anchor.diff:      prop_add_on_nr2(Key, true, Initial, ToAdd).
   
   tester_add_on_nr_maybe_invalid(_Config) ->
  -    tester:test(?MODULE, prop_add_on_nr_maybe_invalid, 3, 10000).
  +    tester:test(?MODULE, prop_add_on_nr_maybe_invalid, 3, 5000).
   
   -spec prop_test_and_set2(Key::client_key(), Existing::boolean(), RealOldValue::client_value(), OldValue::client_value(), NewValue::client_value()) -> true | no_return().
   prop_test_and_set2(Key, Existing, RealOldValue, OldValue, NewValue) ->
  
positive.code:     prop_add_del_on_list2(Key, OldValue, OldExists, ToAdd, ToRemove).
  
  tester_add_del_on_list_not_existing(_Config) ->
      tester:test(?MODULE, prop_add_del_on_list_not_existing, 3, 10000).
  
  -spec prop_add_del_on_list(Key::client_key(), Initial::client_value(), ToAdd::[client_value()], ToRemove::[client_value()]) -> true | no_return().
  prop_add_del_on_list(Key, Initial, ToAdd, ToRemove) ->
  
negative.code:     prop_add_on_nr2(Key, Existing, OldValue, ToAdd).
  
  tester_add_on_nr_not_existing(_Config) ->
      tester:test(?MODULE, prop_add_on_nr_not_existing, 2, 5000).
  
  -spec prop_add_on_nr(Key::client_key(), Initial::client_value(), ToAdd::number()) -> true | no_return().
  prop_add_on_nr(Key, Initial, ToAdd) ->
  