CLASS bxx net/minecraft/world/chunk/UpgradeData
	CLASS bxx$b
		FIELD a BLACKLIST Lbxx$b;
		FIELD b DEFAULT Lbxx$b;
		FIELD c CHEST Lbxx$b;
		FIELD d LEAVES Lbxx$b;
		FIELD e STEM_BLOCK Lbxx$b;
	FIELD a NO_UPGRADE_DATA Lbxx;
	FIELD b LOGGER Lorg/apache/logging/log4j/Logger;
	FIELD d sides Ljava/util/EnumSet;
	FIELD e indices [[I
	METHOD <init> (Lic;)V
		ARG 1 tag
	METHOD b toTag ()Lic;