CLASS btj net/minecraft/world/chunk/UpgradeData
	FIELD a NO_UPGRADE_DATA Lbtj;
	FIELD b LOGGER Lorg/apache/logging/log4j/Logger;
	FIELD d sides Ljava/util/EnumSet;
	FIELD e indices [[I
	METHOD <init> (Lhv;)V
		ARG 1 tag
	METHOD b toTag ()Lhv;