@Override
  protected void internalPenalize(final PendingTransaction penalizedTx) {
    orderByFee.remove(penalizedTx);
    penalizedTx.decrementScore();
    orderByFee.add(penalizedTx);
  }
Holds the current set of executable pending transactions, that are candidate for inclusion on
next block. The pending transactions are kept sorted by paid fee descending.
ethereum/eth/src/main/java/org/hyperledger/besu/ethereum/eth/transactions/layered/AbstractPrioritizedTransactions.java