History of CasFs::attr 1 change

In crates/flow-casfs/src/main.rs, lines 164–194 on 8f2752bfaa09c94e5f7325c66c1dfe67a6745c821109e6694e37812096a86497. 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 164,194:crates/flow-casfs/src/main.rs.