Intro.

This week there’s a new section, suggested by Colin Taylor: Waiting for 1.9, which highlights JIRA tickets and commits of interest.

Articles.

• The Ultimate Guide To Clojure REPLs, and looking at the table of contents, I don’t think that title is an exaggeration.
• Stuart Sierra’s opinionated ns style guide

Libraries & Books.

• Jake McCrary has released reload, a Ring middleware for reloading your namespaces with clojure.tools.namespace on every request.

People are worried about Types. ?

• Functional Mumbo Jumbo - ADTs by Kris Jenkins
• core.typed now has support for generating specs from unit tests
• clojure.core specs can be consumed by external projects safely

Foundations.

• ObjectLayout, a set of data structures that could be used to support higher performance for object arrays by allocating contiguous memory in a hypothetical future JVM. See also this presentation on it. 
• Project Valhalla, a similar but more ambitious project for value types in Java.
• A mailing list discussion on how these two projects relate, including an excellent reply by Brian Goetz with a 20 year future perspective on Java’s development.

Tools.

• Colin Fleming has released a plugin to compile Clojure with Gradle, if you’re into that kind of thing…

Waiting for 1.9.

• Make clojure spec explain printer pluggable
• It looks like there’s movement on CLJ-700, contains? broken for transient collections
• Not all keywords that can be printed can be read. This comes up now and again, so it’s worth remembering.
• Protocolize CLJS compiler access to the file system

Learning.

• Alex Miller will be teaching a half-day spec workshop

Misc.

• Incidents involving the CA WoSign