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Source files sharing (st_dev,st_ino) are recreated as hard links on the destination; only the first member's data crosses the wire (siblings ride a payload-less STATUS_HARDLINK frame). Ordering requires the single-FIFO-writer receiver + forced sequential scan (documented). link()-failure falls back to a byte-identical local copy. Rejects -s/--append. PROTOCOL_VERSION 2.11.0->2.12.0. Review fixes: delete the dead HardLinkRegistry (ordering holds by FIFO writer), and --existing no longer aborts when the first member is absent but the sibling exists (leaves the sibling in place).