assert(canonicalizedTags[tag].indexOf(locale)!==-1||locale===defaultLocale,"For "+tag+" got "+locale+"; expected one of "+canonicalizedTags[tag].join(", ")+".");
assert(canonicalizedTags[tag].indexOf(locale)!==-1||locale===defaultLocale,"For "+tag+" got "+locale+"; expected one of "+canonicalizedTags[tag].join(", ")+".");