code: func (iter *TagIter) Next() (*Tag, error) {
  	obj, err := iter.EncodedObjectIter.Next()
  	if err != nil {
  		return nil, err
  	}
  
  	return DecodeTag(iter.s, obj)
  }
docs: // Next moves the iterator to the next tag and returns a pointer to it. If
  // there are no more tags, it returns io.EOF.