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