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Ext.data.JsonP has no Context to the Request Object - missing 'Options'
Using Ext.Ajax.request, I got the options object submitted with the callback for post processing.
On Ext.data.JsonP this behavior is missing.
To patch this, I recommend to give the whole request object (which is available in the callback context) to the callback methods (success, failure, callback) as a second parameter.
Thank you for the report.