CLASS qw net/minecraft/migration/MigrationHandlerBuilder
	METHOD a build ()Lqv;
	METHOD a upgradeStack (Lqu;Lfc;ILjava/lang/String;)Lfc;
		ARG 0 handler
		ARG 1 tag
		ARG 2 version
		ARG 3 tagKey
	METHOD a registerTagUpgraders (Lqv;)V
		ARG 0 handler
	METHOD b upgradeStackList (Lqu;Lfc;ILjava/lang/String;)Lfc;
		ARG 0 handler
		ARG 1 tag
		ARG 2 version
		ARG 3 tagKey