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