[Haskell-cafe] Is there a library that has a strict version of `sum`?

[Damian Nadales]

I thought the answer would be easy to find on the internet, but I cannot
find any package that features a strict version of `sum`.

Do you know if such a function is defined anywhere? (like a custom prelude
for instance)

I know it is trivial to define, but I would prefer not to repeat myself
(and somebody else).

Thanks!
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