adjoin function for Traversals
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This is mostly a translation from adjoin from the haskell lens library: https://hackage.haskell.org/package/lens-5.2/docs/Control-Lens-Unsound.html#v:adjoin TraversableHomogeneousTuple was added as a way to safely traverse the tuple type that `lensProduct` produces. An alternative way should be to use the array Traversable, but that requires casting in order for typescript to accept that.
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This adds an
adjoinfunction for Traversals, that combines two Traversals into one.I could only do that by more or less translating the version from the haskell lens library.
For this reason the
partsOfandproductfunctions also come with it.I was not sure how to best traverse the tuple type returned by
product. I added a newTraversableinstance for thereadonly [A, A]type, though it doesn't look like that's the correct way to build that traverse function. Let me know what a better approach for this is.