void addKeys(short startKey, short endKey) {
        if ((startKey == 0) && (endKey == pageSize-1)) {
            keySet = new FullKeySet(pageSize);
        }
        else {
            for(short i = startKey;i<=endKey;i++) {
                addKey(i);
            }
        }
    }
Adds the key to the keySet. If all values are set,
use FullBitSet.
@param key The key to be added to the set.
Ghidra/Framework/Generic/src/main/java/ghidra/util/map/ValueStoragePage.java