code: private void ensureCapacity(int wordsRequired) {
  		if (words.length < wordsRequired) {
  			// Allocate larger of doubled size or required size
  			int request = Math.max(2 * words.length, wordsRequired);
  			words = Arrays.copyOf(words, request);
  			sizeIsSticky = false;
  		}
  	}
docs: Ensures that the BitSet can hold enough words.
  @param wordsRequired the minimum acceptable number of words.