Is this a preview feature in mainline, or are they still working on a branch?
I couldn't tell from the page.
I couldn't tell from the page.
Not sure if there is any relevant reason for this to be posted at this particular point in time. The most recent early-access build is from 2022: https://jdk.java.net/valhalla/
Edit: regarding replies about the recent update date -- that update date is tied to the linked Jira issue (https://bugs.openjdk.org/browse/JDK-8251554) and the only activity four days ago was adding links to some related issues. There were some updates to the description two months ago but the History view makes it difficult to determine what those are without manually copy-and-pasting the old revisions into some sort of diff tool
When I noticed the "preview feature" wording I went and tried running it with --enable-preview on a mainline OpenJDK build, but value records still didn't compile, and then I went back and saw that that wording has been on the JEP for some time.
There are also more up-to-date Valhalla builds available at builds.shipilev.net, but I'm not sure if there's some specific reason they haven't updated the EA page in years or if it's just not a priority.
Still can't tell what that direction is though.