Investigate JEP 401: Value Classes and Objects (Preview)

[He-Pin]

Enhance the Java Platform with value objects: class instances that have only final fields and lack object identity.

refs: https://openjdk.org/jeps/401

https://kotlinlang.org/docs/inline-classes.html
https://github.com/Kotlin/KEEP/blob/master/notes/value-classes.md
scala-native/improvement-proposals#1

[bishabosha]

JDK Early Access build with value classes and objects is now available: https://jdk.java.net/valhalla/ (Build 26-jep401ea2+1-1 (2025/10/10))

[SethTisue]

some previous discussions:

• 2017 https://contributors.scala-lang.org/t/valhalla-and-improving-value-types/1084/8
• 2022 https://contributors.scala-lang.org/t/are-there-any-plans-to-introduce-valhalla-support-to-scala-in-near-future/5964

[TheDrawingCoder-Gamer]

pre-sip i had written:
https://contributors.scala-lang.org/t/pre-sip-extended-value-classes/7288

[lidaisy]

I am working on this issue and should have a PR ready in ~2 weeks!

[lidaisy]

Draft PR: #24705

[He-Pin]

https://kotlinlang.org/docs/inline-classes.html
https://github.com/Kotlin/KEEP/blob/master/notes/value-classes.md
scala-native/improvement-proposals#1

@insdami FYI