Node local dns for dual-stack

We set up kubernetes dual-stack clusters and want to use node-local dns. When checking the code I see that only one IP familiy is supported at time (https://github.com/kubernetes/dns/blob/fe97ec9fa1ee596315827138f693b68bcab51ff8/cmd/node-cache/main.go#L104-L106). What is the reason for that? Can we also add dual-stack support to the kubernetes node-cache?

Start in cmd/node-cache/main.go at lines 104-106, where the issue identifies the single-IP-family behavior. Trace why only one family is supported and determine the changes needed for dual-stack Kubernetes clusters; done means node-cache supports both IP families and the behavior is covered by relevant tests.

Written by the indexing model from the issue text.