diff --git a/Foundation/CPCountedSet.j b/Foundation/CPCountedSet.j
index ccad1365f..a99b94a98 100644
--- a/Foundation/CPCountedSet.j
+++ b/Foundation/CPCountedSet.j
@@ -40,12 +40,12 @@
     
     [super addObject:anObject];
     
-    var hash = [anObject hash];
+    var UID = [anObject UID];
     
-    if (_counts[hash] === undefined)
-        _counts[hash] = 1;
+    if (_counts[UID] === undefined)
+        _counts[UID] = 1;
     else
-        ++_counts[hash];
+        ++_counts[UID];
 }
 
 - (void)removeObject:(id)anObject
@@ -53,18 +53,18 @@
     if (!_counts)
         return;
         
-    var hash = [anObject hash];
+    var UID = [anObject UID];
     
-    if (_counts[hash] === undefined)
+    if (_counts[UID] === undefined)
         return;
     
     else
     {
-        --_counts[hash];
+        --_counts[UID];
         
-        if (_counts[hash] === 0)
+        if (_counts[UID] === 0)
         {
-            delete _counts[hash];
+            delete _counts[UID];
             [super removeObject:anObject];
         }
     }
@@ -85,12 +85,12 @@
     if (!_counts)
         _counts = {};
     
-    var hash = [anObject hash];
+    var UID = [anObject UID];
     
-    if (_counts[hash] === undefined)
+    if (_counts[UID] === undefined)
         return 0;
     
-    return _counts[hash];
+    return _counts[UID];
 }
 
 
diff --git a/Foundation/CPJSONPConnection.j b/Foundation/CPJSONPConnection.j
index 7076697f3..f721291f7 100644
--- a/Foundation/CPJSONPConnection.j
+++ b/Foundation/CPJSONPConnection.j
@@ -86,7 +86,7 @@ CPJSONPCallbackReplacementString = @"${JSONP_CALLBACK}";
 {
     try
     {
-        CPJSONPConnectionCallbacks["callback"+[self hash]] = function(data)
+        CPJSONPConnectionCallbacks["callback"+[self UID]] = function(data)
         {
             [_delegate connection:self didReceiveData:data];
             [self removeScriptTag];
@@ -100,11 +100,11 @@ CPJSONPCallbackReplacementString = @"${JSONP_CALLBACK}";
         if (_callbackParameter)
         {
             source += (source.indexOf('?') < 0) ? "?" : "&";
-            source += _callbackParameter+"=CPJSONPConnectionCallbacks.callback"+[self hash];
+            source += _callbackParameter+"=CPJSONPConnectionCallbacks.callback"+[self UID];
         }
         else if (source.indexOf(CPJSONPCallbackReplacementString) >= 0)
         {
-            source = [source stringByReplacingOccurrencesOfString:CPJSONPCallbackReplacementString withString:"CPJSONPConnectionCallbacks.callback"+[self hash]];
+            source = [source stringByReplacingOccurrencesOfString:CPJSONPCallbackReplacementString withString:"CPJSONPConnectionCallbacks.callback"+[self UID]];
         }
         else
             return;
@@ -130,8 +130,8 @@ CPJSONPCallbackReplacementString = @"${JSONP_CALLBACK}";
     if(_scriptTag && _scriptTag.parentNode == head)
         head.removeChild(_scriptTag);
 
-    CPJSONPConnectionCallbacks["callback"+[self hash]] = nil;
-    delete CPJSONPConnectionCallbacks["callback"+[self hash]];
+    CPJSONPConnectionCallbacks["callback"+[self UID]] = nil;
+    delete CPJSONPConnectionCallbacks["callback"+[self UID]];
 }
 
 - (void)cancel
diff --git a/Foundation/CPKeyValueCoding.j b/Foundation/CPKeyValueCoding.j
index cc661e80e..59720316a 100644
--- a/Foundation/CPKeyValueCoding.j
+++ b/Foundation/CPKeyValueCoding.j
@@ -45,9 +45,9 @@ CPUnknownUserInfoKey        = @"CPUnknownUserInfoKey";
     if (!CPObjectAccessorsForClass)
         CPObjectAccessorsForClass = [CPDictionary dictionary];
     
-    var hash = [isa hash],
+    var UID = [isa UID],
         selector = nil,
-        accessors = [CPObjectAccessorsForClass objectForKey:hash];
+        accessors = [CPObjectAccessorsForClass objectForKey:UID];
     
     if (accessors)
     {
@@ -60,7 +60,7 @@ CPUnknownUserInfoKey        = @"CPUnknownUserInfoKey";
     {
         accessors = [CPDictionary dictionary];
         
-        [CPObjectAccessorsForClass setObject:accessors forKey:hash];
+        [CPObjectAccessorsForClass setObject:accessors forKey:UID];
     }
 
     var capitalizedKey = aKey.charAt(0).toUpperCase() + aKey.substr(1);
@@ -88,9 +88,9 @@ CPUnknownUserInfoKey        = @"CPUnknownUserInfoKey";
     if (!CPObjectModifiersForClass)
         CPObjectModifiersForClass = [CPDictionary dictionary];
     
-    var hash = [isa hash],
+    var UID = [isa UID],
         selector = nil,
-        modifiers = [CPObjectModifiersForClass objectForKey:hash];
+        modifiers = [CPObjectModifiersForClass objectForKey:UID];
     
     if (modifiers)
     {
@@ -103,7 +103,7 @@ CPUnknownUserInfoKey        = @"CPUnknownUserInfoKey";
     {
         modifiers = [CPDictionary dictionary];
         
-        [CPObjectModifiersForClass setObject:modifiers forKey:hash];
+        [CPObjectModifiersForClass setObject:modifiers forKey:UID];
     }
     
     if (selector)
diff --git a/Foundation/CPKeyValueObserving.j b/Foundation/CPKeyValueObserving.j
index 107b80810..189bf803a 100644
--- a/Foundation/CPKeyValueObserving.j
+++ b/Foundation/CPKeyValueObserving.j
@@ -58,7 +58,7 @@
     if (!anObserver || !aPath)
         return;
 
-    [[KVOProxyMap objectForKey:[self hash]] _removeObserver:anObserver forKeyPath:aPath];
+    [[KVOProxyMap objectForKey:[self UID]] _removeObserver:anObserver forKeyPath:aPath];
 }
 
 + (BOOL)automaticallyNotifiesObserversForKey:(CPString)aKey
@@ -119,7 +119,7 @@ var KVOProxyMap = [CPDictionary dictionary],
 
 + (id)proxyForObject:(CPObject)anObject
 {
-    var proxy = [KVOProxyMap objectForKey:[anObject hash]];
+    var proxy = [KVOProxyMap objectForKey:[anObject UID]];
 
     if (proxy)
         return proxy;
@@ -128,7 +128,7 @@ var KVOProxyMap = [CPDictionary dictionary],
 
     [proxy _replaceClass];
 
-    [KVOProxyMap setObject:proxy forKey:[anObject hash]];
+    [KVOProxyMap setObject:proxy forKey:[anObject UID]];
 
     return proxy;
 }
@@ -215,12 +215,12 @@ var KVOProxyMap = [CPDictionary dictionary],
     if (!composedOfKeys)
         return;
 
-    var dependentKeysForClass = [DependentKeysMap objectForKey:[_nativeClass hash]];
+    var dependentKeysForClass = [DependentKeysMap objectForKey:[_nativeClass UID]];
 
     if (!dependentKeysForClass)
     {
         dependentKeysForClass = [CPDictionary new];
-        [DependentKeysMap setObject:dependentKeysForClass forKey:[_nativeClass hash]];
+        [DependentKeysMap setObject:dependentKeysForClass forKey:[_nativeClass UID]];
     }
 
     for (var i=0, count=composedOfKeys.length; i<count; i++)
@@ -259,7 +259,7 @@ var KVOProxyMap = [CPDictionary dictionary],
         [_observersForKey setObject:observers forKey:aPath];
     }
 
-    [observers setObject:_CPKVOInfoMake(anObserver, options, aContext, forwarder) forKey:[anObserver hash]];
+    [observers setObject:_CPKVOInfoMake(anObserver, options, aContext, forwarder) forKey:[anObserver UID]];
     
     if (options & CPKeyValueObservingOptionInitial)
     {
@@ -279,11 +279,11 @@ var KVOProxyMap = [CPDictionary dictionary],
 
     if (aPath.indexOf('.') != CPNotFound)
     {
-        var forwarder = [observers objectForKey:[anObserver hash]].forwarder;
+        var forwarder = [observers objectForKey:[anObserver UID]].forwarder;
         [forwarder finalize];
     }
 
-    [observers removeObjectForKey:[anObserver hash]];
+    [observers removeObjectForKey:[anObserver UID]];
 
     if (![observers count])
         [_observersForKey removeObjectForKey:aPath];
@@ -291,7 +291,7 @@ var KVOProxyMap = [CPDictionary dictionary],
     if (![_observersForKey count])
     {
         _targetObject.isa = _nativeClass; //restore the original class
-        [KVOProxyMap removeObjectForKey:[_targetObject hash]];
+        [KVOProxyMap removeObjectForKey:[_targetObject UID]];
     }
 }
 
@@ -375,7 +375,7 @@ var KVOProxyMap = [CPDictionary dictionary],
             [observerInfo.observer observeValueForKeyPath:aKey ofObject:_targetObject change:changes context:observerInfo.context];
     }
     
-    var keysComposedOfKey = [[[DependentKeysMap objectForKey:[_nativeClass hash]] objectForKey:aKey] allObjects];
+    var keysComposedOfKey = [[[DependentKeysMap objectForKey:[_nativeClass UID]] objectForKey:aKey] allObjects];
     
     if (!keysComposedOfKey)
         return;
@@ -428,7 +428,7 @@ var KVOProxyMap = [CPDictionary dictionary],
 
 - (Class)class
 {
-    return [KVOProxyMap objectForKey:[self hash]]._nativeClass;
+    return [KVOProxyMap objectForKey:[self UID]]._nativeClass;
 }
 
 - (Class)superclass
diff --git a/Foundation/CPKeyedArchiver.j b/Foundation/CPKeyedArchiver.j
index aebaf4adb..05f9f601b 100644
--- a/Foundation/CPKeyedArchiver.j
+++ b/Foundation/CPKeyedArchiver.j
@@ -208,7 +208,7 @@ var _CPKeyedArchiverStringClass                         = Nil,
         // Do whatever with the class, yo.
         // We call willEncodeObject previously.
         
-        _plistObject = _plistObjects[[_UIDs objectForKey:[object hash]]];
+        _plistObject = _plistObjects[[_UIDs objectForKey:[object UID]]];
         [object encodeWithCoder:self];
 
         if (_delegate && _delegateSelectors & _CPKeyedArchiverDidEncodeObjectSelector)
@@ -480,8 +480,8 @@ var _CPKeyedArchiverEncodeObject = function(self, anObject, isConditional)
         anObject = [_CPKeyedArchiverValue valueWithJSObject:anObject];
     
     // Get the proper replacement object
-    var hash = [anObject hash],
-        object = [self._replacementObjects objectForKey:hash];
+    var GUID = [anObject UID],
+        object = [self._replacementObjects objectForKey:GUID];
 
     // If a replacement object doesn't exist, then actually ask for one.
     // Explicitly compare to nil because object could be === 0.
@@ -506,7 +506,7 @@ var _CPKeyedArchiverEncodeObject = function(self, anObject, isConditional)
             }
         }
         
-        [self._replacementObjects setObject:object forKey:hash];
+        [self._replacementObjects setObject:object forKey:GUID];
     }
     
     // If we still don't have an object by this point, then return a 
@@ -516,7 +516,7 @@ var _CPKeyedArchiverEncodeObject = function(self, anObject, isConditional)
         return _CPKeyedArchiverNullReference;
     
     // If not, then grab the object's UID
-    var UID = [self._UIDs objectForKey:hash = [object hash]];
+    var UID = [self._UIDs objectForKey:GUID = [object UID]];
     
     // If this object doesn't have a unique index in the object table yet, 
     // then it also hasn't been properly encoded.  We explicitly compare 
@@ -527,10 +527,10 @@ var _CPKeyedArchiverEncodeObject = function(self, anObject, isConditional)
         if (isConditional)
         {
             // If we haven't already noted this conditional object...
-            if ((UID = [self._conditionalUIDs objectForKey:hash]) === nil)
+            if ((UID = [self._conditionalUIDs objectForKey:GUID]) === nil)
             {
                 // Use the null object as a placeholder.
-                [self._conditionalUIDs setObject:UID = [self._plistObjects count] forKey:hash];
+                [self._conditionalUIDs setObject:UID = [self._plistObjects count] forKey:GUID];
                 [self._plistObjects addObject:_CPKeyedArchiverNullString];
             }
         }
@@ -582,17 +582,17 @@ var _CPKeyedArchiverEncodeObject = function(self, anObject, isConditional)
                 [plistObject setObject:[CPDictionary dictionaryWithObject:classUID forKey:_CPKeyedArchiverUIDKey] forKey:_CPKeyedArchiverClassKey];
             }
             
-            UID = [self._conditionalUIDs objectForKey:hash];
+            UID = [self._conditionalUIDs objectForKey:GUID];
             
             // If this object WAS previously encoded conditionally...
             if (UID !== nil)
             {
-                [self._UIDs setObject:UID forKey:hash];
+                [self._UIDs setObject:UID forKey:GUID];
                 [self._plistObjects replaceObjectAtIndex:UID withObject:plistObject];
             }
             else
             {
-                [self._UIDs setObject:UID = [self._plistObjects count] forKey:hash];
+                [self._UIDs setObject:UID = [self._plistObjects count] forKey:GUID];
                 [self._plistObjects addObject:plistObject];
             }
         }
diff --git a/Foundation/CPNotificationCenter.j b/Foundation/CPNotificationCenter.j
index 76d793271..564c6ea66 100644
--- a/Foundation/CPNotificationCenter.j
+++ b/Foundation/CPNotificationCenter.j
@@ -201,12 +201,12 @@ var _CPNotificationCenterPostNotification = function(/* CPNotificationCenter */
         anObject = [CPNull null];
     
     // Grab all the listeners for this notification/object pair
-    var observers = [_objectObservers objectForKey:[anObject hash]];
+    var observers = [_objectObservers objectForKey:[anObject UID]];
 
     if (!observers)
     {
         observers = [];
-        [_objectObservers setObject:observers forKey:[anObject hash]];
+        [_objectObservers setObject:observers forKey:[anObject UID]];
     }
     
     if (observers == _postingObservers)
@@ -248,7 +248,7 @@ var _CPNotificationCenterPostNotification = function(/* CPNotificationCenter */
     }
     else
     {
-        var key = [anObject hash],
+        var key = [anObject UID],
             observers = [_objectObservers objectForKey:key];
             count = observers ? observers.length : 0;
         
@@ -284,7 +284,7 @@ var _CPNotificationCenterPostNotification = function(/* CPNotificationCenter */
     // rigorous testing in those cases.
     var object = [aNotification object];
     
-    if (object != nil && (_postingObservers = [_objectObservers objectForKey:[object hash]]))
+    if (object != nil && (_postingObservers = [_objectObservers objectForKey:[object UID]]))
     {
         var observers = _postingObservers,
             count = observers.length;
@@ -303,7 +303,7 @@ var _CPNotificationCenterPostNotification = function(/* CPNotificationCenter */
     }
     
     // Now do the same for the nil object observers...
-    _postingObservers = [_objectObservers objectForKey:[[CPNull null] hash]];
+    _postingObservers = [_objectObservers objectForKey:[[CPNull null] UID]];
     
     if (!_postingObservers)
         return;
diff --git a/Foundation/CPObject.j b/Foundation/CPObject.j
index 0cb462fbe..95337ba3d 100644
--- a/Foundation/CPObject.j
+++ b/Foundation/CPObject.j
@@ -269,7 +269,7 @@ CPLog(@"Got some class: %@", inst);</pre>
 */
 - (CPString)description
 {
-    return "<" + isa.name + " 0x" + [CPString stringWithHash:[self hash]] + ">";
+    return "<" + isa.name + " 0x" + [CPString stringWithHash:[self UID]] + ">";
 }
 
 // Sending Messages
@@ -357,7 +357,7 @@ CPLog(@"Got some class: %@", inst);</pre>
 {
     [CPException raise:CPInvalidArgumentException reason:
         (class_isMetaClass(isa) ? "+" : "-") + " [" + [self className] + " " + aSelector + "] unrecognized selector sent to " +
-        (class_isMetaClass(isa) ? "class" : "instance") + " 0x" + [CPString stringWithHash:[self hash]]];
+        (class_isMetaClass(isa) ? "class" : "instance") + " 0x" + [CPString stringWithHash:[self UID]]];
 }
 
 // Archiving
@@ -482,7 +482,7 @@ CPLog(@"Got some class: %@", inst);</pre>
 */
 - (BOOL)isEqual:(id)anObject
 {
-    return self === anObject || [self hash] === [anObject hash];
+    return self === anObject || [self UID] === [anObject UID];
 }
 
 /*!
diff --git a/Foundation/CPSet.j b/Foundation/CPSet.j
index 824b925dc..02cbeaef5 100644
--- a/Foundation/CPSet.j
+++ b/Foundation/CPSet.j
@@ -232,7 +232,7 @@
 */
 - (BOOL)containsObject:(id)anObject
 {
-    if (_contents[[anObject hash]] && [_contents[[anObject hash]] isEqual:anObject])
+    if (_contents[[anObject UID]] && [_contents[[anObject UID]] isEqual:anObject])
         return YES;
     
     return NO;
@@ -372,7 +372,7 @@
 */
 - (void)addObject:(id)anObject
 {
-    _contents[[anObject hash]] = anObject;
+    _contents[[anObject UID]] = anObject;
     _count++;
 }
 
@@ -396,7 +396,7 @@
 {
     if ([self containsObject:anObject])
     {
-        delete _contents[[anObject hash]];
+        delete _contents[[anObject UID]];
         _count--;
     }
 }