> This seems very interesting. One question:
>
> > The MonadPlus and the Alternative instance differ: the former's mplus
> > combinator equals the asymmetric <<|> choice.
>
> Why?
>
Good question. Basically, I see MonadPlus as a union of Monad and
Alternative. The class should not exist at all. But as long as it does, I
figured I should provide an instance, and I made it different from the
Monoid+Alternative combination because otherwise it would be useless. My
second choice would be to remove the instance completely.
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