TrueWill

import * as scientist from 'tzientist';

// Gregory-Leibniz series to calculate Pi
// from https://stackoverflow.com/questions/39574989/calculating-pi-in-javascript-using-gregory-leibniz-series
function oldPi(): number {
  const n = 4000;

  let v = 0;
  for (let i = 1; i <= n; i += 4) {
    v += 1 / i - 1 / (i + 2);