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NFSv4 identity mapping: uid/gid -> user@domain / group@domain strings.
NFSv4 SETATTR OWNER/OWNER_GROUP attributes require utf8str_cs format (e.g. “aenertia@3d.ae.net.nz”), not numeric UIDs. The domain suffix comes from /etc/idmapd.conf [General] Domain, matching rpc.idmapd on the NFS server.