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> between Groovy, Clojure and Scala there's something to suit most programming tastes

> the spec for the JVM is in one place, and it's published

Between Groovy, Clojure and Scala, there's something to suit most tastes on the scale of how much language specification there is. Scala has a published spec (along with many white papers on the R.I. internals), Clojure has its published spec in the comments in the source code, and Groovy actively changes the spec between versions to prevent addons and alternative implementations being built.

Sure, and I'd prefer people used the more specified options. But even if you have a Groovy library that you can't compile under modern Groovy, the bytecode will still run on new JVMs - more than you can say in the Docker case.

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