Add equals(ItemStack) to IAEItemStack contract.

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

@@ -106,4 +106,13 @@ 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);
+
 }

src/main/java/appeng/util/item/AEItemStack.java

@@ -216,11 +216,16 @@ public final class AEItemStack extends AEStack<IAEItemStack> implements IAEItemS
         if (ia instanceof AEItemStack) {
             return this.isSameType((AEItemStack) ia);
         } else if (ia instanceof ItemStack) {
-            return this.isSameType((ItemStack) ia);
+            // this actually breaks the equals contract (being equals to unrelated classes)
+            return equals((ItemStack) ia);
         }
         return false;
     }
 
+    public boolean equals(final ItemStack is) {
+        return this.isSameType(is);
+    }
+
     @Override
     public String toString() {
         return this.getStackSize() + "x" + this.getDefinition().getItem().getRegistryName();