es6-fd-block-scoping.js

(function () {
  var g, h;
  function x() { f = ""; /* var-scoped f gets value "" */ }
  function y() { g = f; /* g gets value of var-scoped f */ }
  {
    /* var-scoped f is undefined, let-scoped f is a function */
    h = f; /* h gets value of let-scoped f, a function */
    f = 1; /* let-scoped f gets value 1 */
    x();
    y();
    function f() {} /* var-scoped f gets value of let-scoped f, a number */
  }
  return [typeof f /* number */, typeof g /* string */, typeof h /* function */];
})();

You are completely right. I made a mistake, then checked my answer against Chakra, who's supposed to have done this correctly, and got the same answer. I've updated the example to be clearer (and hopefully right this time!), based on your fork. ❤️ Thanks, Kevin.