[dwattttt]

To elaborate on siblings compile time vs run time answer: if it fails at compile time you'll know it's a problem, and then have the choice to not enforce that check there.

If it fails at run time, it could be the reason you get paged at 1am because everything's broken.

[jb1991]

It’s not just about safety, it’s also about speed. For many applications, having to check the values during runtime constantly is a bottleneck they do not want.