CLASS none/pg net/minecraft/migration/MigrationHandlerBuilder
	METHOD a build ()Lnone/pf;
	METHOD a upgradeStack (Lnone/pe;Lnone/dt;ILjava/lang/String;)Lnone/dt;
		ARG 0 handler
		ARG 1 tag
		ARG 2 version
		ARG 3 tagKey
	METHOD a registerTagUpgraders (Lnone/pf;)V
		ARG 0 handler
	METHOD b upgradeStackList (Lnone/pe;Lnone/dt;ILjava/lang/String;)Lnone/dt;
		ARG 0 handler
		ARG 1 tag
		ARG 2 version
		ARG 3 tagKey