code: function (value) {
              var _index = this._values.indexOf(value);
              if (_index > -1 && _index <= this._values.length) {
                  this._values.splice(_index, 1);
              }
              return this;
          }
docs: Deletes a value from Set.
  @method sjl.stdlib.SjlSet#delete
  @param value {*}
  @returns {sjl.stdlib.SjlSet}