"It seems when iterating over values, the refcount of the current element is incremented, but all other elements keep their refcounts unchanged. Therefore, iterating over something doesn't prevent non-current elements from destruction."
That seems like a good feature instead of a problem. If an element disappears I want to know about it. If I don't care if it disappears I can make copies of the elements beforehand. To me the problem seems to be that the deleted element can erroneously reappear as something else if it's memory location is reused. For hashes this can be avoided by iterating over keys and checking if the key still exists when it is to be used.

In reply to Re^7: Use of freed value in iteration by Danny
in thread Use of freed value in iteration by js1

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