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By "real", I mean native and multi-core. Does that exist now? I think it exists in JRuby, but in MRI?

MRI has native threads a GIL, but you can already release the GIL and run freely in native extensions.

And this is _not_ a property of native vs. green threading. (And shows how shallow the comparison is, given the number of languages that implement green threads mapped to native threads nowadays.)

All major Ruby implementations use OS threads, but the GIL still limits parallelism in MRI.

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