IRI support in XHR, was: XHR LC comments

Julian Reschke wrote:
> That being said, I just tested IRIs with IE/FF/Opera/Safari, and they 
> work everywhere except in IE (both 7 and 8beta) (*). Thus, we don't have 
> any kind of interoperability here.

...so this should probably be covered by the test suite...

BR, Julian