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See https://github.com/tc39/proposal-temporal/pull/2316 which eliminated an observable call to Array.prototype[Symbol.iterator]() in the case where a calendar's 'fields' property was undefined. The best way I've thought of to test this is to monkeypatch the Array.prototype[Symbol.iterator]() method to make it throw. In some cases, where we are actually expected to iterate the return value from a Temporal.TimeZone's getPossibleInstantsFor() method, we have to provide a custom method for that as well, that returns a non-Array iterable so we don't call the patched Array.prototype[Symbol.iterator](). This normative change reached consensus at the July 2022 TC39 plenary meeting.