Platform Comparison

// CommandSender IS Audience - direct cast, zero overhead
public class PaperAudienceConverter implements AudienceConverter<CommandSender> {
    @Override
    public Audience convert(CommandSender viewer) {
        return viewer; // Direct!
    }
}

// Locale from player.locale()
public class PaperLocaleProvider implements LocaleProvider<CommandSender> {
    @Override
    public Locale provide(CommandSender viewer) {
        return viewer instanceof Player p ? p.locale() : Locale.ROOT;
    }
}