It's good this will be added (no reason not to) but I'll note that is much less of a requirement to even use the arguments object at all, especially iteration use cases that are pretty much filled by rest. In fact (almost?) the only place I've actually referenced the arguments object is to count the number of arguments to differentiate between deliberate undefined and a missing argument (and only for that use in order to match the behavior of how js engines treat the arguments to some string built-ins).
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