@Override
	public DBCachedObjectStoreKeySubSet headSet(Long toElement) {
		return headSet(toElement, false);
	}
This provides the implementation of {@link Map#keySet()} for {@link DBCachedObjectStore#asMap()}
Ghidra/Debug/ProposedUtils/src/main/java/ghidra/util/database/DBCachedObjectStoreKeySet.java