[ANN] Clojure 1.9.0-beta2

[Alex Miller]

Clojure 1.9.0-beta2 is now available.

Try it via

- Download: https://repo1.maven.org/maven2/org/clojure/clojure/1.9.0-beta2

- Leiningen: [org.clojure/clojure "1.9.0-beta2"]

1.9.0-beta2 includes the following changes since 1.9.0-beta1:

- CLJ-700 - (fix) `contains?`, `get`, and `find` broken for transient collections

- CLJ-2247 - (regression) restore and doc last match semantics of {min,max}-key

- CLJ-2239 - (regression) fix Guava javadoc location

- Updated dep to spec.alpha 0.1.134 - see changes

We would appreciate anything you can do to try out this release. We do not plan to make any further changes prior to 1.9.0 release unless regressions are found.

[Michiel Borkent]

Our tests are passing. Good luck bringing Clojure 1.9.0 out to the world!

[Sophia Gold]

Thanks, Alex! 

I particularly appreciate the work on CLJ-700 as it's been a problem for me for some time. I see on Jira you mentioned it breaking several contrib libraries. I've noticed this for data.avl, to my knowledge the only library that provides transient sorted-maps. 

Would you mind summarizing the decision you guys came to for that? If I'm reading the ticket correctly, it seems the concrete interfaces weren't changed and now implement ITransientAssociative2 as well as ITransientAssociative. Do I just need to build data.avl with the new beta (and/or submit a Jira ticket to update it officially) since the version on Maven uses 1.9.0-alpha14?

Best,

Sophia

[Alex Miller]

Any external data structure libs will need to be updated to implement ITransientAssociative2 for their transient impls to take advantage of the RT changes in 1.9.0-beta2 for CLJ-700. So external libs will not automatically work any differently until those changes are made.

[Sophia]

Gotcha. Are all relevant contrib libraries already planned to be updated when you release 1.9? I'm not sure if there's a policy on breaking changes in contrib libraries, or if this even counts as a breaking change. I use both data.avl and data.int-map enough I'd be willing to submit patches (at some point...just started a new job) if neither their creators nor anyone on the core team is planning on it.

On Sat, Oct 7, 2017 at 11:29 PM, Alex Miller <al...@puredanger.com> wrote:

Any external data structure libs will need to be updated to implement ITransientAssociative2 for their transient impls to take advantage of the RT changes in 1.9.0-beta2 for CLJ-700. So external libs will not automatically work any differently until those changes are made.

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[Alex Miller]

> On Oct 7, 2017, at 10:42 PM, Sophia <sophia...@gmail.com> wrote:
>
> Gotcha. Are all relevant contrib libraries already planned to be updated when you release 1.9? I'm not sure if there's a policy on breaking changes in contrib libraries, or if this even counts as a breaking change. I use both data.avl and data.int-map enough I'd be willing to submit patches (at some point...just started a new job) if neither their creators nor anyone on the core team is planning on it.

It's not a breaking change and the contrib libraries will be updated when the library maintainers decide to do so. I'm sure patches would be welcome in jira for both projects.