> One warning about extremely large views is that at some point you will run 
> into floating-point rounding errors, since AppKit and CoreGraphics coords are 
> 32-bit floats and have only 24 bits of precision. Still, that should get you 
> to millions of pixels before the coords stop being pixel-accurate.

64-bit AppKit is much better in this regard than 32-bit.  If memory serves, it 
lets you reliably operate NSScrollViews over dimensions in the billions.
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