code: func (tx *bytesTxn) Commit(ctx context.Context) error {
  	_, err := tx.kv.Txn(ctx).Then(tx.ops...).Commit()
  	return err
  }
docs: // Commit commits all operations in a transaction to the data store.
  // Commit is atomic - either all operations in the transaction are
  // committed to the data store, or none of them.