anchor.diff:  
   -spec active_owners(ring(), [node()]) -> preflist().
   active_owners(Ring, UpNodes) ->
  -    UpNodes1 = ordsets:from_list(UpNodes),
  +    UpNodes1 = UpNodes,
       Primaries = riak_core_ring:all_owners(Ring),
       {Up, _Pangs} = check_up(Primaries, UpNodes1, [], []),
       Up.
  
positive.code: 
  %% Return true if a node is up
  is_up(Node, UpNodes) ->
      ordsets:is_element(Node, UpNodes).
  
  -ifdef(TEST).
  
  
negative.code: %% primary/fallback
  -spec get_apl_ann(binary(), n_val(), ring(), [node()]) -> preflist2().
  get_apl_ann(DocIdx, N, Ring, UpNodes) ->
      UpNodes1 = UpNodes,
      Preflist = riak_core_ring:preflist(DocIdx, Ring),
  
      {Primaries, Fallbacks} = lists:split(N, Preflist),
  