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Effect 4.0 is a ground-up rebuild of the TypeScript effect library, delivering a 5× smaller bundle, 6.4× higher concurrency throughput, 86% less memory per fiber, and zero runtime dependencies in the core package, alongside a new long-term support policy for every major version.
Bluefin, a Haskell effect system, is rebranded as a capability system to emphasize its use of value-level arguments for access control, drawing from capability-based security models.