message: USe void 0 for undefined.
diff: @@ -802,7 +802,7 @@ function _createMessageConnection(messageReader: MessageReader, messageWriter: M
  }
  function undefinedToNull(param: any) {
  - if (param === undefined) {
  + if (param === void 0) {
  return null;
  } else {
  return param;
  