Add some (mostly trivial) Duoidal instances #8
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Many are isomorphic to `Identity` (and `Identity` is itself a new instance), but there is also a `Const` instance that additionally serves as justification for the particular representation we use (two distinct newtypes).
Very cursory, but at least noting that it exists.
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Many are isomorphic to
Identity(andIdentityis itself a new instance), but there is also aConstinstance that additionally serves as justification for the particular representation we use (two distinct newtypes).