libvirt users - Jun 2012 - ruby-libvirt connection stays open

Hi,

I have a problem regarding the Ruby bindings of Libvirt. The sort 
summary is that the connection does not closed properly when I have 
retrieved a domain from it. The small sample code is the following (I 
use irb for easy reading of return values):

The working connection closing (when I do nothing with the connection):
1.9.3p125 :001 > require 'libvirt'
  => true
1.9.3p125 :002 > conn = Libvirt::open('qemu+ssh://localhost/system')
  => #<Libvirt::Connect:0x00000001a40c30>
1.9.3p125 :003 > conn.close
  => nil
1.9.3p125 :004 > conn.closed?
  => true

(Note: I know I should not use ssh for localhost, it's just a test, in 
general we use different remote hosts for this, so ssh is needed.)
In this case there is no connection left open.

But look at this code:
1.9.3p125 :001 > require 'libvirt'
  => true
1.9.3p125 :002 > conn = Libvirt::open('qemu+ssh://localhost/system')
  => #<Libvirt::Connect:0x00000001af3d80>
1.9.3p125 :003 > domain = conn.lookup_domain_by_name('gomboc18')
  => #<Libvirt::Domain:0x00000001adf0d8>
1.9.3p125 :004 > conn.close
  => nil
1.9.3p125 :005 > conn.closed?
  => true

And i run a ps auxww there are the relevant processes:
nightw    9241  0.2  0.3  88380 13256 pts/0    Sl+  11:39   0:00 irb 

nightw    9248  0.0  0.0  41188  2772 pts/0    S+   11:39   0:00 ssh 
localhost sh -c 'nc -q 2>&1 | grep "requires an argument"
>/dev/null;if
[ $? -eq 0 ] ; then   CMD="nc -q 0 -U 
/var/run/libvirt/libvirt-sock";else   CMD="nc -U 
/var/run/libvirt/libvirt-sock";fi;eval "$CMD";'
root      9249  0.0  0.0  85752  3696 ?        Ss   11:39   0:00 sshd: 
nightw [priv]
nightw    9402  0.0  0.0  85752  1692 ?        S    11:39   0:00 sshd: 
nightw at notty
nightw    9403  0.0  0.0   4272   584 ?        Ss   11:39   0:00 sh -c 
nc -q 2>&1 | grep "requires an argument" >/dev/null;if [ $?
-eq 0 ] ;
then   CMD="nc -q 0 -U /var/run/libvirt/libvirt-sock";else  
CMD="nc -U
/var/run/libvirt/libvirt-sock";fi;eval "$CMD";
nightw    9406  0.0  0.0  14136   472 ?        S    11:39   0:00 nc -q 0 
-U /var/run/libvirt/libvirt-sock

And they remain open until i close irb (or the original ruby application 
on the real development system)

Do you have any suggestions for solving this problem?

Thanks,
Pal