Riak (Python?) sibling question

gistfile1.py

import riak
import random

r = riak.RiakClient()

b = r.bucket("test")
# allow_mult
b.set_allow_multiples(True)

# new obj per run
key = "obj-%s" % random.randint(0, 1000000)

# brand new obj, ver 0
new_obj = b.new(key, data={'ver': 0})

# two new gets, they should share the same vclock
child1 = b.get(key)
child2 = b.get(key)
assert(child1.vclock() == child2.vclock())

child1.set_data({'ver': 1})
child1.store()

child2.set_data({'ver': 2})
child2.store()

# vlocks should now have diverged
assert(child1.vclock() != child2.vclock())

# a new request should have multiple siblings to deal with
new_request = b.get(key)
print "Siblings: ", new_request.get_sibling_count()
assert(new_request.get_sibling_count() == 2)

data = []
for sib in new_request.get_siblings():
    data.append(sib.get_data())
    print "Sibling data: ", sib.get_data()

# get_siblings should only return 2 values...
# FIXME: why does it return 3? why does one have a value of None?
assert(len(data) == 2)

# both versions should be represented somewhere in the returned siblings
# FIXME: why do both have a value of {'ver': 1}?
assert({'ver': 1} in data)
assert({'ver': 2} in data)