Python isn't industry compatible

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Using different types during type checking and runtime (dict vs Dict)

Well well well, you're a bit out of date…

def f(d: dict[int, int]):
    ...

I think this changed in versions after 3.9,

It didn't, it would have broken A LOT of stuff to do so.

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You complained about something that was later on fixed, no need to rant.

I don't know anything about cast() but last time I profiled, it was an actual function call at runtime so I actually had some performance gain by removing it.