Hi!
You assume that cast type hinting will be the implementation chosen. If the type hinting is in fact validation the way object type hinting is (strict type hinting), no conversion takes place, and the meaning is different. I should have said "if strict type hinting is implemented" in the drawback description to make that clear.
If there's only strict typing, there's no reason to make it's syntax to be resembling typecasts.
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