I was wondering if you could shed some light on why instrument was changed 
to not automatically check the :ret and :fn specs. I miss that feature 
already, hehe, although I understand that these are alpha versions and 
things evolve. :) I just want to understand the context behind this 
decision. If I missed relevant discussion already explaining this, I 
apologize. 

On Tuesday, June 14, 2016 at 1:31:25 PM UTC-4, Alex Miller wrote:
>
> Clojure 1.9.0-alpha6 is now available.
>
> Try it via
>
> - Download: 
> https://repo1.maven.org/maven2/org/clojure/clojure/1.9.0-alpha6
> - Leiningen: [org.clojure/clojure "1.9.0-alpha6"]
>
> 1.9.0-alpha6 includes the following changes since 1.9.0-alpha5:
>
> - & regex op now fails fast when regex passes but preds do not
> - returns from alt/or are now map entries (supporting key/val) rather than 
> 2-element vector
> - [BREAKING] fn-specs was renamed to fn-spec and returns either the 
> registered fspec or nil
> - fspec now accepts ifn?, not fn?
> - fspec impl supports keyword lookup of its :args, :ret, and :fn specs
> - fix fspec describe which was missing keys and improve describe of 
> :args/ret/fn specs
> - instrument now checks *only* the :args spec of a var - use the 
> clojure.spec.test functions to test :ret and :fn specs
> - Added generator support for bytes? and uri? which were accidentally left 
> out in alpha5
>
>

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