This function is in experimental development. It currently only supports English cardinal integers or character vectors produced by one of nombre's functions.
A character vector of the cardinal names of numbers
A numeric vector the same length as
NAs will be produced for numbers with fractions or decimals or non-cardinal
numbers (e.g. ordinals).
cardinal() to convert numeric vectors to number names
uncardinal("one") #>  1 uncardinal("negative one hundred fifty-seven") #>  -157 uncardinal( c( "twenty-five", "one million two hundred thirty-four thousand five hundred sixty-seven" ) ) #>  25 1234567 uncardinal("infinity") #>  Inf card <- cardinal(25) uncardinal(card) #>  25 ord <- ordinal(25) uncardinal(ord) #>  25