code: @Nonnull
    public static StubObject createForUser (@Nullable final String sUserID,
                                            @Nullable final Map <String, String> aCustomAttrs)
    {
      return new StubObject (GlobalIDFactory.getNewPersistentStringID (), sUserID, aCustomAttrs);
    }
docs: Create a {@link StubObject} using the provided user ID and a new object ID
  
  @param sUserID
  User ID
  @param aCustomAttrs
  Custom attributes. May be <code>null</code>.
  @return Never <code>null</code>.