Observations: 3
Variables: 9
$ a <dbl> 1.0, 2.5, NA
$ b <int> 1, 2, NA
$ c <lgl> TRUE, FALSE, NA
$ d <chr> "a", "b", NA
$ e <fctr> a, b, NA
$ f <date> 2015-12-10, 2015-12...
$ g <dttm> 2015-12-09 10:51:35...
$ h <list> [1, 2, NA]
$ i <list> [[1, <2, 3>], [<4, ...
