human_numbers defines the method #to_english on the classes Float and Integer, as well as the method #to_french on the Integer class, for converting numbers to natural language strings. By default, a cardinal number will be returned (one, two, three), but supplying an :ordinal argument will cause it to return an ordinal (first, second, third). It works with numbers whose absolute value is less than 10^33. #to_french supports a second argument for specifying the gender of the word, which can be either :masculine or :feminine.