History of CloudStore::block 3 changes

In crates/oxy-strata/src/lib.rs, lines 602–627 on 767ac6cd0545ed1a1ef3f45bbfdd1bebcff222df95616f20491d0bb68c188570. 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 602,627:crates/oxy-strata/src/lib.rs.