anchor.diff:    [] = barrel_local:changes_since(<<"testdb">>, 21, Fun, []),
     ok.
   
  -revdiff(_Config) ->
  -  Doc = #{ <<"id">> => <<"revdiff">>, <<"v">> => 1},
  -  {ok, <<"revdiff">>, RevId} = barrel_local:put(<<"testdb">>, Doc, []),
  +revsdiff(_Config) ->
  +  Doc = #{ <<"id">> => <<"revsdiff">>, <<"v">> => 1},
  +  {ok, <<"revsdiff">>, RevId} = barrel_local:put(<<"testdb">>, Doc, []),
     Doc2 = Doc#{<<"_rev">> => RevId, <<"v">> => 2},
  -  {ok, <<"revdiff">>, _RevId3} = barrel_local:put(<<"testdb">>, Doc2, []),
  -  {ok, [<<"1-missing">>], []} = barrel_local:revsdiff(<<"testdb">>, <<"revdiff">>, [<<"1-missing">>]),
  +  {ok, <<"revsdiff">>, _RevId3} = barrel_local:put(<<"testdb">>, Doc2, []),
  +  {ok, [<<"1-missing">>], []} = barrel_local:revsdiff(<<"testdb">>, <<"revsdiff">>, [<<"1-missing">>]),
     ok.
positive.code:     change_since,
      change_since_many,
      change_since_include_doc,
      revdiff,
      put_rev,
      change_deleted
    ].
  
negative.code:   change_since/1,
    change_since_many/1,
    change_since_include_doc/1,
    revsdiff/1,
    get_revisions/1,
    put_rev/1,
    change_deleted/1
  