History of CloudStore::block 3 changes

In crates/oxy-strata/src/lib.rs, lines 616–641 on 4476cdbb0443b2f9c638c85a4786b4da025a512072a22be3486aed4035d297ec. 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.