code: func (db *BytesConnectionRedis) NewTxn() keyval.BytesTxn {
  	if db.closed {
  		db.Error("NewTxn() called on a closed connection")
  		return nil
  	}
  	db.Debug("NewTxn()")
  
  	return &Txn{db: db, ops: []op{}, addPrefix: nil}
  }
docs: // NewTxn creates new transaction.