Strange shapes when converting DXF circles to GCode

[Ger-55]

When importing a circle in DXF format in Openbuilds CAM circles flattens as shown in the figure. The DXF file is OK. Adding extra anchorpoints around the circle ( I use Adobe Illustrator ) does not help. Looking at the GCode I see that a circle is approximated by very small straight segments. This is a basic but not the best solution since GCode supports cubic splines so a circle/ellipse can be written e.g. as a four segments using four G4 statements. and 4 coordinate pairs.

circleTest.dxf.txt