Why 3 more? Grandparent already counted one of the border points, so the correct number is either 1 more or 2 more, depending on whether you consider the floati

Why 3 more? Grandparent already counted one of the border points, so the correct number is either 1 more or 2 more, depending on whether you consider the floating point number -0 to be in the closed interval [0,1] or not. See my other posting for more details: https://news.ycombinator.com/item?id=13772578 https://news.ycombinator.com/item?id=13772578