Glicko.Player.scale_rating_deviation_to

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

scale_rating_deviation_to(rating_deviation, version)

Specs

scale_rating_deviation_to(
  rating_deviation :: rating_deviation(),
  to_version :: version()
) ::
  rating_deviation()

Scales a player's rating deviation.