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Yes. Not only is YJIT directly integrated into CRuby, it's also 100% compatible with your existing Ruby code, which is why we chose to go that route.

We didn't want to independently reimplement Ruby because we knew that this would lead to a situation where we wouldn't be 100% compatible, which would stop people from using YJIT. If you think about PyPy for example, they have great performance numbers, but relatively few people are using it.

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Yeah , it was because Guido himself was not promoting that project . PyPy team really tried hard to be compatible , now almost all c-extensions including DS libraries worked. I am using PyPy in production for 8 years and - it reduce memory load by a lot , ( 80 MB vs over 300 MB for tornado web service running) - it is so much faster than python that is comparable to node in high load peformance. - it would be compatibile with every lib if Main Stream Python community had even tried it and work on it.

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