CLASS pg net/minecraft/migration/MigrationHandlerBuilder
	METHOD a build ()Lpf;
	METHOD a upgradeStack (Lpe;Ldt;ILjava/lang/String;)Ldt;
		ARG 0 handler
		ARG 1 tag
		ARG 2 version
		ARG 3 tagKey
	METHOD a registerTagUpgraders (Lpf;)V
		ARG 0 handler
	METHOD b upgradeStackList (Lpe;Ldt;ILjava/lang/String;)Ldt;
		ARG 0 handler
		ARG 1 tag
		ARG 2 version
		ARG 3 tagKey