Do not start with segments with multiple intersections.
Do not start with segments with multiple intersections.

Simplifies the required checks at the end, and generally reduces number edge cases.

lehni/paper.js,byte-foundry/paper.js,iconexperience/paper.js,lehni/paper.js,byte-foundry/paper.js,byte-foundry/paper.js,iconexperience/paper.js,iconexperience/paper.js,lehni/paper.js