public byte getEthSerializedType() {
    return (this == FRONTIER ? 0x00 : this.getSerializedType());
  }
Gets serialized type for returning in an eth transaction result, factoring in the special case
for FRONTIER transactions which have enum type 0xf8 but are represented as 0x00 in transaction
results.

@return the serialized type
datatypes/src/main/java/org/hyperledger/besu/datatypes/TransactionType.java