code: protected <U> List<U> getConvertedContent(final Function<? super T, ? extends U> converter) {
  
      Assert.notNull(converter, "Function must not be null!");
  
      return stream().map(converter::apply).collect(Collectors.toList());
    }
docs: Applies the given {@link Function} to the content of the {@link Chunk}.
  
  @param converter must not be {@literal null}.
  @return