The `locales` parameter of `DateTimeFormat` and `NumberFormat` should be optional
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OndrejSpanel commented
MDN says:
Locale identification and negotiation
The locales argument must be either a string holding a BCP 47 language tag, or an array of such language tags. If the locales argument is not provided or is undefined, the runtime's default locale is used.
And
new Intl.DateTimeFormat([locales[, options]])
Intl.DateTimeFormat.call(this[, locales[, options]])
Current signature of DateTimeFormat and NumberFormat is:
class DateTimeFormat(locales: String | js.Array[String],
In comparison. for Collator it is:
class Collator(locales: js.UndefOr[String | js.Array[String]] = js.undefined,
I think the same locales parameter type should be used for DateTimeFormat and NumberFormat.