code: public static LongLongIndex.LongLongUIndex createUniqueIndex(PAGE_TYPE type, 
  			IOResourceProvider storage, int keySize, int valSize) {
  		return CREATE_UNIQUE_INDEX_SIZED.create(type, storage, keySize, valSize);
  	}
docs: EXPERIMENTAL! Index that has bit width of key and value as parameters.
  @param type The page type for index pages
  @param storage The output stream
  @param keySize The number of bytes required by the key
  @param valSize The number of bytes required by the value
  @return a new index