There seems to be a problem regarding how unary operators are formatted.
For example, "-1 + 2" is formatted as "- 1 + 2". The first form is correct and should not be touched by the formatter.
Ok, should be fixed for 2.0.1.
It'd be nice if you can get the latest nightly build (already published) and test for uncommon situations to see if it works for your use-cases...