# File lib/geo_ruby/simple_features/polygon.rb, line 39
      def m_range
        if with_m
          max_m, min_m = -Float::MAX, Float::MAX
          each do |lr|
            lrmr = lr.m_range
            max_m = lrmr[1] if lrmr[1] > max_m
            min_m = lrmr[0] if lrmr[0] < min_m
          end
          [min_m,max_m]
        else
          [0,0]
        end
      end