OptionaltoWhere the arc ends, in the sketch's x and y.
OptionalbulgeThe tangent of a quarter of the angle the arc sweeps: positive turns counterclockwise, 1 is a half circle, and 0 would be a straight line.
OptionalrelativeWhen true, to is an offset from where the pen is rather than a point of the sketch.
OptionalidA name for the command, reported with the edges it draws; leave it out to be named by position.
A point to end at and the arc's bulge, as DXF files write arcs, for
sketch.commands.bulgeArc, which makes the circular arc commandsketch.pendraws.