anchor.diff:  translate_space(#gri{aspect = eff_groups, scope = private}, Groups) ->
       #{
           <<"list">> => lists:map(fun(GroupId) ->
  -            gs_protocol:gri_to_string(#gri{
  +            gri:serialize(#gri{
                   type = op_group,
                   id = GroupId,
                   aspect = instance,
  
positive.code: 
          #{
              <<"name">> => Name,
              <<"owner">> => gs_protocol:gri_to_string(#gri{
                  type = op_user,
                  id = Owner,
                  aspect = instance,
  
negative.code:                 true -> <<"acl">>;
                  false -> <<"posix">>
              end,
              <<"acl">> => gri:serialize(#gri{
                  type = op_file,
                  id = Guid,
                  aspect = acl,
  