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Eta-expansion chapter
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Description
Chapter on how eta-expansion can change performance.
- should show the core and stg
- need benchmarks for this
- might add it to canonical programs section
- consider describing the `oneShot` monad trick
References from around the web:
- https://mail.haskell.org/pipermail/haskell-cafe/2022-June/135383.html
- https://discourse.haskell.org/t/memoization-performance/4709
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