A Variable-argument role is the intended use of an argument of a indicator
function – an argument that refers variables.
In general for the table .variable_arg_roles, the suffix _var means one
while _vars means more than one. The default sets of arguments
for util_correct_variable_use/util_correct_variable_use2 are defined
from the point of usage, e.g. if it could be, that NAs are in
the list of variable names, the function should be able to remove certain
from the output and not disallow them by setting
An object of class
tbl_df (inherits from
data.frame) with 14 rows and 7 columns.
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