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add explicit functor from Hask to target category
allows us to have distinct existential and product types, for example
(Extricated from https://kitty-hawk.atlassian.net/browse/SW-1672)
Greg Pfeil January 9, 2021, 3:54 PM IIRC, when I poked at this before, what I really wanted for the implementation was partially-applied type families, which I think are actually coming Real Soon Now?
I don't think unsaturated tyfams are ever coming :(