Currently this claim will fail:

>>> obj = urlparse.urlparse('http://a/b/c?')
>>> urlparse.urlunparse(obj)
'http://a/b/c'
>>> obj = urlparse.urlparse('http://a/b/c#')
>>> urlparse.urlunparse(obj)
'http://a/b/c'

If we move away from the current behavior, there will surely be some test failures that can be observed for urljoins. We will have to consider those cases too while fixing this.