History of CasFs::attr 1 change

In crates/flow-casfs/src/main.rs, lines 164–194 on 39dba8493cb076474a26e0ef752764053bde97678b581074594ca64f825c6185. 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.