anchor.diff:      %% all is always valid
       case validate_permissions(Grants) of
           ok ->
  -            add_grant_int([all], Bucket, Grants);
  +            add_grant_int([{all, group}], Bucket, Grants);
           Error ->
               Error
       end;
  
positive.code:     #context{username=Username, grants=Grants, epoch=os:timestamp()}.
  
  accumulate_grants(Role, Type) ->
      {Grants, _Seen} = accumulate_grants([Role], [], [], Type),
      lists:flatten(Grants).
  
  accumulate_grants([], Seen, Acc, _Type) ->
  
negative.code:                     end
              catch
                  error:badarg ->
                      {error, {unknown_permission, Perm}}
              end;
          _ ->
              {error, {unknown_permission, Perm}}
  