[VA] SRC#006- Pi Day 2020 Special: A New Fast Way to Compute Pi

[ttw]

One problem with fast generation of the digits of Pi (or whatever) is that almost all the time is taken in the last step. Going through a quadratically convergent method to a quartically versions doesn't gain as much as one wants. The last step still uses full length arithmetic go get the whole digit string. (Assuming that one uses short approximations in the early stages as suggested above.)