JSON: object="true"

All,

Question: we need `array="true"` instead of `type="array"`, but do we
need `object="true"` instead of `type="object"`?

At least in the examples in the spec, there is no case where we both
have `object="true"` and another `type="..."`. Is there any case where
a collision might happen?

If not, we might want to change `object="true"` for `type="object"`.

WDYT?

-Erik