I have a question. In v0.21.0, Iterator#_next_page() is private method. https://github.com/GoogleCloudPlatform/google-cloud-python/blob/master/datastore/google/cloud/datastore/query.py#L482 Until v0.20.0, Iterator#next_page() is public method. Is google.cloud.datastore.query.Iterator#next_page() no longer supported?