Sketch polygon requires a closed list of points

[lorenzncode]

A question on Discord came up regarding Sketch.polygon and calling with a list of points that were not closed.

It wasn't clear to the user that there is no option to close and they are responsible for providing a closed list of points.

pts = [
    (0, 0),
    (5, 0),
    (5, 5),
    (0, 5),
    (0, 0),  # user is responsible for closing
]

s = cq.Sketch().polygon(pts)

r = cq.Workplane().placeSketch(s).extrude(1)

I've added enhancement and docs labels. This is either an enhancement (1) or resolved with doc update (2).

1. At the OCCT level, BRepBuilderAPI_MakePolygon provides an option to close and Close() method.
   Potentially this option could be exposed in CQ in both Wire.makePolygon and Sketch.polygon
2. or a note might be added to the docs that the user is responsible for providing a closed list of points.

[jmwright]

I like option 1.

[adam-urbanczyk]

+1 for 1