Johan/intl datetimeformatoptions #38521
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Fixes #35865: Missing specific types in DateTimeFormatOptions.
This narrows the type info for
Intl.DateTimeFormatOptions
to legal inputs.Existing code passing options satisfying the former (overly-lax) types in shipping typescript (and which browsers would thus throw a run-time
RangeError
exception for), will now be flagged as typescript compile-time errors, instead.