[3.14] gh-145566: Skip stop-the-world when reassigning __class__ on newly created objects (gh-145567)#145605
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colesbury merged 2 commits intopython:3.14from Mar 6, 2026
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…__` on newly created objects (pythongh-145567) (cherry picked from commit 1d091a3) Co-authored-by: Sam Gross <colesbury@gmail.com>
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(cherry picked from commit 1d091a3)
__class__on a uniquely owned instances #145566