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Re:Pyre: Fast Type Checking for Python by ben509 on Friday May 11, 2018 @12:27PM (#17048639)
They didn't start entirely from scratch, they've been doing this with PHP already:

> Internally, Pyre's high-level architecture is similar to that of Hack, Facebook's type checker for PHP.

If they had a performant codebase to start with, this makes a lot of sense.

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