@maurycy noticed in #137949 that the csv.register_dialect() docstring creates an incorrect impression that the function returns the registered dialect, while it always returns None. Removing ...
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The easiest way to see the carnage in action is to run it under gdb and break on PyInit__multiarray_umath. You'll see it gets called twice, the second time reentrantly (with a 276-frame backtrace ...