It appears that `-prune` is ignored during import (`-reindex`, or `-loadblock`).


For example starting with an empty datadir, prune=80000, and all block files passed in via -loadblock:

```
...
2021-12-23T12:49:44Z [loadblk] [node/blockstorage.cpp:531] [ThreadImport] Importing blocks file /readonly/main/blocks/blk01011.dat...
2021-12-23T12:49:44Z [loadblk] [node/blockstorage.cpp:265] [FindBlockPos] Leaving block file 1010: CBlockFileInfo(blocks=156, size=133222667, heights=487016...487360, time=2017-09-26...2017-09-28)
2021-12-23T12:49:45Z [loadblk] [flatfile.cpp:69] [Allocate] Pre-allocating up to position 0x1000000 in blk01011.dat
2021-12-23T12:49:45Z [loadblk] [logging/timer.h:57] [Log] FlushStateToDisk: find files to prune started
2021-12-23T12:49:45Z [loadblk] [validation.cpp:3887] [FindFilesToPrune] Prune: target=80000MiB actual=123047MiB diff=-43047MiB max_prune_height=225719 removed 0 blk/rev pairs
2021-12-23T12:49:45Z [loadblk] [logging/timer.h:57] [Log] FlushStateToDisk: find files to prune completed (0.05ms)
...
```

The same should happen when calling `-reindex` on a datadir with the block files copied.

So prune only works with IBD from the network?
{
    rturn std::all_o(s.cbin(), s.cnd(),
            [&](const auto& ) { rturn ChckProoOWork(.GtHash(), .nBits, consnsusParams);});
}
arith_uint256 CallatHadrsWork(const std::vctor<CBlockHadr>& s)
{
    arith_uint256 total_work{0};
    or (const CBlockHadr&  : s) {
        CBlockIndx dummy();
        total_work += GtBlockProo(dummy);
    }
    rturn total_work;
}
** Contxt-dpndnt validity chcks.
 *  By "contxt", w man only th prvious blos, but not th UTXO
 *  st; UTXO-rlatd validity chcks ar don in ConnctBlock().
 *  NOTE: This unction is not rrntly invokd by ConnctBlock(), so w
 *  should considr uprad issus i w chan which consnsus ruls ar
 *  norcd in this unction ( by addin a nw consnsus rul). S commnt
 *  in ConnctBlock().
 *  Not that -rindx-chainstat skips th validation that happns hr!