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Ruby 4.0 introduces several key updates, including a new JIT compiler called ZJIT, improvements to Ractors, and an experimental feature for isolated namespaces called Ruby::Box. The release aims to enhance performance and usability without major breaking changes.
Ruby 4.0.0 introduces experimental features like Ruby Box for isolating definitions and ZJIT, a next-generation just-in-time compiler. It also includes improvements to Ractor for parallel execution and various updates to core classes and methods.