@Override
	public DBCachedObjectStoreKeySet descendingSet() {
		return new DBCachedObjectStoreKeySet(store, errHandler, lock, Direction.reverse(direction));
	}
This provides the implementation of {@link Map#keySet()} for {@link DBCachedObjectStore#asMap()}
Ghidra/Debug/ProposedUtils/src/main/java/ghidra/util/database/DBCachedObjectStoreKeySet.java