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Ruby 4.0 Released with ZJIT Compiler and Ruby Box Feature

First seen 26 Dec 2025, 20:13 UTC •News.Ycombinator •22

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Ruby 4.0.0 has been released, introducing the ZJIT just-in-time compiler and the experimental Ruby Box feature. ZJIT aims to enhance performance, while Ruby Box provides isolation for definitions and changes within Ruby applications. The development of ZJIT began earlier this year by a team of contributors.

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