TIL TheDailyWTF is still active. I'd thought it had settled to greatest hits only some years ago.
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It's worth noting that there was one developer who wrote all of this code. They left AECL in 1986, and thankfully for them, no one has ever revealed their identity. And while it may be tempting to lay the blame at their feet—they made every technical choice, they coded every bug—it would be wildly unfair to do that.
It's interesting, because all the older works in its training data will default to the masculine singular, and that has to be a massive number of books too. But maybe the modern writing, including lots of online sources, simply overwhelms that. Or it's one of the guardrails written into the AIs to avoid offending people.