Right. The original commenter already seemed to understand that. It's a new issue because the reference count needs locking, whereas previously it didn't becau

Right. The original commenter already seemed to understand that. It's a new issue because the reference count needs locking, whereas previously it didn't because it was implicitly synchronised due to the GIL being locked. But the original commenter asked: hang on, I thought the GIL wasn't locked for numpy? Now you have reached the start of the conversation.