public function testMergeAcceptsSpecialIds()
{
$item = array('id' => '0');
$result = $this->adapter->merge(array(), $item);
$this->assertTrue(isset($result['0']));
$item = array('id' => false);
$result = $this->adapter->merge(array(), $item);
$this->assertTrue(isset($result[false]));
$item = array('id' => 0);
$result = $this->adapter->merge(array(), $item);
$this->assertTrue(isset($result[0]));
$item = array('id' => 536);
$result = $this->adapter->merge(array(), $item);
$this->assertTrue(isset($result[536]));
$item = array('id' => '');
$result = $this->adapter->merge(array(), $item);
$this->assertTrue(isset($result['']));
}