code: func fixupTxnOps(raw interface{}) error {
  	rawSlice, ok := raw.([]interface{})
  	if !ok {
  		return fmt.Errorf("unexpected raw type: %t", raw)
  	}
  	for _, rawOp := range rawSlice {
  		if err := fixupTxnOp(rawOp); err != nil {
  			return err
  		}
  	}
  	return nil
  }
docs: // fixupTxnOps takes the raw decoded JSON and base64 decodes values in Txn ops,
  // replacing them with byte arrays.