autoexpunge creates special_use folder

[Tom Sommer]

namespace inbox {
  mailbox Spam {
    special_use = \Spam
    auto = create
    autoexpunge = 30d
  }
}
This creates the "Spam" folder in the filesystem on login/logout, even 
though it shouldn't.
If I remove autoexpunge, the folder is not created.

--
Tom Sommer