I'm +1 on the idea. Currently, a user needs to find this information in a wall of text: "To get the most compact JSON representation, you should specify (',', ':') to eliminate whitespace." It's easy to miss the lack of trailing space in (',', ':').

Perhaps the constant name could be changed to something more descriptive, but I don't have a better suggestion at the moment.

(Adding Brett since he also reviewed the PR.)