
in case dest key already contains the member, the dest key isn't modified, so the command shouldn't invalidate watch. (cherry picked from commit 11dc4e59b365d6cd8699604d7d1c1025b6bb6259)
in case dest key already contains the member, the dest key isn't modified, so the command shouldn't invalidate watch. (cherry picked from commit 11dc4e59b365d6cd8699604d7d1c1025b6bb6259)