It can run Javascript with similar peak performance than V8 with a tiny tiny fraction of development than what went into the latter. (Of course it is possible o

It can run Javascript with similar peak performance than V8 with a tiny tiny fraction of development than what went into the latter. (Of course it is possible only due to it leveraging the many many dev-hours spent on the JVM), it is the fastest Ruby implementation by an integer factor and it can run C dependencies (often used by Python/Ruby) as well, and even optimize across language boundaries. The smallish list of languages is just due to lack of effort, plus lack of immediate benefits — it is not hard to create an alternative language implementation. It is very hard to create one that is 100% drop-in replaceable with the real thing as every sufficiently complex program will depend on implementation quirks as well.