enumerate trap invariants

Raul-Sebastian Mihăilă raul.mihaila at gmail.com
Sun Aug 23 19:39:54 UTC 2015

What is the reason for not enforcing invariants on the enumerate trap with
respect to non-configurable, enumerable, own properties of (non-extensible)
targets? More explicit: why is there no error thrown if such a property is
not yielded by the iterator that is returned from the enumerate trap? Is it

Thank you.
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