I love these projects, I hope one of them someday emerges as the winner because (as it motivates all these libraries' authors) there's so much low hanging fruit and free wins changing the line format for JSON but keeping the "Good Parts" like the dead simple generic typing.

XML has EXI (Efficient XML Interchange) for precisely the reason of getting wins over the wire but keeping the nice human readable format at the ends.

TIL.

EXI looks useful. Now I just wish there was a renderer in the pugjs format as I find that terse format much pure readable than verbose XML. I also find indentation based syntax easier to visually parse hierarchical structure.