Why is there no mapToInt() in the OptionalInt class?

Question

The IntStream class has map(), mapToObj(), mapToLong() and mapToDouble() methods, but those methods seem to

Answer 1

Rather obtusely you can do

OptionalInt oi = OptionalInt.of(1);
oi.ifPresent(i -> IntStream.of(i).map(j -> j + 1).forEach(System.out::println));

However it is not clear why OptionalInt doesn't have the same methods as IntStream although I note Optional has a subset of Stream