public function testXADiffWithKeyValueCallback()
{
$xao = new XArray(['ab' => 2, 'z' => 1]);
$obj = $xao->xadiff(['x' => 1, 'ab' => 22, 'z' => 3], 'length_compare_func', 'length_compare_func');
$this->assertEquals(['ab' => 22], (array) $obj);
}
