"(...). As for Unladen Swallow, there are some reasons to think that LLVM has matured greatly in the past few years, particularly in the JIT engine which has been completely replaced. I'm not sure if that's the only part to the story; I'd be interested in talking with any of the people who were involved or knowledgeable about the project."
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From Dropbox to the python-dev mailing list:
"(...). As for Unladen Swallow, there are some reasons to think that LLVM has matured greatly in the past few years, particularly in the JIT engine which has been completely replaced. I'm not sure if that's the only part to the story; I'd be interested in talking with any of the people who were involved or knowledgeable about the project."