well, I looked into this a bit further, and it looks like it's that the
boundary between the block change in the checker pattern is at -.001 (I
assume it's here so that a checkered plane at 0 will look ok).  This
seems pretty obvious now, and I'm kicking myself for not having realized
it earlier.  I suppose it's pretty unavoidable, so I won't post to
bugreports.

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