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open union and open product types in Haskell

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subj, I'm looking for a way to compose variants from two different definitions. Is there something similar to https://stackoverflow.com/questions/59495874/creating-a-completely-dependent-concatenation ?

I wonder if it would be a good idea to have a special `Show` instance for `Union Identity`. It could unwrap the `Identity` before using the underlying `Show` instance for...

help wanted
good first issue

It would be interesting to try to emulate [Data.Extensible.Sum](https://hackage.haskell.org/package/extensible-0.4.8/docs/Data-Extensible-Sum.html), with it's use of `MemberShip`.

help wanted