/** Retrieves a player by their username. */
public Optional<Player> getPlayer(String username) {
return playerList.findFirst(player -> player.getUsername().equals(username));
}
/** Retrieves a player by their username hash. Faster than {@code getPlayer(String)}. */
public Optional<Player> getPlayer(long username) {
return playerList.findFirst(player -> player.getUsernameHash() == username);
}