Standarize GHC.Prim.Any

[Maciej Piechotka]

I'm so sorry if I've done it wrong - it's my first contact with Haskell
standardization and I base on
http://hackage.haskell.org/trac/haskell-prime/wiki/Process . I hope it
is not too late as well.

Any from GHC.Prim makes unsafeCoerce much useful and safe. Can it be
included in Unsafe.Coerce module?

Pros:
- unsafeCoerce is much more useful with Any (it's a safe placeholder for
any value and therefore can be passed simply in/out FFI).
Cons:
- unsafeCoerce is useful, but not very nice, platorm-dependent low-level
anyway.

Best regards
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