Why is_integral_v

I guess the title of the question does not make much of a sense, but I hope the problem description will spread the light.
Can someone please explain how on earth this is passing the compilation?

template<typename Cont, typename = std::enable_if<std::is_integral_v<std::string>>>
void print(const Cont& cont) 
{
    for (const auto it : cont) {
        cout << it << " ";
    }
    cout << endl;
}

int main()
{
    std::vector<string> V;
    print(V);
}

The original version was:
template<typename Cont, typename = std::enable_if<std::is_integral_v<typename Cont::value_type>>>
I just explicitly put std::string to be sure.

I guess the enable_if should forbid this function to be instantiated at all right??
What am I missing here?