I think that's the opposite of what GP is advocating; they're arguing that a better approach than defining entire new formats, we should just augment existing J

I think that's the opposite of what GP is advocating; they're arguing that a better approach than defining entire new formats, we should just augment existing JSON implementations. I'd guess that the rationale is that it would be a tougher uphill battle to get people to switch to an entirely new format, but adding new features to implementations they're already using wouldn't require making anyone switch.