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Someone who goes by user FrenchToast on freenode pointed out a problem he was having using Backbone and the request data being modified before it was posted. He didn't have time to post here so I offered to forward it along.
Here's a jsfiddle demoing what he encountered. The conditional in the json and jsonp prefilter allows for a json request to be interpreted as a jsonp and thus the body is modified as shown in the comments.
Simply adding { jsonp: false } to Backbone's default ajax params is enough to fix the issue, but is this expected behavior in jQuery? I looked over the ajax and specifically jsonp related tests and only found tests exercising this feature on requests where the dataType was "jsonp".
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