cinder team member here - we are putting a lot of work into having cinder converge with rather than diverge from mainline cpython. the main idea is to get support for pluggable JITs into cpython, and then have cinder use those APIs to work as a regular extension module.
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Meta does some work for this with Cinder, but Meta has a history of language forks, and it's far enough off the beaten track that I wouldn't use it.
cinder team member here - we are putting a lot of work into having cinder converge with rather than diverge from mainline cpython. the main idea is to get support for pluggable JITs into cpython, and then have cinder use those APIs to work as a regular extension module.