code: function columnize(target) {
      var columns = typeof target === 'string' ? [target] : target;
      var str = '',
          i = -1;
      while (++i < columns.length) {
        if (i > 0) {
          str += ', ';
        }
        str += this.wrap(columns[i]);
      }
      return str;
    }
docs: Accepts a string or array of columns to wrap as appropriate.