unable to get milestone of a task via the API

Some recent changes (in malone) made it impossible to get the milestone of a task using launchpadlib. AFAICS, that the attribute is called "milestone_link" in the json representation, but it was renamed to "milestone" in the wadl definition file.
(as a side note: as of now https://edge.launchpad.net/+apidoc/#bug_task has still the old "milestone_link")

In [1]: b = launchpad.bugs[319641]

In [2]: t = b.bug_tasks[0]

In [3]: dir(t)
Out[3]:
[...
 'milestone',
 'owner',
 ...]

In [4]: t.milestone
---------------------------------------------------------------------------
AttributeError Traceback (most recent call last)

/media/disk-1/ipython/launchpad-shell/<ipython console> in <module>()

/media/disk-1/lp_api/launnchpadlib/trunk/launchpadlib/resource.pyc in __getattr__(self, name)
    455 if name in self._dirty_attributes:
    456 return self._dirty_attributes[name]
--> 457 return super(Entry, self).__getattr__(name)
    458
    459 def __setattr__(self, name, value):

/media/disk-1/lp_api/launnchpadlib/trunk/launchpadlib/resource.pyc in __getattr__(self, attr)
    300 except KeyError:
    301 raise AttributeError("'%s' object has no attribute '%s'"
--> 302 % (self.__class__.__name__, attr))
    303
    304 def _get_external_param_name(self, param_name):

AttributeError: 'Entry' object has no attribute 'milestone'

In [5]:

Markus