# File lib/action_mailer/vendor/tmail-1.1.0/tmail/encode.rb, line 42
    def create_dest( obj )
      case obj
      when nil
        StringOutput.new
      when String
        StringOutput.new(obj)
      when IO, StringOutput
        obj
      else
        raise TypeError, 'cannot handle this type of object for dest'
      end
    end