@Override
    public int hashCode() {
      return Objects.hash(data, gas, value);
    }
Indexes in the "transaction" part of the general state spec json, which allow tests to vary the
input transaction of the tests based on the hard-fork.
ethereum/referencetests/src/main/java/org/hyperledger/besu/ethereum/referencetests/GeneralStateTestCaseSpec.java