title: How to use a variant dictionary (`a{sv}`) in dbus-send
body: <p>I have some trouble with <code>dbus-send</code> when using <code>a{sv}</code></p>
  
  <p>Calling a method with <code>in_signature='a{ss}'</code> seems to work using the 
  following command line:</p>
  
  <pre><code>dbus-send --dest="org.test.TestService" 
  /org/test/TestService/object org.test.TestService.method1 dict:string:string:"a","1","b","2"
  </code></pre>
  
  <p>Now I would like to have a dictionary with a variant type for values 
  (<code>in_signature=a{sv}</code>), </p>
  
  <p>How can I use it in <code>dbus-send</code>?</p>