- full circle arc: endpoint match, 0 distance, perpendicular
- single point line/arc -> filled circle!
- ... or stroke shape (but with line there is no rot!)
- three different 0-long arcs:
- r=0 -> stroke rot is start angle (if spec'd)
- delta ang=0 -> stroke rot is start angle
- matching endpoints -> stroke rot is start angle or center-end
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