Heterogeneous equality into base?

[Ryan Scott]

I also agree that we should keep HRefl a distinct name, and moreover, we
should keep :~: and :~~: as distinct datatypes.

I'm also on-board with the idea that we should introduce a separate
Data.Type.Equality.Hetero module that reexports :~~: and defines
heterogeneous counterparts for sym, trans, etc. from Data.Type.Equality. I
don't have a strong opinion on how they should be named (e.g., sym vs.
hsym).

Ryan S.
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