Small tweaks. Apply directly to the nipples.

git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@5727 542714f4-19e9-0310-aa3c-eee0fc999fb1

src/as/com/threerings/util/WeakValueHashMap.as

@@ -24,10 +24,10 @@ public class WeakValueHashMap extends HashMap
     override public function get (key :Object) :*
     {
         var result :* = super.get(key);
-        if (result is WeakReference) { // could also just be undefined
+        if (result is WeakReference) { // could also just be undefined or null
             result = WeakReference(result).get();
             if (result === undefined) {
-                remove(key);
+                super.remove(key);
             }
         }
         return result;
@@ -36,6 +36,7 @@ public class WeakValueHashMap extends HashMap
     /** @inheritDoc */
     override public function put (key :Object, value :Object) :*
     {
+        // store nulls directly
         return unwrap(super.put(key, (value == null) ? null : new WeakReference(value)));
     }