• fix: dayOfWeek/yearOfWeek/weekOfYear incorrectly using local time (#26, #27)
• fix: Compliant string-level normalization of time zone IDs (mentioned in #3)
• fix: DateTimeFormat constructor cannot be invoked without new (#25)
• fix: DateTimeFormat::format correctly implemented as bound getter
• fix: Duration::toLocaleString falls back to toString
• feature: better tree-shakability for ESM