Thanks for the link Alex. I understand what changed, but I still don't 
understand why. Could you elaborate on the thought that went into this? 
Thank you. 

On Wednesday, June 15, 2016 at 7:37:52 PM UTC-4, Alex Miller wrote:
>
> Check out the thread at 
> https://groups.google.com/forum/m/#!topic/clojure/RLQBFJ0vGG4
>
> On Jun 15, 2016, at 5:22 PM, adrian...@mail.yu.edu <javascript:> wrote:
>
> 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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