Lock TTL=0 fails.

The documentation says "If set to 0 it will use the default lock timeout on the server."

http://pythonhosted.org/couchbase/api/couchbase.html#couchbase.connection.Connection.lock

However when I use ttl=0 I get this error:

Using PYCBC=1.2.2, LCB=('2.1.2', 131330)
Setting
6425942093814169600
Locking with: lock = cb.lock("lock", ttl=0)
Traceback (most recent call last):
File "./lock.py", line 12, in <module>
lock = cb.lock("lock", ttl=0)
File "/Library/Python/2.7/site-packages/couchbase/connection.py", line 594, in lock
return _Base.lock(self, key, ttl=ttl)
couchbase.exceptions.ArgumentError: <Lock must have an expiry, C Source=(src/get.c,107)>

Code example:

#!/usr/bin/python
import couchbase
from couchbase import Couchbase, Connection

print "Using PYCBC=

, LCB=

".format(couchbase._version_, Connection.lcb_version())
cb = Couchbase.connect(bucket='default', host='localhost')

print "Setting"
doc = cb.set("lock","test")
print doc.cas
print "Locking with: " + 'lock = cb.lock("lock", ttl=0)'
lock = cb.lock("lock", ttl=0)
print lock.cas