Thanks for making me aware of this. I guess {...something ?? {} } and [...something ?? [] ] are then appropriate to avoid any trouble for now.

This tricks me all of the time. Part of me wants for it to work to avoid allocating an empty array object in situations like `[...opts?.foo.map(format)]`. On the other hand I appreciate the stricter type safety.

I was quite surprised by this, I was certain it wasn’t true, but I checked and it is!