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For more details about using Eff, how it works, and how to define your own side effects, see this post.
Pure Script can encode Java Script-style objects directly by using row types, so Haskell-style record definitions actually have quite a different meaning in Pure Script: Overlapping instances are still disallowed, like in Haskell.
The instance names are used to help the readability of compiled Java Script.
Unlike Haskell, orphan instances are completely disallowed in Purescript.
It should also be possible to write higher performance code when needed, as introducing laziness on top of Java Script comes with an unavoidable overhead.