The "map" type is expected to be expanded from `:map:key:prepend` to: ``` :prefix:all:key:prepend: :bad:server::key: :bad:client:prepend:: :ok:all:: ``` or if `key` is empty: ``` :prefix::prepend: :bad:all:: ``` --- https://gitlab.com/virtio-fs/virtiofsd/-/issues/40