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gh-148801: Fix unbound C recursion in `Element.deepcopy()` (#148802)

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Tests on: push 19

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[main]: gh-148801: Fix unbound C recursion in `Element.__deepcopy__()` (#148802) on: dynamic

prebuild

[main]: gh-148801: Fix unbound C recursion in `Element.__deepcopy__()` (#148802) on: dynamic

prebuild

CodeQL on: dynamic 4

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Analyze (c-cpp)

Analyze (javascript-typescript)

Analyze (python)

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Failed to upload debug artifacts: Error: File /home/runner/work/_temp/proxy.log does not exist

Analyze (javascript-typescript)

succeeded Apr 21, 2026 in 1m 58s

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gh-148801: Fix unbound C recursion in `Element.__deepcopy__()` (#148802)

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gh-148801: Fix unbound C recursion in `Element.deepcopy()` (#148802)