WP update_option bug

gistfile1.php

<?php

function test1() {

	$a = new stdClass;
	$a->foo = false;

	$b = new stdClass;
	$b->foo = false;

	$array = array( $a, $b );

	update_option('_test', $array);
}

function test2() {

	$array = get_option('_test');
	$array[0]->foo = true;

	update_option('_test', $array);

	$array[1]->foo = true;
	update_option('_test', $array);
}

function test3() {

	$array = get_option('_test');

	if ( $array[0]->foo && $array[1]->foo ) {
		die("All ok!");
	} else {
		die("fail");
	}
}


// run test1(), test2() and test3() one at a time in three different page loads.