I know there's been some discussion about letting users select the deriving mechanism they want, but I'd like to propose a separate tweak to the defaults. Specifically, it's annoying to have to use three pragmas to let me write
newtype Foo f a = Foo (f a) deriving (Functor, Foldable, Traversable) data Bar f a = Bar (f a) deriving (Functor, Foldable, Traversable) and more annoying still that I'll end up with Foldable and Functor instances for Foo that may be much worse than GND-derived ones. The tweaks I'm after: 1. Prefer GND to the built-in derivations for Functor and Foldable, and probably also Eq and Ord. 2. Make DeriveTraversable imply DeriveFunctor and DeriveFoldable.
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