Not, I tried using `dist_signed_squared_to_plane_v3` but profiling showed that it is 50% slower than using regular `mul_v3_m4v3` for the verts. I managed to get this number closer when manually inlining all the functions called by `dist_signed_squared_to_plane_v3`. But still `mul_v3_m4v3` was better and it makes the code simpler to understand. Also I'm changing the default mode to positive, no idea why it was negative as default in the first place. Last but not least, the operator only works well on redo. This was a problem before, not introduced by this patch.