Crash when trying to serialize view "keys" parameter

function (doc, meta) {

  emit(meta.id, doc);

}

#!/usr/bin/python3

import sys

from couchbase.cluster import Cluster

from couchbase.auth import PasswordAuthenticator

from couchbase.bucket import ViewScanConsistency

from couchbase.options import ViewOptions, ClusterOptions

from couchbase.management.views import DesignDocumentNamespace

pa = PasswordAuthenticator('Administrator', 'password')

cluster = Cluster('couchbase://127.0.0.1', ClusterOptions(pa))

bucket = cluster.bucket('default')

collection = bucket.default_collection()

result = bucket.view_query("test","ByDoc",ViewOptions(keys=["TestDoc_990999","TestDoc_999995"],namespace=DesignDocumentNamespace.PRODUCTION,scan_consistency=ViewScanConsistency.REQUEST_PLUS))

for row in result.rows():

    print("Key: {} ID: {} row: {}".format(row.key, row.id, row))

keys=["TestDoc_990999","TestDoc_999995"],