var a = Rect2i(4, 4, 8, 8).grow(4) # a is Rect2i(0, 0, 16, 16)
var b = Rect2i(0, 0, 8, 4).grow(2) # b is Rect2i(-2, -2, 12, 8)
var a = new Rect2I(4, 4, 8, 8).Grow(4); // a is Rect2I(0, 0, 16, 16)
var b = new Rect2I(0, 0, 8, 4).Grow(2); // b is Rect2I(-2, -2, 12, 8)