Adding each potential translation vector twice.

[3bhady]

SVGnest/util/geometryutil.js

Lines 1567 to 1579 in 1248dc2

	vectors.push({
	x: vertexA.x-(vertexB.x+B.offsetx),
	y: vertexA.y-(vertexB.y+B.offsety),
	start: prevA,
	end: vertexA
	});
	vectors.push({
	x: prevA.x-(vertexB.x+B.offsetx),
	y: prevA.y-(vertexB.y+B.offsety),
	start: vertexA,
	end: prevA
	});

Is there a reason each vector is being added twice? The algorithm in the NFP paper specifies that we only need to add on of these translation vectors.
Could this be causing an overhead or is it needed for something else I'm not seeing?