- CLI: each timing flag (+ --del alias) accepted and implies --delete;
conflicting timings and a timing with --no-delete are rejected.
- Config: delete_during/delete_delay survive config_send/config_receive;
two simultaneous timings are rejected by the receiver-side validation;
config_delete_timing_early() mapping is unit-tested.
- Integration (TCP, single- and multithreaded): every flag removes extras on
a successful transfer; early modes (--delete-before/--delete-during/--del)
delete before data is applied so a destination file blocking a nested
write is removed and the transfer succeeds, while plain --delete /
--delete-after / --delete-delay keep it and fail with every extra intact
(commit-style). Early timing also completes (without deleting) when the
server refuses deletion.
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