def remove_highest(var)
      configs.each do |c|
        if c.has_var?(var)
          return c.remove_var(var)
        end
      end

      # return nil if we haven't returned a value yet
      nil
    end
def remove_highest(var)
      configs.each do |c|
        if c.has_var?(var)
          return c.remove_var(var)
        end
      end

      # return nil if we haven't returned a value yet
      nil
    end
Dynamically remove the highest instance of :var