anchor.diff:    /**
      * Set whether uncaught errors will terminate the isolate.
      *
  -   * WARNING: This method is experimental and not handled on every platform yet.
  -   *
      * If errors are fatal, any uncaught error will terminate the isolate
      * event loop and shut down the isolate.
      *
  
positive.code:   /**
     * Resumes a paused isolate.
     *
     * WARNING: This method is experimental and not handled on every platform yet.
     *
     * Sends a message to an isolate requesting that it ends a pause
     * that was requested using the [resumeCapability].
     *
  
negative.code:   /**
     * Request that the isolate send [response] on the [responsePort].
     *
     * If the isolate is alive, it will eventually send `response`
     * (defaulting to `null`) on the response port.
     *
  