Baton defines a waitUntil method, but not a sleepFor method. As a result, it doesn't pass template substitution for the SleepableExecutor argument throughout the AsyncTry infrastructure. This seems like a missed opportunity to cheaply support synchronous retry loops with backoffs, which we don't appear to formally support in any way currently.

Investigate adding a sleepFor method to Baton and using Baton as a SleepableExecutor in AsyncTry loops. Either commit the change or document why we can't.