History of CloudStore::block 3 changes

In crates/oxy-strata/src/lib.rs, lines 593–618 on 30644f1ecb7b499d52f0c882211bffea40b8a2f1273a54c8faec1ff05d80d2ac. 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 593,618:crates/oxy-strata/src/lib.rs.