I suggest the copper cutout (clearance) around a square pin would be done as a square with rounded corners. I. e. growing the shape of the rectangle by the clearance. Now it's made as a sharp rectangle.
For example if you have a square pin which is completely included in (obscured, overlapped by) a thick line then the square pin generates notches in the surrounding copper. If my suggestion is not difficult to implement then it would mean more freedom when designing groundplanes because this notch can cut a groundplane in two. It would be also easier to place lines and polygons because with round pins, the cutout shows the pin DRC clearance. With rectangular not because it shows more than the pin DRC clearance. CL<
