I find this to be a bit strange. Is there any difference that warrants one being re-exported but not the other, or was this an oversight?

Edit: this change appears to have been made in #131: https://github.com/purescript/purescript-foldable-traversable/pull/131/files#diff-4f5e121551e9770d2d2d5b35e21259033cc208f148e65fb21fc5ca87a3ecd0b3L15. product was the only function to be removed from the re-exports, so I think this was an actual oversight.

Edit 2: actually, this was removed because of an import of another, different product: https://github.com/purescript/purescript-foldable-traversable/pull/131/files#diff-4f5e121551e9770d2d2d5b35e21259033cc208f148e65fb21fc5ca87a3ecd0b3R22