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ooops, my bad. I remember, that Aleksey Shipilëv explained why even `final static` fields are not constant-folded by JIT, and thought that record classes which were introduced later, is the same.

It means, that `StableValue<>` can be used in simple classes (where `final` fields are still not constant-folded) and, additionally, supports late initialization.

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Yeah the Java team took the opportunity while introducing the new record feature to explicitly forbid mutating their final fields. Their intention is to eventually enforce the same invariants across all Java fields unless the JVM is passed an explicit opt-out flag. And if you're not reliant on any frameworks using reflection to modify final fields, there's already a flag you can use today which will instruct the JVM to "trust" and apply optimizations to `final`.

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