Mixed mode (cert auth and bucket password) not failed

var couchbase = require('couchbase')

var cluster = new couchbase.Cluster('couchbases://10.142.175.101?certpath=/Users/daschl/tmp/ks/chain.pem&keypath=/Users/daschl/tmp/ks/pkey.key');

cluster.authenticate(couchbase.CertAuthenticator);

var bucket = cluster.openBucket('pixels', 'blarb', function(err) {

        console.error(err);

});

bucket.upsert('user:king_arthur', {

    'email': 'kingarthur@couchbase.com', 'interests': ['Holy Grail', 'African Swallows']

  },

  function (err, result) {

}

);