If the number of coordinates is odd, the behaviour is not defined.
x1, y1,
x2, y2, ...,
xN, yN)
giving vertices of an N-sided polygonisInside(0.5,0.5, 0,0, 0,1, 1,1, 1,0) = trueisInside(0,0, array(10,20, 20,20, 20,10)) = false