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Maybe because there's already a ton of working ruby implementations that all have their own sets of advantages. There's rubinous (which you named), they seem to be making pretty nice progress, there's mri, ree, maglev, macruby, ironruby and finally there's jruby which is actually often the fastest ruby interpreter around.

It came a bit as a surprise to me that the author mentions jython as an example that languages on the hotspot vm don't benefit too much from its features - jruby certainly does.

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