[jQuery] processData:false in ajax calls?

[jQuery] processData:false in ajax calls?

I'm a bit confused about processData parameter in the ajax call.
From the doc it talks about sending a dom node to the server, that sounds pretty strange. What is it used for?<br clear="all">
From the code it looks like a perfect hook to send non utf-8 data (iso-8859-1).
Has anyone used it???
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