[issue30365] Backport warnings in ElementTree/cElementTree modules and fix bugs

[Stefan Behnel]

Stefan Behnel added the comment:

Looks good to me (didn't test it).

Note that getchildren() is not deprecated in lxml because it's actually the fastest way to build a list of the children. It's faster than list(element) because it avoids the Python (C-level) iteration overhead. However, that probably wouldn't be substantial enough to merit adding it if it wasn't there already. I'm ok with deprecating the method in ET. It's redundant there.

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