Extrusion confusion

Why when extruding curves into surfaces with the gumball in rhino 8 do i get open SubD surfaces instead of open polysurfaces.

the curves are Planar.

If you create the curve with the SubDFriendly option set to yes the gumball will extrude it as a SubD. Otherwise it will be extruded as a surface/polysurface.

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Legend! thank you!

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