Uses Intl.PluralRules (CLDR plural rules as shipped with ICU) to get the cardina...
https://text.halowerk.com/v1/plural-rules-checkOverview
Uses Intl.PluralRules (CLDR plural rules as shipped with ICU) to get the cardinal and ordinal categories of the locale with sample numbers. ICU MessageFormat messages are parsed with a full parser; for every plural or selectordinal argument it reports missing categories, categories the locale never uses, explicit =N cases and the required other branch.