>>> import gitlab>>> gitlab.__version__'1.3.0'>>> gl = gitlab.Gitlab('https://dev.domain.tld', 'xxx')>>> p = gl.projects.get(30)>>> i = p.issues.get(9364)>>> i.save()>>> i.milestone = 1812>>> i.save()Traceback (most recent call last):  File "<stdin>", line 1, in <module>  File "/usr/lib/python2.7/dist-packages/gitlab/mixins.py", line 312, in save    server_data = self.manager.update(obj_id, updated_data, **kwargs)  File "/usr/lib/python2.7/dist-packages/gitlab/exceptions.py", line 253, in wrapped_f    raise error(e.error_message, e.response_code, e.response_body)gitlab.exceptions.GitlabUpdateError: 400: {"error":"title, description, assignee_ids, assignee_id, milestone_id, discussion_locked, labels, created_at, due_date, confidential, state_event are missing, at least one parameter must be provided"}

>>> m = p.milestones.get(1812)>>> m<ProjectMilestone id:1812>>>> i.milestone = m>>> i.save()Traceback (most recent call last):  File "<stdin>", line 1, in <module>  File "/usr/lib/python2.7/dist-packages/gitlab/mixins.py", line 312, in save    server_data = self.manager.update(obj_id, updated_data, **kwargs)  File "/usr/lib/python2.7/dist-packages/gitlab/exceptions.py", line 251, in wrapped_f    return f(*args, **kwargs)  File "/usr/lib/python2.7/dist-packages/gitlab/mixins.py", line 227, in update    return self.gitlab.http_put(path, post_data=data, **kwargs)  File "/usr/lib/python2.7/dist-packages/gitlab/__init__.py", line 827, in http_put    post_data=post_data, **kwargs)  File "/usr/lib/python2.7/dist-packages/gitlab/__init__.py", line 685, in http_request    prepped = self.session.prepare_request(req)  File "/usr/lib/python2.7/dist-packages/requests/sessions.py", line 407, in prepare_request    hooks=merge_hooks(request.hooks, self.hooks),  File "/usr/lib/python2.7/dist-packages/requests/models.py", line 305, in prepare    self.prepare_body(data, files, json)  File "/usr/lib/python2.7/dist-packages/requests/models.py", line 445, in prepare_body    body = complexjson.dumps(json)  File "/usr/lib/python2.7/json/__init__.py", line 244, in dumps    return _default_encoder.encode(obj)  File "/usr/lib/python2.7/json/encoder.py", line 207, in encode    chunks = self.iterencode(o, _one_shot=True)  File "/usr/lib/python2.7/json/encoder.py", line 270, in iterencode    return _iterencode(o, 0)  File "/usr/lib/python2.7/json/encoder.py", line 184, in default    raise TypeError(repr(o) + " is not JSON serializable")TypeError: <ProjectMilestone id:1812> is not JSON serializable