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Title: bpo-41431: Optimize dict_merge for copy by methane · Pull Request #21674 · python/cpython · GitHub

Open Graph Title: bpo-41431: Optimize dict_merge for copy by methane · Pull Request #21674 · python/cpython

X Title: bpo-41431: Optimize dict_merge for copy by methane · Pull Request #21674 · python/cpython

Description: Use clone_combined_dict when possible. https://bugs.python.org/issue41431

Open Graph Description: Use clone_combined_dict when possible. https://bugs.python.org/issue41431

X Description: Use clone_combined_dict when possible. https://bugs.python.org/issue41431

Opengraph URL: https://github.com/python/cpython/pull/21674

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Fast copy should be compact.https://github.com/python/cpython/pull/21674/commits/7a54a9d88d05fe7f913366a230a88316504015f1
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clone only when other is just size.https://github.com/python/cpython/pull/21674/commits/f649b5a402f1648185065f1b405ec8dbe2358eda
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