Thanks for the tip. A modified version of your suggestion worked for me:
unsafeFreezeMatrix :: MMatrix s -> ST s Matrix
unsafeFreezeMatrix (MMatrix x1 x2 marray) = do block <- unsafeFreeze marray
return $ Matrix x1 x2 block
However, just out of curiosity, I'm still curious at how I could do the
runSTMatrix, which would really be the icing on the cake in terms of client
usability.
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