I see the negativity in some comments, but I have to say: just because we have a format that works we don't have to suffer it's slightly annoying problems for eternity.

This is a format that's very well defined, good decisions where to be flexible (quoted keys) and when to be strict (no leading zeroes, no leading plus sign, error when integer parsing can't be precise, defining all corner cases in strings).

For almost all of these, I remember cases when something went wrong (or was just annoying) in another format.

I admire efforts to fix things.