[Haskell-cafe] help diagnosing space leak with IORef/STRef, just incrementing a million times.

[Thomas Bereknyei]

I have had issues like this with modifySTRef before. Try to make a strict
version modifySTRef'

If memory serves, something like this worked for me.
modifySTRef' r f =
  do
    a <- readSTRef r
    writeSTRef r $! f a
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