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Haskell Weekly

Haskell Weekly Issue 518 covers a range of community news and articles. Highlights include a detailed production engineering post from Mercury about running millions of lines of Haskell at scale in fintech, the release of GHC 9.12.4, a March 2026 GHC community update, a tutorial on the Traversable typeclass for Elm developers, and a project on writing an OS in Haskell. Shorter items include a new CSS class bindings library, an AI-friendly Haskell minifier (HSMin), a Bézier toolkit package, and pGenie, a SQL-first code generator for PostgreSQL. The show-and-tell section features a second alpha of hs-bindgen for automatic Haskell-C FFI bindings.