protected long expOperationByteGasCost() {
    return EXP_OPERATION_BYTE_GAS_COST;
  }
Returns the gas cost for a byte in the {@link ExpOperation}.

@return the gas cost for a byte in the exponent operation
evm/src/main/java/org/hyperledger/besu/evm/gascalculator/FrontierGasCalculator.java