There is a plenty diversity in information units through the code, command-line options, GUI and logs. Here are some examples:

`-dbcache`
**megabytes** in CL and GUI _vs_ **MiB** in logs and code (constants in [txdb.h](https://github.com/bitcoin/bitcoin/blob/master/src/txdb.h))

`-prune`
**MiB** in CL _vs_ **GB** in GUI. Also, setting prune = 1 GB in GUI gives _incorrect_ prune target = 1000 MiB.

Which prefix type -- binary (a power of 2) or SI (a power of 10) -- is preferable in the Bitcoin Core project?
mapper->addMapping(ui->threadsScriptVerif, OptionsModel::ThreadsScriptVerif);
    mapper->addMapping(ui->databaseCache, OptionsModel::DatabaseCache);
    mapper->addMapping(ui->prune, OptionsModel::Prune);
    mapper->addMapping(ui->pruneSize, OptionsModel::PruneSize);
    
    mapper->addMapping(ui->spendZeroConfChange, OptionsModel::SpendZeroConfChange);
    mapper->addMapping(ui->coinControlFeatures, OptionsModel::CoinControlFeatures);
    
    mapper->addMapping(ui->mapPortUpnp, OptionsModel::MapPortUPnP);
    mapper->addMapping(ui->allowIncoming, OptionsModel::Listen);
    mapper->addMapping(ui->connectSocks, OptionsModel::ProxyUse);
    mapper->addMapping(ui->proxyIp, OptionsModel::ProxyIP);
    mapper->addMapping(ui->proxyPort, OptionsModel::ProxyPort);
    mapper->addMapping(ui->connectSocksTor, OptionsModel::ProxyUseTor);
    mapper->addMapping(ui->proxyIpTor, OptionsModel::ProxyIPTor);
    mapper->addMapping(ui->proxyPortTor, OptionsModel::ProxyPortTor);
    
#ifndef Q_OS_MAC
    if (QSystemTrayIcon::isSystemTrayAvailable()) {
        mapper->addMapping(ui->hideTrayIcon, OptionsModel::HideTrayIcon);
        mapper->addMapping(ui->minimizeToTray, OptionsModel::MinimizeToTray);
    }
    mapper->addMapping(ui->minimizeOnClose, OptionsModel::MinimizeOnClose);
#endif
    
    mapper->addMapping(ui->lang, OptionsModel::Language);
    mapper->addMapping(ui->unit, OptionsModel::DisplayUnit);
    mapper->addMapping(ui->thirdPartyTxUrls, OptionsModel::ThirdPartyTxUrls);
}
void OptionsDialog::setOkButtonState(bool fState)