Redmine

Currently, in Redmine, when I mark a ticket as a duplicate, it doesn't get closed. This is confusing to me (and others on the forum), since I'm familiar with the model used in other trackers where marking a ticket as a duplicate is a form of closing that ticket. It's annoying to have to mark a bug as a duplicate and then also remember to mark it as Rejected or Closed (and which one should it be?). (I've also read on the forums/tracker of how closing duplicates closes the duplicated ticket as well, but I don't believe I've encountered this myself.)

Am I misunderstanding how to use duplicate issues in Redmine? What's the right flow for marking and closing duplicates?

Thanks.