Thanks for the update, this seems like a good decision allowing things to 
evolve more quickly.
Does that also mean that there are no breaking changes intended to current 
non .alpha namespaces/APIs? 

Kind regards,
 Leon

On Wednesday, April 26, 2017 at 5:30:56 PM UTC+2, Alex Miller wrote:
>
> We are moving spec out of the Clojure repo/artifact and into a library to 
> make it easier to evolve spec independently from Clojure. While we consider 
> spec to be an essential part of Clojure 1.9, there are a number of design 
> concerns to resolve before it can be finalized. This allows us to move 
> towards a production Clojure release (1.9) that depends on an alpha version 
> of spec. Users can also pick up newer versions of the spec alpha library as 
> desired. Additionally, this is a first step towards increased support for 
> leveraging dependencies within Clojure.
>
>
> We will be creating two new contrib libraries that will contain the 
> following (renamed) namespaces:
>
>
> *org.clojure/spec.alpha*
>     clojure.spec.alpha          (previously clojure.spec)
>     clojure.spec.gen.alpha      (previously clojure.spec.gen)
>     clojure.spec.test.alpha     (previously clojure.spec.test)
>
>
> *org.clojure/core.specs.alpha*
>     clojure.core.specs.alpha    (previously clojure.core.specs)
>
>
> In most cases, we expect that users have aliased their reference to the 
> spec namespaces and updating to the changed namespaces will only require a 
> single change at the point of the require.
>
>
> *How will ClojureScript's spec implementation change?*
>
>
> ClojureScript will also change namespace names to match Clojure. 
> Eventually, the ClojureScript implementation may move out of ClojureScript 
> and into the spec.alpha library - this is still under discussion.
>
>
> *Why do the libraries and namespaces end in alpha?*
>
>
> The "alpha" indicates that the spec API and implementation is still 
> subject to change.
>
>
> *What will happen when the spec api is no longer considered alpha?*
>
>
> At that point we expect to release a non-alpha version of the spec library 
> (with non-alpha namespaces). Users may immediately begin to use that 
> version of spec along with whatever version of Clojure it depends on. 
> Clojure itself will depend on it at some later point. Timing of all these 
> actions is TBD.
>
>
> *Will the library support Clojure 1.8 or older versions?*
>
>
> No. spec uses new functions in Clojure 1.9 and it has never been a goal to 
> provide spec for older versions. Rather, we are trying to accelerate the 
> release of a stable Clojure 1.9 so that users can migrate forward to a 
> stable production release with access to an alpha version of spec, and 
> access to ongoing updated versions as they become available.
>
>
>

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