History of deepen 2 changes

In src/cli/sync.rs, lines 684–706 on a5d2fbe7c10df698334c69fcd588122ec62cf1c9c77d1bf075e4a2cece59d21a. 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 684,706:src/cli/sync.rs.