what do I need to do to get fdef to throw errors on invalid return values?

(defn x [] "hello")
(s/fdef x :ret number?)

=> (x)
"hello"

Will instrumenting a multimethod be supported? https://groups.google.com/forum/#!topic/clojure/BBWc3c40RDI

Also, is there a way to require a bunch of same-namespaced keys without specifying the namespace on each one?

Is there a best practice for conformers, like one that can transform a string to java.util.UUID - should I call it ::uuid, ->uuid etc?

@wei not supported. ret and fn specs are checking that a function works, which is seen as a testing time activity supported only by stest/check

@yonatanel: re multimethods, certainly no opposition to it, but needs some work

@yonatanel: re ns keys, use create-ns to create the namespace, then alias to alias it. There is a pending patch to remove the first step.

Re conformers, no convention

@alexmiller what would you recommend for checking inputs at runtime using spec? s/valid? inside of a :pre?

@yonatanel There's a version of alias in https://github.com/gfredericks/schpec that creates the namespace, then aliases to it.

nevermind, figured it out, the guide does mention :pre/:post

what are some tradeoffs between s/check-asserts and :pre/post?

Check-asserts can be turned on and off or even compiled out