[issue25869] Faster ElementTree deepcopying

[Roundup Robot]

Roundup Robot added the comment:

New changeset 090c3e3a648d by Serhiy Storchaka in branch 'default':
Issue #25869: Optimized deepcopying ElementTree; it is now 20 times faster.
https://hg.python.org/cpython/rev/090c3e3a648d

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nosy: +python-dev

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