I can't think of a good reason metatypes couldn't fundamentally be plain old generic types. The generics syntax also makes it even clearer (to my eyes) what Meta<any P> vs. any Meta<P> would mean. It'd be difficult to make something that abstracts over existential metatypes and plain old metatypes because they aren't really structurally similar; the former is more a special case of existential types than a proper metatype.
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