Preserve the storage location of the down node of a pair of joined nodes when deleting, where possible.
Preserve the storage location of the down node of a pair of joined nodes
when deleting, where possible.

pecharmin/bind9,each/bind9-collab,pecharmin/bind9,pecharmin/bind9,pecharmin/bind9,pecharmin/bind9,each/bind9-collab,each/bind9-collab,each/bind9-collab,pecharmin/bind9,each/bind9-collab,each/bind9-collab