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Description
As part of the "SDK3" effort, and to facilitate retry handling for app developers, implement sdk-rfc #49.
As of this writing, draft is here:
https://docs.google.com/document/d/1h9YL2k8uzNPnxN_XanagEc2d8qRVu6sVDiKaqASqjS4/edit#heading=h.95ju11kiipzo