It's about all potential routes through. Rather than specific routes. If you wanted to get 100% code coverage you would need to cover every possible route, this is what the complexity of trying to convey.
I'm not sure what you mean by potential vs. specific routes.
I think you're trying to say that it's either in the if or else statement. So there are two specific routes through. But those two routes vary massively depending on which it goes into. The metric doesn't gauge which is more likely or weight them accordingly. I agree It's definitely not perfect, the reverse piece in the additional reading section defines it's pitfalls well.
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