I pushed fixes for the last two TODOs in %DoRbVdh...

It fixes the problems of empty obj/array printing and solves the escaped unicode sequences with a regexp replace.

I would have liked not to involve a regexp but couldn't find a way that also preserves the newlines as \n.

The code now passes for all the 6400 messages on this feed and I will now focus on removing the signature field and doing the verification.
Now that I have a matching encoding, I don't have large doubts about this.