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Splines are not dashed.
The polygon tessellation routine has problems. It appears that the
following paper has the right answers:
http://cm.bell-labs.com/cm/cs/doc/93/2-27.ps.gz
[Hobby93c] John D. Hobby, Practical Segment Intersection with
Finite Precision Output, Computation Geometry Theory and
Applications, 13(4), 1999.
Stroking a self-intersecting path generates the wrong answer, (in
mostly subtle ways). The fix is to tessellate a giant polygon for the
entire stroke outline rather than incrementally generating trapezoids.
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