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implicit int to double is really, really bad! it can silently truncate - double can only store 53 bits integers so for large integers the result will not be an integer!

in general, lossy conversions should never, ever be implicit

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Great point, I was thinking of ints as 32 bits. You're absolutely correct for 64 bit ints!

I would instead say int should be guaranteed to fit in a double. I feel like there's no reason to introduce a pitfall in > 99.999% of use cases just because there might be some obscure architecture where int is 64-bit and its programmers cannot be bothered with the extra keystroke for 'long'.

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