Issue on group positioning
Various sized layer group's Y position was nudged -6px on every 'automatic spacing update' when using the 'middle' expression. 

btw, it would be very handy if there is a way to fix the group's position, that way we don't have to manually put it back where it was when rearranging its sub-layers 😄

You are doing an incredibly good job at making a lean and to the point plugin, I have my Anima auto layout uninstalled the first minute I put my hands on this one, Anima is getting way puffier than it should and losing its primary focus. Big thumb up for paddy👍🏻 keep up the good work mate!

macOS 10.13.2 (17C88)
Sketch 48.2 (47327)