`pow(x,y[,z])`

[darrylabbate]

TODO: Flesh out this description

This was actually added a while back in 13d3ee5185c421bdd8e9e9e2731d04067cbdd40b but later reverted in 6e3e92aa32223786cd39a49d1a1687787cb7b7f8

Depends on:

• 48

Ref:

• https://en.wikipedia.org/wiki/Modular_multiplicative_inverse