Add Context instances for Contravariant, Divisible, Decidable #577
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This gives us a few useful new combinators for manipulating
Contexts.Most useful are probably
Which lets you combine two existing contexts to make a context for a pair and
Which lets you write a context for data which might be one of two cases.
I've needed
dividedfor my site, and currently the only way to get it is to peek under the definition ofContext.