[Haskell-cafe] Mutable arrays

[Jeff φ]

>
> IO(U)Arrays are only one variant of mutable Array, there are also
> ST(U)Arrays,
> which are often preferred.
>

I should have worded my question better.  The MArray interface is
implemented in both the ST and IO monad.  A state monad seems like a logical
place for mutable arrays.  However, I don't understand the motivation for
implementing it in IO.  Were mutable arrays added to IO because it would be
difficult to write code that does both IO and manipulates arrays otherwise?
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