Fix GH-16595: Another UAF in DOM -> cloneNode #16598
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We need to perform all sanity checks before doing any modification. I don't have a reliable and easy test for this on 8.2, but I have one for 8.4.
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We need to perform all sanity checks before doing any modification. I don't have a reliable and easy test for this on 8.2, but I have one for 8.4.