--- ../src-base/minecraft/net/minecraft/util/IntHashMap.java
+++ ../src-work/minecraft/net/minecraft/util/IntHashMap.java
@@ -10,7 +10,7 @@
     private int threshold = 12;
     private final float growFactor = 0.75F;
     private transient volatile int versionStamp;
-    private Set keySet = new HashSet();
+    // private Set keySet = new HashSet(); // CraftBukkit - expensive and unused
     private static final String __OBFID = "CL_00001490";
 
     private static int computeHash(int p_76044_0_)
@@ -61,7 +61,7 @@
 
     public void addKey(int p_76038_1_, Object p_76038_2_)
     {
-        this.keySet.add(Integer.valueOf(p_76038_1_));
+        //this.keySet.add(Integer.valueOf(p_76038_1_)); // CraftBukkit
         int j = computeHash(p_76038_1_);
         int k = getSlotIndex(j, this.slots.length);
 
@@ -125,7 +125,7 @@
 
     public Object removeObject(int p_76049_1_)
     {
-        this.keySet.remove(Integer.valueOf(p_76049_1_));
+        //this.keySet.remove(Integer.valueOf(p_76049_1_)); // CraftBukkit
         IntHashMap.Entry entry = this.removeEntry(p_76049_1_);
         return entry == null ? null : entry.valueEntry;
     }