Delegate review: Specify in which order properties are accessed when passing object to implementation-defined operation #1388
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non-prod-polyfill
THIS POLYFILL IS NOT FOR PRODUCTION USE!
spec-text
Specification text involved
tc39-review
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From #1383. In implementation-defined operations such as non-ISO calendars (e.g. https://tc39.es/proposal-temporal/#sup-temporal.calendar.prototype.datefromfields) it must be specified in which order properties from these objects are accessed. The objects should be copied and objects containing data properties should be passed to the operations, so that getters are not called more than once.
cc @bmeck
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