decr() function fails gracelessly

While learning more about the functions in the vbucketawareclient I tried .decr() with minimal parameters. I lost control of my Python session as it didn't really fail gracefully. I wasn't really trying to make it work, but think this is broken and really hard to test further because of this tie-up.

Test script:

from couchbase.couchbaseclient import VBucketAwareCouchbaseClient as client
server = "http://localhost:8091/pools/default"
v = client(server,"default","")

1. returns 11210
   v.set("TESTKEY",0,0,"TESTVALUE")
2. returns (4020540899, 602, '')
   v.decr("TESTKEY",1)
   #[2011-08-11 16:51:52,415] - [couchbaseclient] [4320661504] - ERROR - 'amount'
   #[2011-08-11 16:51:52,627] - [couchbaseclient] [4320661504] - ERROR - 'amount'
   #[2011-08-11 16:51:52,827] - [couchbaseclient] [4320661504] - ERROR - 'amount'
   #.. never ends