code: @SafeVarargs
      public final WordBuilder<I> append(I... symbols) {
          if (symbols.length == 0) {
              return this;
          }
          ensureAdditionalCapacity(symbols.length);
          System.arraycopy(symbols, 0, array, length, symbols.length);
          length += symbols.length;
          return this;
      }
docs: Appends several symbols to the contents of the internal storage.
  
  @param symbols
  the symbols to append
  
  @return {@code this}