bigtable

In Chapter 5. Schema and Data Modeling first there is paragraph:

The default cardinality setting is SINGLE. Note, that property keys used on edges and properties have cardinality SINGLE. Attaching multiple values for a single key on an edge or property is not supported.

and then example:

mgmt = graph.openManagement()
follow = mgmt.makeEdgeLabel('follow').multiplicity(MULTI).make()

This is motivated by #5703. Applications may need to persist the state of pagination iterators, for example, because they are implementing a web service that returns pages of results.

I suggested this API:

struct Page {
  std::vector<std::string> bucket_names;
  std::string reader_state;
};

Page BucketsPage(gcs::Client client, std::string reader_state) {
  auto reader = client.

All public functions should either have type specs added or their existing ones checked