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This PR may be premature, so I'm happy to let it sit for a bit. But, the basic idea is that:
Tagged
types are strictly more powerful thanOpaque
ones, thanks to their ability to more naturally support multiple tags.Opaque
has always been misnamed (since the underlying, untagged type isn't hidden at all, which is a critical property of opaque types in other languages).Opaque
andUnwrapOpaque
should be removed.