Translations:Draft Upgrade/10/en


 * Upgrades the given, which can be a single object or a list of objects.
 * If is, old objects are deleted.
 * If is given, it is the internal function to call to force a certain way of upgrading. It can be:, , , , , , , , , , , , or.
 * is returned, which is a list containing two lists: a list of new objects and a list of objects to be deleted.