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mediawiki.Uri does not support IPv6 URIs:

>>> var uri = new mw.Uri( 'http://127.0.0.1/' )
undefined
>>> var uri = new mw.Uri( 'http://[::1]/' )
Error: Bad constructor arguments

On a MediaWiki installation with IPv6 URL like
http://[::1]/w/index.php
the class mw.Uri gets not created because it is initialized with

mw.Uri = mw.UriRelative( document.location.href );