Full Disclosure: string length field overwrite in IE9?

["pm whatever" <pmwhatever () gmx net>]

To leak memory information, one way is to overwrite the length field of a string (as explained here: 
http://www.vupen.com/blog/20120710.Advanced_Exploitation_of_Internet_Explorer_HeapOv_CVE-2012-1876.php).

This works well under IE8, but does anyone know how one can create such a string allocation under IE9? Known methods to 
allocate such strings don't seem to work under IE9. What javascript code is needed to allocate a few bstr strings of 
size 0x200 in IE9, for example?

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