[m-rev.] for review: start integrating stream typeclasses into stdlib

[Ralph Becket]

Ian MacLarty, Friday, 27 October 2006:
> 
> Does using the io equivalence type instead of io.state in these instance
> declarations cause problems?  I'd prefer it if we could use the
> equivalence type to be more consistent with the rest of the io module.
> 
> Otherwise that looks fine.

Would there be any problem with making io.io the concrete type and
io.state the equivalence?  (And similarly for char/character?)
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