IPackageset.getBySeries not available on 1.0/devel API

[Francis J. Lacoste]

>>> from launchpadlib.launchpad import Launchpad
>>> lp = Launchpad.login_with('testcase', 'production')
>>> natty = lp.distributions['ubuntu'].getSeries(name_or_version='natty')
>>> sets = lp.packagesets.getBySeries(distroseries=natty)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python2.7/dist-packages/lazr/restfulclient/resource.py", line 319, in __getattr__
    % (self.__class__.__name__, attr))
AttributeError: 'Collection' object has no attribute 'getBySeries'

Specifying version='beta', will work.

There is a problem either with the implementation or the use of the @operation_for_version("beta")
used on IPackageset