[issue42409] Interpreter exit blocks waiting for ThreadPoolExecutor.map

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[issue42409] Interpreter exit blocks waiting for ThreadPoolExecutor.map

New submission from George Sakkis : ThreadPoolExecutor.map() prevents interpreter exit if there is a reference to the generator it returns. In the attached script: - `python threadpool_map.py run1` exits as soon as the exception is raised on the main thread. This is the desired behavior in ou