C ++中的auto关键字

Question

为什么C ++编译器不会猜测它是initializer_list而不是int？＆gt;

#include <iostream>
#include <typeinfo>

int main() {
    auto f = 45; // int, fine.
    auto li {12,2,54,65}; // initializer_list, as expected/
    auto A{12};  // ????
    std::cout<<typeid(A).name()<<std::endl;
    return 0;
}