Oh right --- instead of making a new exception type, it's possible to
use `require/typed` to give `raise` a different type signature:
(raise (All (A) (-> Any A))))
(with-handlers ((vector? values))
(raise (vector 1 2 3)))
;; '#(1 2 3)
[[ any-wrap/c is the contract for the `Any` type ]]
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