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If this were built on top of Node instead of JavaScriptCore, wouldn't a lot of the host integration come for free? Is there a benefit that building on JavaScriptCore yields?

Of course, being a fun project to work on is benefit enough. Just trying to make sure I'm not missing something.

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This is an extension of Ambly [0], which is basically the same thing but for iOS. I believe Ambly was developed because Clojurescript's startup time makes it more practical than clojure on a mobile device. David Nolen has posted benchmarks showing jsc runs clojurescript faster than v8 but I don't believe that was the primary motivation here.

[0] https://github.com/omcljs/ambly

Planck’s main benefits compared to Node.js seem to be the fast startup time for small bash-like scripts, and the potential to be embedded in C-based apps: https://gist.github.com/mfikes/c7da1e7dfded26c7ceb9

Agreed. One interesting direction the project could go in is building as a framework to be embeddable into OS X apps. Cocoa already makes it trivial to expose Objective-C objects to JSC. This would just extend that to being able to script Cocoa apps in Clojure(Script).

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