[3.14] gh-142495: Make defaultdict keep existed value when racing with __missing__ (GH-142668)
#142832
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…th `__missing__` (pythonGH-142668) (cherry picked from commit a043407) Co-authored-by: Edward Xu <xuxiangad@gmail.com>
This was referenced Dec 16, 2025
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(cherry picked from commit a043407)
Co-authored-by: Edward Xu xuxiangad@gmail.com