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by Mathnerd314 3669 days ago
> there was never a situation when I said to myself "if only Data.HashMap (unordered-containers) was faster"

Here's a Haskell programmer looking for a faster hashmap: https://github.com/ndmitchell/shake/issues/418

Shake in fact does use reified generics (a.k.a. Dynamic/Typeable) and a Value type, and recommends disabling idle GC. I'm not sure if there's a "GC write barrier", Shake just uses MVar locks.