Description:
------------
5.2.6's unserialize() has a different behaviour than 5.2.5's.
In 5.2.6, unserialize() turns integer-based key in a stdClass into
an key of integer type. In 5.2.5, the key left an string type. 

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

class A {

  public function execute() {
    $a = new stdClass();
    $a->{self::B} = "c";
echo "Before:\n";
var_dump($a);

    $str = serialize($a);
    $a = unserialize($str);
echo "After:\n";
var_dump($a);

echo $a->{self::B} . "\n";

  }

  const B = "1";
}

$a = new A();
$a->execute();

?>


Expected result:
----------------
Before:
object(stdClass)#2 (1) {
  ["1"]=>
  string(1) "c"
}
After:
object(stdClass)#3 (1) {
  ["1"]=>
  string(1) "c"
}
c


Actual result:
--------------
Before:
object(stdClass)#2 (1) {
  ["1"]=>
  string(1) "c"
}
After:
object(stdClass)#3 (1) {
  [1]=>
  string(1) "c"
}

Notice: Undefined property: stdClass::$1 in /tmp/a.php on line 17

Call Stack:
    0.0010      50016   1. {main}() /tmp/a.php:0
    0.0386      50240   2. A->execute() /tmp/a.php:25