code: func (n *node) getBytes(tx *bolt.Tx, bucketName string, id []byte) ([]byte, error) {
  	bucket := n.GetBucket(tx, bucketName)
  	if bucket == nil {
  		return nil, ErrNotFound
  	}
  
  	raw := bucket.Get(id)
  	if raw == nil {
  		return nil, ErrNotFound
  	}
  
  	return raw, nil
  }
docs: // GetBytes gets a raw value from a bucket.