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It would be interesting to know which language the author currently uses.

The author mentions that he was stuck on a problem for weeks using Julia, but solved it with Python within hours

That was someone else: Patrick Kidger is mentioned in the article. If I look at the author's github, it's go and javascript.

You're right. I misread.

Pretty sure it was Go last time I talked to Yuri, he is very much a stand-up guy.