public function testPrimaryKeyPersistAfterSave_Bug57()
{
$object = DomainObject::create(array('value' => 'llama'));
$this->assertEquals(1, $object->id);
$found = DomainObject::byId(1);
$found->value = 'alpaca';
$found->save();
$this->assertEquals(1, $found->id);
}