[pjmlp]

That is why Valhala is on a decade now, sadly.

The core design goal is how to add value type semantics, including existing classes like Optional, while not breaking existing libraries, those JARs should work as much as possible on values aware JVM.

This is how do we add Perl 6 like features to Perl 5, without requiring people to migrate to Roku, as example.

[nbittich]

I like how they try hard not to say just "structs". another one is "codes like a class, works like an int". as if they were ashamed of the word struct. value type semantics is just that, plus few extra rules for some reasons (forced immutability is one of them iirc).