:format set as :marshal generates Couchbase::Error::ValueFormat

If the :format is set as :marshal in get method the Couchbase::Error::ValueFormat error is generated regradless of the type of value: numerical, string or JSON object.

client = Couchbase.connect("http://localhost:8091")
print client.set("catalog","journal")
print client.get("catalog",:format => :marshal)

#print client.set("3", 1)
#print client.get("3",:format => :marshal)