docs: function () {
              return [
                          __.filter (123, _.constant (456)).assert (456),
                          __.filter (['foo', 456], _.isString).assert (['foo']),
                          __.filter (['foo', 456], __.constant ('baz')).assert (['baz', 'baz']),
                          __.filter ({ foo: 123, bar: '456' }, _.isNumber).assert ({ foo: 123 })
                      ] }