code: func (o *ObjectToPack) SaveOriginalMetadata() {
  	if o.Original != nil {
  		o.originalSize = o.Original.Size()
  		o.originalType = o.Original.Type()
  		o.originalHash = o.Original.Hash()
  		o.resolvedOriginal = true
  	}
  }
docs: // SaveOriginalMetadata saves size, type and hash of Original object