Breaking Changes and Long Term Support Haskell

[evan@evan-borden.com]

> I am not against changing the Prelude! But it sure would be nice if
> -XHaskell98 gave me a Haskell 98 Prelude and -XHaskell2010 gave me a
> Haskell 2010 Prelude, both of which could be used with external packages
> that themselves used the more modern Prelude.
>

This sounds like quite a herculean task. Changes in base type-classes would
wreak havoc between preludes from differing timelines.
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