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Dart's default sort is not stable either.

That's probably on me...

If I had to do it again, I would make it stable now.

Luckily this is a backwards-compatible change so sorokod should lobby the Dart team.

Is it though? Or is Dart-Js not a thing any more?

Dart2JS is still a thing, but sort in JS is stable now since 2019 so DartVM should make theirs stable to stay compatible with Dart2JS.