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If using this parameter changes the result it means that a different method should be used. Using it does not solve the real problem, it only hides it. Consider a polygon in another, touching at the first vertex. Checking the midpoint of the first segment of contained polygon could result in finding out that the polygon is inside. However if the segment was collinear to the containing polygon's segment or this polygon had vertex exactly at the checked midpoint the result would be the same as using the first point of the contained polygon.