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We should make the specification clear about that, once IDL makes it clear how we should be clear about that.
Do you mean childNodes?
https://github.com/whatwg/dom/commit/92b60a5b88cd580177c47b2d8a2c7ef9f7e8923a Leaving open to create a better fix once IDL is fixed.
https://github.com/whatwg/dom/commit/8a4c69507e25d1b59942da83503b72f862a19ae0