I like to work with simple whole numbers. I can't snap objects to a position on the grid at whole numbers e.g. 1cm (centimeters)? I always get a decimal location with one exception: I can place an object at 0cm exactly. Removing the header has no effect. For example, if I wish to place a field at location X=1cm and Y=1cm by attempting to snap, instead it snaps to a location of X=0.988 and Y=0.988 No matter where I drag the object it never lands on a whole number location. My grid is set at 1 cm spacing (I've tried other whole numbers also) with both the guides and dynamic guides turned off.

Try clicking the units until you get points. You should now be able to work with whole numbers. I suspect that inches and centimeters approximate points.