Description:
------------
Now we have no ways to controll type casting of Countable-objects to boolean 
type. We would like to work with the SPL-derivatives, as well as with the built-
in types.

Test script:
---------------
<?php
class myCountable implements Countable
{
  function count()
  {
    return 0;
  }
}

var_dump((boolean) array());
var_dump((boolean) new myCountable());


Expected result:
----------------
bool(false)
bool(false)


Actual result:
--------------
bool(false)
bool(true)