If I merge to shapes together or use a mask in Sketch 3 I want to be able to select the 'excess' and delete. For example I have a rectangle and then I overlap a circle with it. Then I want to keep the original rectangle and the overlap part of the circle but not any part of the circle that is outside of the rectangle.
So basically to keep all parts within the rectangle only. This is easy to do in Illustrator with the shape builder tool, you just select any part and can remove it. Sketch 3 seems to only have four options with shape combinations - none of which achieve this result.
I prefer Sketch 3 in every other way but its just missing this feature it seems.