Wikimedia Bugzilla is closed!

mw.Uri.clone() copies each property individually, but it doesn't make a deep copy of the properties; almost all properties are simple types where it doesn't matter, but query is an object.

What's funny is that this breaks the example in the class documentation:

>>> var a = new mw.Uri('http://localhost/w/index.php?foo=bar')
>>> var b = a.clone()
>>> a.extend({'baz':'quux'})
>>> a.toString()
"http://localhost/w/index.php?foo=bar&baz=quux"
>>> b.toString()
"http://localhost/w/index.php?foo=bar&baz=quux"