X11cairo with antialias="none" buggy under MacOS?

X11(antialias="none")

I obviously am going to plot to the screen device. where
a line width below one pixel does'nt make sense to me.

what am I missing?

The new "cairo" X11 device with antialiasing off can indeed look awful 
, but if you really don't want antialiasing then try using the good old 
non-cairo X11 device with the 'type' argument:

  > x11(type="Xlib")
  > plot(1:10)


Barry