Split function argument conventions
sf_args(trim, label, first)No return value.
(flag)
whether splits corresponding with 0 observations should be kept when tabulating.
(string)
a label (not to be confused with the name) for the object/structure.
(flag)
whether the created split level should be placed first in the levels (TRUE) or
last (FALSE, the default).
Other conventions:
compat_args(),
constr_args(),
gen_args(),
lyt_args()