Ok, I can do that and just not test this scenario with circles (because I guess you can't).  I'll remove this test from here and add the new polygon test to the polygon-reftest branch.  That one is still outstanding b/c between the time when I submitted that PR and the time when you reviewed it, the polygon code changed quite a bit and exposed a bug making them all fail.  When the bug is cleared, I'll ping you to look at it again and in the meantime, I'll add this case to that shape instead.