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Circles of radius zero interpreted as points
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There is an interesting difference in behaviour between input
((x1)^(2)+(y1)^(2))=0
and
((x1)^(2)+(y1)^(2))*((x2)^(2)+(y2)^(2))*((x3)^(2)+(y3)^(2))=0
I'd expect the latter to be three points, but it isn't!
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Degenerate conics are all covered; degenerate higher orders not so much :)
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