[RC1] Negative values

[Kovas]

Starting a value with a minus sign removes the unit, which is especially frustrating when setting absolute positioning.

[iansvo]

I can replicate the behavior, it should be pretty simple to fix. I've noticed that if you have a number typed in and just throw a hypen in front of it the unit does not disappear.

Either way, we can get this tightened up for sure.