anchor.diff:             ]
            }
          ).
  +
   -define( SIMPLE_OBJECT2
          , { array
            , [ {"0", {struct, [{"type", "known"}]}}
  
positive.code:                                               ]
                                              ))
                ).
  fail_when_expected_contained_by_actual_and_unexpected_test() ->
    ?assertMatch( [{unexpected, {"/2", undefined, ?OBJECT_3}}]
                , filter_errors(compare_as_set( [ {"0", ?OBJECT_1}
  
negative.code:                                               ]
                                              ))
                ).
  
  pass_when_lists_reversed_and_unexpected_test() ->
    ?assertMatch( []
                , filter_errors(compare_as_set( [ {"0", ?OBJECT_1}
  