`CompareModifiedEntry`, as used in

https://github.com/bitcoin/bitcoin/blob/3c098a8aa0780009c11b66b1a5d488a928629ebf/src/miner.h#L97-L112

will trigger a compile-time error in many `const` operations of index #1 of `indexed_modified_transaction_set` because `CompareModifiedEntry::operator()` is not `const`.

Most likely related to:

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=224129
{
private:
    uint32_t nCheckFrequency; 
    unsigned int nTransactionsUpdated; 
    CBlockPolicyEstimator* minerPolicyEstimator;
    uint64_t totalTxSize;      
    uint64_t cachedInnerUsage; 
    mutable int64_t lastRollingFeeUpdate;
    mutable bool blockSinceLastRollingFeeBump;
    mutable double rollingMinimumFeeRate; 
    void trackPackageRemoved(const CFeeRate& rate);
public:
    static const int ROLLING_FEE_HALFLIFE = 60 * 60 * 12; 
    typedef boost::multi_index_container<
        CTxMemPoolEntry,
        boost::multi_index::indexed_by<
            
            boost::multi_index::hashed_unique<mempoolentry_txid, SaltedTxidHasher>,
            
            boost::multi_index::ordered_non_unique<
                boost::multi_index::tag<descendant_score>,