The best you can do is `someNatVal`:

case someNatVal 10 of
  Just (SomeNat p) -> _ {- do stuff with p -}
  _ -> _ {- not a nat -}

I’d like to use Data.Vector.Sized.slice’, but it wants the starting position and length parameters as Proxys, not Integers.
How can I convert an Integer into a Proxy (n :: KnownNat) with n equal to the integer?

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