public Pair<JobCallback, Bundle> extractCallback(@Nullable Bundle data) {
    if (data == null) {
      Log.e(TAG, ERROR_NULL_CALLBACK);
      return null;
    }

    return extractWrappedBinderFromParcel(data);
  }
A magic number that indicates the following value is a Parcelable.
jobdispatcher/src/main/java/com/firebase/jobdispatcher/GooglePlayCallbackExtractor.java