Closed does mean resolved. One way or another. If it's not resolved, it's still open. If the ticket was improperly marked closed, that just means someone else has to create a new ticket for the unresolved issue.
I started closing issues unceremoniously with a maybelater tag.
If I won't be working on it, if no one is working on it, I won't leave the bug open.
Either someone shows up and decides to put up the legwork or it gets closed, even if it doesn't cross the threshold of wontfix (i.e. I won't accept a fix).