RFR: 8179918: EnumSet spliterator should report SORTED, ORDERED, NONNULL [v6]

[Viktor Klang]

On Wed, 3 Dec 2025 18:58:26 GMT, Patrick Strawderman <duke at openjdk.org> wrote:

>> I noticed that the Spliterator for EnumSet does not report SORTED, ORDERED, or NONNULL characteristics, all of which are inherent to API of EnumSet. I found there's an existing ticket for this as well.
>> 
>> The ticket also mentions optimized `forEach`, etc, which I presume means avoiding the default implementation that uses the iterator and just iterating over the bitset directly; I can add that here or perhaps in a follow up if it's still deemed worthwhile.
>
> Patrick Strawderman has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Fix test

test/jdk/java/util/EnumSet/EnumSetSpliteratorTest.java line 66:

> 64:         assertSpliteratorCharacteristics(EnumSet.allOf(Empty.class));
> 65:         assertSpliteratorCharacteristics(EnumSet.allOf(Small.class));
> 66:         assertSpliteratorCharacteristics(EnumSet.allOf(Large.class));

For the sake of completeness, it probably makes sense to test the characteristics of `EnumSet.of(…)`, `EnumSet.range(…)`, and `EnumSet.noneOf(…)` as well.

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PR Review Comment: https://git.openjdk.org/jdk/pull/28568#discussion_r2589995448