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Note all the new cool stuff is incubator and preview status and I'm a little worried that this will still be the case for the JDK 21 stable release.
I think this is supposed to be the last preview version of FFI and the other JEPs from Project Panama, so hopefully we will have them at least but I definitely share a bit of that concern.
Better to be right then rushed though.
Announcement: https://inside.java/2023/03/21/the-arrival-of-java-20/
VM improvements: https://tschatzl.github.io/2023/03/14/jdk20-g1-parallel-gc-c...
Non-JEP Improvements: https://nipafx.dev/java-20-guide/
Gist: ``` JDK 20 introduces six features: - Scoped values for safe sharing of data across threads - Record patterns for declarative data navigation and processing - Foreign function and memory API for interoperation with code and data outside the Java runtime - Virtual threads for lightweight concurrent programming - Structured concurrency for simplified multithreaded programming - Pattern matching for switch stateme…
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That's another huge effort which delivered us an imperfect abstraction.
I would prefer to have HKTs and typeclasses, so I may implement my own IO monad.