Add a TODO note

lib/pleroma/web/activity_pub/activity_pub.ex

@@ -1157,6 +1157,8 @@ defp restrict_unlisted(query) do
     )
   end
 
+  # TODO: when all endpoints migrated to OpenAPI compare `pinned` with `true` (boolean) only,
+  # the same for `restrict_media/2`, `restrict_replies/2`, 'restrict_reblogs/2' and `restrict_muted/2`
   defp restrict_pinned(query, %{"pinned" => pinned, "pinned_activity_ids" => ids})
        when pinned in [true, "true", "1"] do
     from(activity in query, where: activity.id in ^ids)