public PersistentMapBuilder<Key, Value> copy() {
    return new PersistentMapBuilder<>(
      myFile, myKeyDescriptor, myValueExternalizer,
      myInitialSize, myVersion, myLockContext, myInlineValues, myIsReadOnly, myHasChunks, myCompactOnClose,
      myWalExecutor, myEnableWal
    );
  }
public PersistentMapBuilder<Key, Value> copy()