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treegrid serialization

When I serialize my grid i noticed the following:

grid.serialize();

<rows><row id='s_28404'open='1'> -- note that there is no space between the id and open attribute.It throws an error if I processed the xml from the server. I also noticed that the encoding is not included on xml element. It only displays:
<?xml version="1.0" ?> instead of <?xml version="1.0" encoding="utf-8" ?>