anchor.diff:  -type it_opt_resolver()     :: {resolver, metadata_resolver() | lww}.
   -type it_opt()              :: it_opt_resolver().
   -type it_opts()             :: [it_opt()].
  +-type fold_opts()           :: it_opts().
   -opaque iterator()          :: {riak_core_metadata_manager:metadata_iterator(), it_opts()}.
   
   %% Put Option Types
  
positive.code:         Existing -> maybe_resolve(PKey, Existing, ResolveMethod)
      end.
  
  %% @spec Fold over all keys and values stored under a given prefix/subprefix
  -spec fold(fun(({metadata_key(), [metadata_value()]}) -> any()), any(), metadata_prefix()) ->
                    any().
  fold(Fun, Acc0, FullPrefix) ->
      It = iterator(FullPrefix),
      fold_it(Fun, Acc0, It).
  
  fold_it(Fun, Acc, It) ->
  
negative.code: -export([get/2,
           get/3,
           fold/3,
           fold/4,
           iterator/1,
           iterator/2,
           itr_next/1,
  