code: public WordBuilder<I> truncate(int truncLen) {
          if (truncLen >= length) {
              return this;
          }
  
          ensureUnlocked();
          for (int i = truncLen; i < length; i++) {
              array[i] = null;
          }
  
          length = truncLen;
  
          return this;
      }
docs: Truncates the contents of the initial storage to the given length.
  
  @param truncLen
  the length to truncate to
  
  @return {@code this}