Hmm, I always write subitem, not sub-item, as if it's a single word.

Or change the renaming config of serde?

subItems, sub_items, subitems

However, considering that it has already been released, it may be necessary to consider breaking

It is a breaking change (although the breakage is minimal). If we had come up with this initially, fine, but now, I don't think it's worth the breakage.

I wouldn't be that worried about the breaking change, most users didn't even update yet. There are more people who win the lottery than those who might be affected by this.

True, on the other hand I wouldn't be worried about this change either. If it was something clearly better, maybe.

Can we merge now?
It's best to merge as soon as possible, otherwise users will be confused about the schema

I still think we should not merge this, but I agree that if we do we should do it now.

Btw, this PR doesn't have any breaking, it's just to make the schema correct