fixup

js/js.libraries/src/core/collections/InternalMap.kt

diff --git a/js/js.libraries/src/core/collections/InternalMap.kt b/js/js.libraries/src/core/collections/InternalMap.kt
index b72f138..33e6b64 100644
--- a/js/js.libraries/src/core/collections/InternalMap.kt
+++ b/js/js.libraries/src/core/collections/InternalMap.kt
@@ -29,9 +29,9 @@
     fun remove(key: K): V?
     fun clear(): Unit
 
-    fun createJsMap() {
+    fun createJsMap(): dynamic {
         val result = js("Object.create(null)")
-        // V8 trick to force the map to be a HashMap
+        // force to switch object representation to dictionary mode
         result["foo"] = 1;
         deleteProperty(result, "foo")
         return result