| any_obj | Validator: Allow any object |
| atm_vec | Validator: Check if element is atomic |
| chr_vec | Validator: Check if element is a character |
| dataclass | Construct a dataclass in R |
| data_validator | Convert a dataclass to a data frame validator |
| df_like | Validator: Check if element is a data like object |
| dte_vec | Validator: Check if element is a date |
| lgl_vec | Validator: Check if element is a logical |
| num_vec | Validator: Check if element is a number |