I have the CAS and the key and I just want to figure out if the key+CAS is still valid or not. I do not actually need to load the document. I am trying to use Observe for this with Zero for persist and replicate. This works well when the key+CAS exist, but seems to cause hanging behavior when the CAS has changed. I am using 220.127.116.11 client and 3.0.1 server. Is this a known issue or am I just using this call in the wrong manner?