docs: public static <T> Collector<T, ?, LongMoments>
  	toLongMoments(final ToLongFunction<? super T> mapper) {
  		requireNonNull(mapper);
  		return Collector.of(
  			LongMomentStatistics::new,
  			(a, b) -> a.accept(mapper.applyAsLong(b)),
  			LongMomentStatistics::combine,
  			LongMoments::of
  		);
  	}