Description:
------------
If an array is used as a class property and the keys are constants, where two keys / constants have the same value, the second key is converted to a "strange" string.

Reproduce code:
---------------
<?php

class Constants {
    // Needs to be equal
    const A = 1;
    const B = 1;
}

class ArrayProperty {
    public static $array = array(
        Constants::A => 23,
        Constants::B => 42,
    );
}

var_dump( ArrayProperty::$array );

?>

Expected result:
----------------
Output PHP 5.2.7-dev (cli) (built: Aug  7 2008 11:12:42) (DEBUG)
array(1) {
  [1]=>
  int(42)
}

Actual result:
--------------
Output PHP 5.3.0alpha2-dev (cli) (built: Aug  6 2008 19:47:42) (DEBUG)
array(2) {
  [1]=>
  int(23)
  ["Constants::"]=>
  int(42)
}