[3.13] gh-142495: Make defaultdict keep existed value when racing with __missing__ (GH-142668)
#142858
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…cing with `__missing__` (pythonGH-142668) (cherry picked from commit a043407) Co-authored-by: Edward Xu <[email protected]>
This was referenced Dec 17, 2025
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(cherry picked from commit a043407)