl/Temporal APIs that are difficult to implement because some astral tables don't go far enough in the future or in the past.