Unable to assign decimal values to 'number' type attributes

Data model @ http://magnetodb.readthedocs.org/en/latest/user_guide.html
states about the 'Number' data type as "Numbers are positive or negative exact-value decimals and integers. "
But when we try to assign a decimal value to an attribute of 'Number' data type, the below exception is thrown:

<snip>
>>> c.put_item('trust', {'expected': {...}, 'item': {..., 'count': {'N': 4.0}, ...}})
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python2.7/dist-packages/magnetodbclient/v1/client.py", line 92, in put_item
    return self.post(self.put_item_path % table_name, request_body)
  File "/usr/local/lib/python2.7/dist-packages/magnetodbclient/v1/client_base.py", line 195, in post
    headers=headers, params=params)
  File "/usr/local/lib/python2.7/dist-packages/magnetodbclient/v1/client_base.py", line 123, in do_request
    resp, replybody = self.httpclient.do_request(action, method, body=body)
  File "/usr/local/lib/python2.7/dist-packages/magnetodbclient/client.py", line 259, in do_request
    **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/magnetodbclient/client.py", line 221, in _cs_request
    resp, body = self._time_request(url, method, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/magnetodbclient/client.py", line 207, in _time_request
    resp, body = self.request(url, method, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/magnetodbclient/client.py", line 201, in request
    raise exceptions.from_response(resp, body, url)
magnetodbclient.common.exceptions.BadRequest: Can't recognize attribute value '4.0'of type {"type": "N"}
>>>
</snip>

Works fine when we assign an integer though.
<snip2>
>>> c.put_item('trust', {'expected': {...}, 'item': {..., 'count': {'N': 4}, ...}})
{}
>>>
</snip2>