# A tibble: 3 x 9
      a     b     c     d
  <dbl> <int> <lgl> <chr>
1   1.0     1  TRUE     a
2   2.5     2 FALSE     b
3    NA    NA    NA  <NA>
# ... with 5 more variables:
#   e <fctr>, f <date>,
#   g <dttm>, h <list>,
#   i <list>
