I need a better name for this module. I don't like Math::NearestNeighbour, partly because of the "neighbour"/"neighbor" spelling problem.
What it does is, given a set of points, work out the distance between the closest pair of points, in a more efficient way than just working out the distance between every pair of points. It can also tell you the distance from any one point to its nearest neighbour, unless that point is "insufficiently close" to any other points.
::ShortestDistance ?
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