As far as I see the new feature in
story #8317 introduces a new boolean parameter in the "/trackers/{id}/artifacts" method for setting the order of artefacts, but this is inconsistent with how it is done in other parts of the REST API: "/projects/{id}/milestones" method and "/milestones/{id}/milestones" method. There a selection "asc/desc" is used.
For me it would make sense to have these kind of parameters used consistently in the complete REST API.