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gh-114763: Protect lazy loading modules from attribute access races (GH-114781) Setting the __class__ attribute of a lazy-loading module to ModuleType enables other threads to attempt to access attributes before the loading is complete. Now that is protected by a lock. (cherry picked from commit 200271c61db44d90759f8a8934949aefd72d5724) Co-authored-by: Chris Markiewicz <effigies@gmail.com>