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d52ae45e9b
The cloner's codegen for map[K][]*V fields was doing a shallow append (copying pointer values) instead of cloning each element. This meant that cloned structs aliased the original's pointed-to values through the map's slice entries. Mirror the existing standalone-slice logic that checks ContainsPointers(sliceType.Elem()) and generates per-element cloning for pointer, interface, and struct types. Regenerate net/dns and tailcfg which both had affected map[...][]*dnstype.Resolver fields. Fixes #19284 Signed-off-by: Andrew Dunham <andrew@tailscale.com>