History of CloudStore::block 3 changes

In crates/oxy-strata/src/lib.rs, lines 616–641 on 34c777f8893a62a417cf5e9b2438e8309452d6a8abce5f79b8af94654d6892e6. Every change that wrote or deleted one of these lines, or deleted a line from between them. Exact, because each line keeps its identity across edits; edits elsewhere in the file are not here. Also: oxy log -L 616,641:crates/oxy-strata/src/lib.rs.