I’m a pretty heavy user of spec including a lot of coercion. The way I’ve
always done coercion is to enumerate all accepted shapes first and do coercion
last. For your example this would be:
(s/def ::foo (s/and (s/or :string string?
:kw keyword?)
(s/conformer (fn [[tag x]]
(case tag
:string (keyword x)
x)))))
Ps. also don’t forget s/conformer can return :s/invalid to signal failure.
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