when you think you're finally starting to understand some Haskell and then you start reading docspic.twitter.com/j12cmeMqow
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I've written a decent bit of Haskell and IMO most of the time you don't need to concern yourself with the advanced type stuff. Take ekmett's lens for example, which has very complex types, but you don't need to understand them to use it productively.
Learning about GHC's concurrency (STM etc), understanding laziness/memory/GC and maybe some Template Haskell and FFI will be far more useful for real code than knowing what a comonad is mathematically.
On the other hand in docs far more productive would be example of usage and at the end section on theoretical details for completeness
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