Board Thread:New Features/@comment-24739709-20150518230347/@comment-5288784-20150630174013

Hmm, I'll take a guess and say that "default" should take full control. It may contain some placeholder such as "unknown" and you wouldn't want to add units to that.

EDIT: Also, you still need to insert triple brackets in the format tag, so you could technically have anything displayed there completely unrelated to the data field if you omitted that.