Block a user
Identity maps/chown/fake-super parity
Timeouts/max-alloc/temp-dir parity
Connectivity/daemon parity details
Docs: RSYNC_COMPAT.md/README overclaim parity and stale facts
Checksum/compression parity: -c no-op without --incremental; choice subsets; seed/default
Deletion data-loss and semantics: files-from over-delete, delete-excluded, symlinks, max-delete
Selection/output: -x drops mount-point dir; --include/--exclude ordering and inline = forms
Output formatting parity: -i, --out-format, --list-only, --stats, -h units, --progress
--chmod parity: implies -p, no D/F/X, no append, sanitized
CLI: rsync short options and short-option clustering unsupported
Ownership: --numeric-ids enables chown under any metadata flag; directory ownership/xattrs/ACLs not applied
Symlink: --safe-links/--copy-unsafe-links semantics inverted; --munge-links is a no-op
Special nodes: --specials refuses sockets although mknod(S_IFSOCK) works unprivileged; --copy-devices is a no-op