> Do we still have atomicModifyIORef?
>
> I don't know that there's that much point now that Haskell finalizers
> are gone. I don't have a strong objection (esp. since it seems every
> implementation now has it) but it doesn't seem so necessary now.
It ought to be significantly faster than using MVars if you can get away
with it. I haven't measured it though.
Cheers,
Simon
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