[Haskell-cafe] Quickcheck, Arbitrary and Overlapping instances

[Valentin Robert]

I think it is one case where you should use newtype instead of type, so that 
it is not just a simple type synonym, but an actual "other" type.

With type, you're just making an alias, but Haskell sees the same type. A 
newtype wrapper will hide this, at the price of having to define a (unique) 
constructor... So yes, you'll have to change some code.
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