@Override
		boolean typedContains(Long u) throws IOException {
			if (cache.get(u) != null) {
				return true;
			}
			return table.hasRecord(u);
		}
The implementation of {@link BoundedStuff} to facilitate the implementation of
{@link Map#keySet()}.

<p>
Because tables let us navigate keys directly, we use the key as the raw component here
instead of the full record.
Ghidra/Debug/ProposedUtils/src/main/java/ghidra/util/database/DBCachedObjectStore.java