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by JonCoens 4384 days ago
Our blog post goes into some of this: https://code.facebook.com/posts/302060973291128/open-sourcin...

Interpreted code was no longer cutting it for perf reasons, and any time you create your own language you end up reinventing the entire tool chain (debuggers, profilers, etc.). Haskell provides so much functionality in the language itself and has mature solutions to the other issues plaguing us in FXL, so it was a natural choice.