February 27, 2026 For nearly three decades, CRuby (MRI) has been overwhelmingly a C codebase. That stability has been both a strength and a constraint. Recently, however, something genuinely new appeared inside the official Ruby repository: Parts of Ruby itself are now written in Rust. This is not theoretical, experimental folklore, or third-party tooling. It … Continue reading 🦀 Rust Inside Ruby Core: A New Systems Layer for MRI →