Allow Object when doing lookups.

sdk/lib/collection/linked_hash_map.dart

 // Copyright (c) 2013, 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.
 
 part of dart.collection;
 
 /**
  * A hash-based map that iterates keys and values in key insertion order.
  */
 class LinkedHashMap<K, V> implements Map<K, V> {
   external LinkedHashMap();
 
   factory LinkedHashMap.from(Map<K, V> other) {
     return new LinkedHashMap<K, V>()..addAll(other);
   }
 
-  external bool containsKey(K key);
+  external bool containsKey(Object key);
 
-  external bool containsValue(V value);
+  external bool containsValue(Object value);
 
   external void addAll(Map<K, V> other);
 
-  external V operator [](K key);
+  external V operator [](Object key);
 
   external void operator []=(K key, V value);
 
   external V putIfAbsent(K key, V ifAbsent());
 
   external V remove(K key);

[Lasse Reichstein Nielsen, 2013/04/30 07:42:27]

remove too.

[floitsch, 2013/06/17 18:25:34]

Done.

 
   external void clear();
 
   external void forEach(void action (K key, V value));
 
   external Iterable<K> get keys;
   external Iterable<V> get values;
 
   external int get length;
 
   external bool get isEmpty;
 
   String toString() => Maps.mapToString(this);
 }