def instantiate_modules
      mods = Array(modules)
      mods = load!(mods) if callback?(:load)
      Array(mods).map do |klass|
        init!(klass) || klass.new(fetchable)
      end
    end
def instantiate_modules
      mods = Array(modules)
      mods = load!(mods) if callback?(:load)
      Array(mods).map do |klass|
        init!(klass) || klass.new(fetchable)
      end
    end
Array of instantiated fetch modules.