code: func (b *Bucket) SetSequence(v uint64) error {
  	if b.tx.db == nil {
  		return ErrTxClosed
  	} else if !b.Writable() {
  		return ErrTxNotWritable
  	}
  
  	// Materialize the root node if it hasn't been already so that the
  	// bucket will be saved during commit.
  	if b.rootNode == nil {
  		_ = b.node(b.root, nil)
  	}
  
  	// Increment and return the sequence.
  	b.bucket.sequence = v
  	return nil
  }
docs: // SetSequence updates the sequence number for the bucket.