Magento debug and arrays

magentodebug.php

<?php
 
require_once('app/Mage.php');
Mage::app();

$model = Mage::getModel('catalog/product');
$model->setSomething(array('value' => null));
var_dump($model->debug());
var_dump($model->getData());

/*
//output:
array(1) {
  ["something"]=>
  array(0) {
  }
}
array(1) {
  ["something"]=>
  array(1) {
    ["value"]=>
    NULL
  }
}
*/