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You're right, instead of setting x to zero for uncomputable values it should not draw the corresponding coordinates at all. We will fix this in the next version (v3.1).

Thanks for bringing this to my attention

Hi there. When I try to graph x=(1-y^2)^(1/2) I get a half-cilinder, as expected, but also two semiplanes parallel to the y-axis extending from the "edges" of the half-cilinder. As I understand it, GC is declaring x=0 for |y|>1. A bug, maybe?