method_missing

# File activesupport/lib/active_support/multibyte/chars.rb, line 61
      def method_missing(method, *args, &block)
        result = @wrapped_string.__send__(method, *args, &block)
        if /!$/.match?(method)
          self if result
        else
          result.kind_of?(String) ? chars(result) : result
        end
      end