haskell / haskell/containers

Why doesn't the `IntMap` and `IntSet` code use pointer equality checks to improve sharing and reduce allocations?

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IntMap IntSet performance
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Haskell
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Description

There's quite a bit of `ptrEq` usage in the `Map` and `Set` code. Why isn't there anything similar in the corresponding `IntMap` and `IntSet` code?

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