backported fastutil implementation of the item list

src/api/java/appeng/api/storage/data/IAEItemStack.java

@@ -112,4 +112,13 @@ public interface IAEItemStack extends IAEStack<IAEItemStack>
 	 * @return definition stack
 	 */
 	ItemStack getDefinition();
+
+	/**
+	 * Compare this AE item stack to another item stack, but ignores
+	 * the amount. It checks the item type, NBT and damage values.
+	 *
+	 * @param is An item stack
+	 */
+	boolean equals(ItemStack is);
+
 }