Wrapper around match.arg that defaults to ignoring case and trimming white space
match_arg(arg, choices, multiple = FALSE, ignore_case = TRUE, trim_ws = TRUE)
a character vector (of length one unless several.ok is TRUE) or NULL
a character vector of candidate values
logical specifying if arg should be allowed to have more than one element. Defaults to FALSE
logical indicating whether to ignore capitalization. Defaults to TRUE
logical indicating whether to trim surrounding white space. Defaults to TRUE
Value(s) matched via partial matching.