class Array
  def stringify_all_keys
    map do |v|
      case v
      when Hash, Array
        v.stringify_all_keys
      else
        v
      end
    end
  end

  def symbolize_all_keys
    map do |v|
      case v
      when Hash, Array
        v.symbolize_all_keys
      else
        v
      end
    end
  end
end

class Hash
  def stringify_all_keys
    result = {}
    each do |k, v|
      result[k.to_s] = case v
                       when Hash, Array
                         v.stringify_all_keys
                       else
                         v
                       end
    end
    result
  end

  def symbolize_all_keys
    result = {}
    each do |k, v|
      result[k.to_sym] = case v
                         when Hash, Array
                           v.symbolize_all_keys
                         else
                           v
                         end
    end
    result
  end
end