
PASS sending a plain empty object 
PASS sending the ES Math object 
PASS sending a new XHR instance 
PASS sending object that stringifies to undefined 
PASS sending object that stringifies to null 
PASS object that stringifies to query string 
PASS object that stringifies to JSON string 
PASS object whose valueOf() returns a document - ignore valueOf(), stringify 
PASS object whose toString() returns a document, expected to throw 
PASS object whose toString() throws, expected to throw