I will say every programming language I’ve used, I’ve had to worry about overflow. That’s just been a fact of life for me. My guess it’s a speed thing. If the compiler doesn’t need to worry about overflow it can perform the calculations faster. If it handles overflow then all calculations get slower. So it’s a trade off between safety and speed. Julia choose speed over safety, and quite frankly if it used computational safety over speed, I would probably be using another language. 
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