[issue41431] Optimize dict_merge for copy

[Inada Naoki]

Inada Naoki <songofacandy at gmail.com> added the comment:


New changeset db6d9a50cee92c0ded7c5cb87331c5f0b1008698 by Inada Naoki in branch 'master':
bpo-41431: Optimize dict_merge for copy (GH-21674)
https://github.com/python/cpython/commit/db6d9a50cee92c0ded7c5cb87331c5f0b1008698


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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue41431>
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