SubnetSplitter not subnetting correctly

[alanwill]

It appears SubnetSplitter isn't subnetting correctly, here's what I'm seeing:

In this scenario I'm requesting 3 /24s and 3/26s from a /22

>>> from netaddr import *
>>> splitter = SubnetSplitter('10.40.0.0/22')
>>> subnet_24s = splitter.extract_subnet(24, count=3)
>>> subnet_26s = splitter.extract_subnet(26, count=3)
>>> print subnet_24s
[IPNetwork('10.40.0.0/24'), IPNetwork('10.40.1.0/24'), IPNetwork('10.40.2.0/24')]
>>> print subnet_26s
[IPNetwork('10.40.2.0/26'), IPNetwork('10.40.2.64/26'), IPNetwork('10.40.2.128/26')]
>>> available = splitter.available_subnets()
>>> print available
[IPNetwork('10.40.2.128/25'), IPNetwork('10.40.3.0/24')]

It's allocating 10.40.2.0/26 even with 10.40.2.0/24 already allocated.

[alanwill]

If the above extracts are done in reverse it fails:

>>> from netaddr import *
>>> splitter = SubnetSplitter('10.40.0.0/22')
>>> subnet_26s = splitter.extract_subnet(26, count=3)
>>> print splitter.available_subnets()
[IPNetwork('10.40.0.128/25'), IPNetwork('10.40.1.0/24'), IPNetwork('10.40.2.0/23')]
>>> subnet_24s = splitter.extract_subnet(24, count=3)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/lib/python2.7/site-packages/netaddr/contrib/subnet_splitter.py", line 28, in extract_subnet
    subnets = list(cidr.subnet(prefix, count=count))
  File "/lib/python2.7/site-packages/netaddr/ip/__init__.py", line 1271, in subnet
    raise ValueError('count outside of current IP subnet boundary!')
ValueError: count outside of current IP subnet boundary!

It looks like it's not merging what's available in order to perform the 2nd extract but instead taking the 3 subnets and trying to split those individually, is this expected?