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In general, it's nice to have the following 4 checks:
* multiprocessing.process._dangling
* asyncio.events._event_loop_policy
* urllib.requests._url_tempfiles
* urllib.requests._opener
The problem is that because of these checks, **any** unit test file of the 424 Python test files import asyncio, multiprocessing and urllib. As a result, **any** unit test starts with around 233 imported modules. We are far from an "unit" test, since many modules have side effects.
I wrote PR 22089 to remove these checks. "import test.libregrtest" is reduces from 233 to only 149 imports (on Linux), which is way better.