At Ray's suggestion, go ahead and throw an error when the wrong type is read. Use the Type(obj) cast syntax (I was unaware that this would actually throw an error). Reading objects of a basic type like Array must still use "readObject(Array) as Array" so this is still supported, though not needed for user types.

git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@5441 542714f4-19e9-0310-aa3c-eee0fc999fb1

src/as/com/threerings/presents/net/AuthResponse.as

@@ -34,7 +34,7 @@ public class AuthResponse extends DownstreamMessage
     override public function readObject (ins :ObjectInputStream) :void
     {
         super.readObject(ins);
-        _data = (ins.readObject(AuthResponseData) as AuthResponseData);
+        _data = AuthResponseData(ins.readObject());
     }
 
     protected var _data :AuthResponseData;