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The eraYear accessor property of Temporal.PlainDateTime instances returns a non-negative integer representing the year of this date within the era, or undefined if the calendar does not use eras (e.g., ISO 8601). The year index usually starts from 1 (more common) or 0, and years in an era can decrease with time (e.g., Gregorian BCE). era and eraYear together uniquely identify a year in a calendar, in the same way that year does. It is calendar-dependent.

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The BigUint64Array() constructor creates BigUint64Array objects. The contents are initialized to 0n unless initialization data is explicitly provided.

The dayOfWeek accessor property of Temporal.PlainDateTime instances returns a positive integer representing the 1-based day index in the week of this date. Days in a week are numbered sequentially from 1 to daysInWeek, with each number mapping to its name. It is calendar-dependent.

The [Symbol.asyncDispose]() method of AsyncIterator instances implements the async disposable protocol and allows it to be disposed when used with await using. It calls and awaits the return() method of this, if it exists.

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