mailboxes and capitalisation

[Thorsten Hater]

Dear all,

I have set up a series of special-use mailboxes in the default namespace
differing by capitalisation of the names, mainly to capture multiple
mailboxes
with autoexpunge

namespace inbox {
  ...
  mailbox Trash {
    auto        = no
    autoexpunge = 30d
    special_use = \Trash
  }
  mailbox trash {
    auto        = no
    autoexpunge = 30d
    special_use = \Trash
  }
  ...
}

However, doveconf -n reports only one mailbox, namely the second (lowercase
t)
and autoexpunge does not trigger for the first one (capital T). Removing
the special
use flag has no influence.

namespace inbox {
  inbox = yes
  list = children
  location =
  ...
  mailbox trash {
    auto = subscribe
    special_use = \Trash
  }
  ...
  prefix = INBOX.
  separator = .
  subscriptions = yes
  type = private
}

Is this the intended behaviour? The example 15-mailboxes.conf seems to
indicate
otherwise and I would prefer the ability to set autoexpunge for both Trash
and trash.
(dovecot 2.2.26 built from source on Debian 8.0)

Best regards,
  Thorsten