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Any idea why they decided to write their own JITed python implementation rather than putting in additional support for PyPy ?

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According to this slide their "real world" tests of PyPy didn't live up to the benchmarks, and in fact showed "no clear improvement" compare with cpython

http://www.slideshare.net/KevinModzelewski/pyston-talk-11101...

C-API compatibility, I'm guessing. I agree it was of a strange choice though.

PyPy also has higher memory usage.

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