Get rid of ===/!===.

lib/html/src/Serialization.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 // Patch file for the dart:isolate library.
 
 /********************************************************
   Inserted from lib/isolate/serialization.dart
  ********************************************************/
 
@@ skipping 42 matching lines @@
   abstract visitMap(Map x);
   abstract visitSendPort(SendPort x);
   abstract visitSendPortSync(SendPortSync x);
 
   visitObject(Object x) {
     // TODO(floitsch): make this a real exception. (which one)?
     throw "Message serialization: Illegal value $x passed";
   }
 
   static bool isPrimitive(x) {
-    return (x === null) || (x is String) || (x is num) || (x is bool);
+    return (x == null) || (x is String) || (x is num) || (x is bool);
   }
 }
 
 
 /** A visitor that recursively copies a message. */
 class _Copier extends _MessageTraverser {
 
   visitPrimitive(x) => x;
 
   List visitList(List list) {
     List copy = _visited[list];
-    if (copy !== null) return copy;
+    if (copy != null) return copy;
 
     int len = list.length;
 
     // TODO(floitsch): we loose the generic type of the List.
     copy = new List(len);
     _visited[list] = copy;
     for (int i = 0; i < len; i++) {
       copy[i] = _dispatch(list[i]);
     }
     return copy;
   }
 
   Map visitMap(Map map) {
     Map copy = _visited[map];
-    if (copy !== null) return copy;
+    if (copy != null) return copy;
 
     // TODO(floitsch): we loose the generic type of the map.
     copy = new Map();
     _visited[map] = copy;
     map.forEach((key, val) {
       copy[_dispatch(key)] = _dispatch(val);
     });
     return copy;
   }
 
 }
 
 /** Visitor that serializes a message as a JSON array. */
 class _Serializer extends _MessageTraverser {
   int _nextFreeRefId = 0;
 
   visitPrimitive(x) => x;
 
   visitList(List list) {
     int copyId = _visited[list];
-    if (copyId !== null) return ['ref', copyId];
+    if (copyId != null) return ['ref', copyId];
 
     int id = _nextFreeRefId++;
     _visited[list] = id;
     var jsArray = _serializeList(list);
     // TODO(floitsch): we are losing the generic type.
     return ['list', id, jsArray];
   }
 
   visitMap(Map map) {
     int copyId = _visited[map];
-    if (copyId !== null) return ['ref', copyId];
+    if (copyId != null) return ['ref', copyId];
 
     int id = _nextFreeRefId++;
     _visited[map] = id;
     var keys = _serializeList(map.getKeys());
     var values = _serializeList(map.getValues());
     // TODO(floitsch): we are losing the generic type.
     return ['map', id, keys, values];
   }
 
   _serializeList(List list) {
     int len = list.length;
     var result = new List(len);
     for (int i = 0; i < len; i++) {
       result[i] = _dispatch(list[i]);
     }
     return result;
   }
 }
 
 /** Deserializes arrays created with [_Serializer]. */
 class _Deserializer {
   Map<int, Dynamic> _deserialized;
 
   _Deserializer();
 
   static bool isPrimitive(x) {
-    return (x === null) || (x is String) || (x is num) || (x is bool);
+    return (x == null) || (x is String) || (x is num) || (x is bool);
   }
 
   deserialize(x) {
     if (isPrimitive(x)) return x;
     // TODO(floitsch): this should be new HashMap<int, var|Dynamic>()
     _deserialized = new HashMap();
     return _deserializeHelper(x);
   }
 
   _deserializeHelper(x) {
     if (isPrimitive(x)) return x;
     assert(x is List);
     switch (x[0]) {
       case 'ref': return _deserializeRef(x);
       case 'list': return _deserializeList(x);
       case 'map': return _deserializeMap(x);
       case 'sendport': return deserializeSendPort(x);
       default: return deserializeObject(x);
     }
   }
 
   _deserializeRef(List x) {
     int id = x[1];
     var result = _deserialized[id];
-    assert(result !== null);
+    assert(result != null);
     return result;
   }
 
   List _deserializeList(List x) {
     int id = x[1];
     // We rely on the fact that Dart-lists are directly mapped to Js-arrays.
     List dartList = x[2];
     _deserialized[id] = dartList;
     int len = dartList.length;
     for (int i = 0; i < len; i++) {
@@ skipping 19 matching lines @@
   }
 
   abstract deserializeSendPort(List x);
 
   deserializeObject(List x) {
     // TODO(floitsch): Use real exception (which one?).
     throw "Unexpected serialized object";
   }
 }