Prefer Foldable and Traversable classes to List stuff in BasicPrelude about basic-prelude HOT 5 CLOSED

I actually think we shouldn't worry about this until 0.3. Let's release what we've got and then consider this.

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I agree on holding off till 0.3. I'm tempted to say we shouldn't do this, as I'd be afraid that we'll be venturing into the space of "too beginner unfriendly", but I don't have any strong opinion.

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Let's plan on not doing this unless we get significant feedback supporting it; I proposed it hesitantly, so I think we both have the same temptation to lean away from this change.

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For me, CorePrelude would be the perfect prelude if it would contain Foldable and Traversable. You could always restrict some functions to lists in BasicPrelude if you want, but I don't think Foldable and Traversable are beginner unfriendly actually.

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Now that normal Prelude is doing this, I think BasicPrelude should. Like @sjoerdvisscher, BasicPrelude would be the perfect prelude for me if it would contain Foldable and Traversable

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