Return an ordered set of points if they are collinear (ports mapbox/delaunator/pull/47) #17
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This PR addresses the second issued tracked at #15 - returns ordered points on the hull with an empty triangulation (no triangles/edges) if input points are collinear.
This is contract breaking as
triangulate()now returnsTriangulationinstead ofOption<Triangulation>.When the set of input points is empty, the returned
Triangulationis empty (no triangles, edges or hull).