Changing the `Binary` instance for `Double` and `Float`

jaror: > 8x speed up That’s an incredibly specific (and short) case, for an apples-to-apples comparison you need to remove unnecessary laziness from the original. Also I have no idea why it stores data in cons-lists. jaror: > I think it should be possible to write a more efficient package And I think there shouldn’t be just one package, there should be a solid default choice that balances power and efficiency, and a bunch of faster libraries that sacrifice power.