module CC
  module Yaml
    module Nodes
      class Dependencies < OpenMapping
        map :files, to: FileDependencyList
      end
    end
  end
end

module CC
  module Yaml
    module Nodes
      class Dependencies < Mapping
        map :files, to: FileDependencyList
      end
    end
  end
end

Make Dependencies a Mapping instead of an OpenMapping
Make Dependencies a Mapping instead of an OpenMapping

We don't need (or want, really) the "open" behavior here.
