def number_range(col, start_number, end_number, arg, block)
        operation = " #{start_number} <= [value] && [value] <= #{end_number}"
        pivot["#{start_number}-#{end_number}"] = { col: col, operation: operation }
      end
def number_range(col, start_number, end_number, arg, block)
        operation = " #{start_number} <= [value] && [value] <= #{end_number}"
        pivot["#{start_number}-#{end_number}"] = { col: col, operation: operation }
      end
Adds a number range filter