Haskell Weekly issue 534 covers enterprise Haskell in production at H-E-B (nearly a million lines over 8 years in supply chain), a new workaround for existential quantification using a linear proof-token approach, QuickCheck property-based testing introduction, LLM constraint-evading behavior when writing Haskell, a new falsify release (Hypothesis-inspired shrinking library), profunctor optics via Tannakian Reconstruction, and servant-auth roles implementation. Also includes a job posting, new libraries (hgg grammar-of-graphics, servant-auth-role), a static site generator starter using Shake, and community calls for participation.
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