Glicko.Player.to_v2

You're seeing just the function to_v2, go back to Glicko.Player module for more information.
Link to this function

to_v2(player, volatility \\ initial_volatility())

Specs

to_v2(player :: t(), volatility :: volatility()) :: v2()

Converts a v1 player to a v2.

A v2 player will pass-through unchanged with the volatility arg ignored.