Make BaseBlock more memory efficient, and make it clear in the API that it's not intended to be used for every single block.

worldedit-core/src/main/java/com/sk89q/worldedit/world/registry/BlockMaterial.java

@@ -0,0 +1,154 @@
+/*
+ * WorldEdit, a Minecraft world manipulation toolkit
+ * Copyright (C) sk89q <http://www.sk89q.com>
+ * Copyright (C) WorldEdit team and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published by the
+ * Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.sk89q.worldedit.world.registry;
+
+/**
+ * Describes the material for a block.
+ */
+public interface BlockMaterial {
+
+    /**
+     * Get whether this block is a full sized cube.
+     *
+     * @return the value of the test
+     */
+    boolean isFullCube();
+
+    /**
+     * Get whether this block is opaque.
+     *
+     * @return the value of the test
+     */
+    boolean isOpaque();
+
+    /**
+     * Get whether this block emits a Redstone signal.
+     *
+     * @return the value of the test
+     */
+    boolean isPowerSource();
+
+    /**
+     * Get whether this block is a liquid.
+     *
+     * @return the value of the test
+     */
+    boolean isLiquid();
+
+    /**
+     * Get whether this block is a solid.
+     *
+     * @return the value of the test
+     */
+    boolean isSolid();
+
+    /**
+     * Get the hardness factor for this block.
+     *
+     * @return the hardness factor
+     */
+    float getHardness();
+
+    /**
+     * Get the resistance factor for this block.
+     *
+     * @return the resistance factor
+     */
+    float getResistance();
+
+    /**
+     * Get the slipperiness factor for this block.
+     *
+     * @return the slipperiness factor
+     */
+    float getSlipperiness();
+
+    /**
+     * Get the light value for this block.
+     *
+     * @return the light value
+     */
+    int getLightValue();
+
+    /**
+     * Get whether this block breaks when it is pushed by a piston.
+     *
+     * @return true if the block breaks
+     */
+    boolean isFragileWhenPushed();
+
+    /**
+     * Get whether this block can be pushed by a piston.
+     *
+     * @return true if the block cannot be pushed
+     */
+    boolean isUnpushable();
+
+    /**
+     * Get whether this block is ticked randomly.
+     *
+     * @return true if this block is ticked randomly
+     */
+    boolean isTicksRandomly();
+
+    /**
+     * Get whether this block prevents movement.
+     *
+     * @return true if this block blocks movement
+     */
+    boolean isMovementBlocker();
+
+    /**
+     * Get whether this block will burn.
+     *
+     * @return true if this block will burn
+     */
+    boolean isBurnable();
+
+    /**
+     * Get whether this block needs to be broken by a tool for maximum
+     * speed.
+     *
+     * @return true if a tool is required
+     */
+    boolean isToolRequired();
+
+    /**
+     * Get whether this block is replaced when a block is placed over it
+     * (for example, tall grass).
+     *
+     * @return true if the block is replaced
+     */
+    boolean isReplacedDuringPlacement();
+
+    /**
+     * Get whether this block is translucent.
+     *
+     * @return true if the block is translucent
+     */
+    boolean isTranslucent();
+
+    /**
+     * Gets whether the block has a container (Item container)
+     *
+     * @return If it has a container
+     */
+    boolean hasContainer();
+}

worldedit-core/src/main/java/com/sk89q/worldedit/world/registry/BlockRegistry.java

@@ -19,7 +19,6 @@
 
 package com.sk89q.worldedit.world.registry;
 
-import com.sk89q.worldedit.blocks.BlockMaterial;
 import com.sk89q.worldedit.registry.state.Property;
 import com.sk89q.worldedit.world.block.BlockType;
 

worldedit-core/src/main/java/com/sk89q/worldedit/world/registry/BundledBlockData.java

@@ -24,7 +24,6 @@ import com.google.gson.Gson;
 import com.google.gson.GsonBuilder;
 import com.google.gson.reflect.TypeToken;
 import com.sk89q.worldedit.Vector;
-import com.sk89q.worldedit.blocks.BlockMaterial;
 import com.sk89q.worldedit.util.gson.VectorAdapter;
 
 import java.io.IOException;

worldedit-core/src/main/java/com/sk89q/worldedit/world/registry/BundledBlockRegistry.java

@@ -19,7 +19,6 @@
 
 package com.sk89q.worldedit.world.registry;
 
-import com.sk89q.worldedit.blocks.BlockMaterial;
 import com.sk89q.worldedit.registry.state.Property;
 import com.sk89q.worldedit.world.block.BlockType;
 

worldedit-core/src/main/java/com/sk89q/worldedit/world/registry/PassthroughBlockMaterial.java

@@ -19,8 +19,6 @@
 
 package com.sk89q.worldedit.world.registry;
 
-import com.sk89q.worldedit.blocks.BlockMaterial;
-
 import javax.annotation.Nullable;
 
 public class PassthroughBlockMaterial implements BlockMaterial {

worldedit-core/src/main/java/com/sk89q/worldedit/world/registry/SimpleBlockMaterial.java

@@ -19,8 +19,6 @@
 
 package com.sk89q.worldedit.world.registry;
 
-import com.sk89q.worldedit.blocks.BlockMaterial;
-
 class SimpleBlockMaterial implements BlockMaterial {
 
     private boolean fullCube;