code: function cloneSet(set, isDeep, cloneFunc) {
      var array = isDeep ? cloneFunc(setToArray(set), true) : setToArray(set);
      return arrayReduce(array, addSetEntry, new set.constructor());
    }
docs: Creates a clone of `set`.
  
  @private
  @param {Object} set The set to clone.
  @param {Function} cloneFunc The function to clone values.
  @param {boolean} [isDeep] Specify a deep clone.
  @returns {Object} Returns the cloned set.