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URLQuery doesn't explicitly mention having a .toString() method returning a serialization of the internal name-value list. This must be mentioned in order for URLQuery to be usable for constructing a query string apart from a URL instance.
Note to self: even if we add this special casing in XMLHttpRequest is still useful to set the MIME type correctly. Though the special casing could maybe defer to stringifying rather than serializing the object...
https://github.com/whatwg/url/commit/fca4c46e1a18098af247cfe0b984b14d96dd6a0e
https://bugzilla.mozilla.org/show_bug.cgi?id=959684 for Gecko.