universum already reexports Hashable type class. But sometimes you want to implement Hashable instances by your own. In that case you need to
Add hashable package into .cabal dependencies
Add import Data.Hashable (hashWithSalt) in your module.
These steps are really tedious to perform. If instead universum reexports hashWithSalt then there will be no problems. I think it's rather safe to export this function. It's name is rather unambiguous across packages.
universumalready reexportsHashabletype class. But sometimes you want to implementHashableinstances by your own. In that case you need tohashablepackage into.cabaldependenciesimport Data.Hashable (hashWithSalt)in your module.These steps are really tedious to perform. If instead
universumreexportshashWithSaltthen there will be no problems. I think it's rather safe to export this function. It's name is rather unambiguous across packages.