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Unit (CLI): --fuzzy --no-incremental (either order) stays a valid plain-mode config -- no forced handshake, no delta implication; --fuzzy --no-delta stays covered. Integration (TestFuzzy): - worthless basis: a sibling that passes the name+size gates but shares no blocks makes the sender reply STATUS_NEXT; the whole file is consumed inside the delta handshake with byte-exact output (no protocol desync). - non-displacement: an existing exact-path destination file INSIDE the delta size bounds (same size, different content, older mtime) is used as the delta basis instead of a byte-identical similar sibling (whole-file wire cost). - asymmetric bases: basis larger than source (prefix reuse) and basis smaller than source (appended tail as literals) both reconstruct byte-exactly with a small delta. - --no-fuzzy end-to-end equals the no-flag whole-file behavior. CountingProxy closes its listener socket (fd hygiene).