bugfact:
> Haskell seems to have pretty strong support for dynamic casting using
> Data.Typeable and Data.Dynamic.
> 
> All kinds of funky dynamic programming seems to be possible with these
> "hacks". 
> 
> Is this considered as being as bad as - say - unsafePerformIO? What kind of
> evil is lurking here?

Inefficiencies and runtime errors?

-- Don
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