To achieve this milestone: (1) the Storage client will support bidi streaming reads (probably via a open_object() method), (2) this includes support for redirects, read handles, and routing tokens, (3) the RPC can be mocked in customer tests, (4) we have a benchmark showing what the latency for ranged reads is against Regional Buckets and Zonal Buckets, (5) the performance results are no embarrassing in ZB.