code: function sortedLastIndexBy(array, value, iteratee) {
          return baseSortedIndexBy(array, value, getIteratee(iteratee), true);
        }
docs: This method is like `_.sortedLastIndex` except that it accepts `iteratee`
  which is invoked for `value` and each element of `array` to compute their
  sort ranking. The iteratee is invoked with one argument: (value).
  
  @static
  @memberOf _
  @category Array
  @param {Array} array The sorted array to inspect.
  @param {*} value The value to evaluate.
  @param {Function|Object|string} [iteratee=_.identity] The iteratee invoked per element.
  @returns {number} Returns the index at which `value` should be inserted into `array`.
  @example
  
  // The `_.property` iteratee shorthand.
  _.sortedLastIndexBy([{ 'x': 4 }, { 'x': 5 }], { 'x': 4 }, 'x');
  // => 1