Unused value of "mu"

[catherio]

glicko2/glicko2.py

Line 151 in 4a3078e

mu = rating.mu + Q / denom * (difference / variance_inv)

The value of "mu" at this line appears to be unused. Is this an error, or is it intentional?

[drdarina]

Looking at the paper, it is an error. The mu computed later is correct.