docs: function renderAttributeString(values, context) {
    if (typeof values === 'string' || typeof values === 'boolean') {
      return values;
    }
  
    var buffer = '';
    var toString = new ToString();
    for (var i = 0; i < values.length; i++) {
      toString.clear();
      render(toString, values[i], context);
      buffer += toString.getOutput();
    }
  
    return buffer;
  }