fa and fo seems to always evaluate to 1.0

[ChristerNilsson]

const fa = a.f || 1.0;
const fo = b.f || 1.0;

const result = Math.pow(2, -n)*Math.pow((1+fa)/(1+fo), 1/2);

[ChristerNilsson]

Reduces to:

const result = Math.pow(2, -n);