@dispatch(Expr, object)
def pre_compute(leaf, data, scope=None, **kwargs):
    return data
Affiliations are always on the bare JID.
dataset/ETHPy150Open blaze/blaze/blaze/compute/core.py/pre_compute--crossover with--dataset/ETHPy150Open ralphm/wokkel/wokkel/test/test_pubsub.py/PubSubServiceTest.test_on_affiliationsSetBareJID