gh-151593: Avoid deadlock in insert_split_key().#152133
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We must not acquire other locks while holding the LOCK_KEYS() mutex. This issue is fixed by calling PyType_Modifed() after releasing the mutex.
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We must not acquire other locks while holding the LOCK_KEYS() mutex. This issue is fixed by calling PyType_Modifed() after releasing the mutex.
Note: this PR was assisted by Claude Opus 4.8.