Hello,
Even after reading carefully the official spec guide and testing in the
REPL, I'm not sure I'm `spec`'ing correctly a function that accepts
optional keyword args.
Here's how I do it in a dumb example :
```
(require '[clojure.spec.alpha :as s])
(defn adder [a b & {:keys [c] :or {c 1}}]
(+ a b c))
(s/def ::a integer?)
(s/def ::b integer?)
(s/def ::c integer?)
(s/fdef adder
:args (s/cat :a integer? :b integer? (s/? (s/keys* :opt-un
[::c])))
:ret string?)
```
Is this correct ?
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