code: function shortOut$1(func) {
    var count = 0,
        lastCalled = 0;
  
    return function () {
      var stamp = nativeNow(),
          remaining = HOT_SPAN - (stamp - lastCalled);
  
      lastCalled = stamp;
      if (remaining > 0) {
        if (++count >= HOT_COUNT) {
          return arguments[0];
        }
      } else {
        count = 0;
      }
      return func.apply(undefined, arguments);
    };
  }
docs: Creates a function that'll short out and invoke `identity` instead
  of `func` when it's called `HOT_COUNT` or more times in `HOT_SPAN`
  milliseconds.
  
  @private
  @param {Function} func The function to restrict.
  @returns {Function} Returns the new shortable function.