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Re:Back end of Meta Threads is built with Python 3.10 with s... by jgwil2 on Thursday July 06, 2023 @11:06PM (#36626565)
> are they using some subset of the language?

They're using a derived language called Hack.

> Does the compiled code use a garbage collector? Or reference counting?

Not sure but it's open source so I'm sure you can dig up the answers one way or another: https://github.com/facebook/hhvm

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