History of helper 1 change

In crates/flow/src/syscall.rs, lines 485–516 on 33682a3988fc3a4d213d0ef3c22c4fcb7f2e7f60b6c69da2db3d884e28aaf1b0. 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 485,516:crates/flow/src/syscall.rs.