Should we reexport 'Solo' from 'Data.Tuple'? #406

base-4.16 started to reexport the unary tuple type Solo from the Data.Tuple module. A data type like this one is helpful in various library. I'm usually using Only from the Only package in libraries like postgresql-simple.

• https://hackage.haskell.org/package/Only

Key differences between Solo and Only:

• Different names
• Solo is data and Only is newtype (I see this as a drawback of Solo)
• Solo is available without extra dependencies but only since GHC-9.2

It's not clear to me whether we should reexport Solo. I believe, all other libraries will continue to use Only as there's no benefit in switching to Solo. But still, maybe there're use cases I'm not aware of 🙂