[wfunction]

It's just a smart-aleck comment pointing out that there is a "bias" because we're using a finite number of points and we get the same exact answer every time -- and since that answer isn't exactly equal to pi, the procedure is "biased".

Which no one cares about because (1) this isn't a probabilistic process in the first place, so "bias" itself is meaningless, and (2) there is now an exact bound on the error, unlike the previous case (I guess you can think of this as the "variance" if you want).