UPDATE: It is fixed! No more fractional glitch. So the answer noq is "one less thing!" Pen has fractional glitches! I am drawing a big dot every 10.1 pixels, when both X and Y are "something point four" e.g. x=40.4, y=40.4 it doesn't draw!
So I was debugging some pen collision routines, and I noticed sometimes pen didn't draw! It's a glitch. Fix is to always "round" your pen coordinates. Someone is stealing our bits!
