What is extra frustrating is that this is an answer StackOverflow. The whole point is to give clear, educational explanations. Well, the solution is only 21 lines, so why not explain the code snippet instead?

    (function() {
      function buggy() {
        function detect() {
          var a = [0, 1];
          a.reverse();
          return a[0] === 0;
        }
        return detect() || detect();
      }
      if(!buggy()) return;
      Array.prototype._reverse = Array.prototype.reverse;
      Array.prototype.reverse = function reverse() {
        if (Array.isArray(this)) this.length = this.length;
        return Array.prototype._reverse.call(this);
      }
      var nonenum = {enumerable: false};
      Object.defineProperties(Array.prototype, {
        _reverse: nonenum,
        reverse: nonenum,
      });
    })();

Look at how elaborate the repo is by comparison:

https://github.com/fanmingfei/array-reverse-ios12