[issue45020] Freeze all modules imported during startup.

[Christian Heimes]

Change by Christian Heimes <lists at cheimes.de>:


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nosy: +christian.heimes, christian.heimes, christian.heimes
nosy_count: 24.0 -> 25.0
pull_requests: +27992, 27993, 27994
pull_request: https://github.com/python/cpython/pull/29755

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue45020>
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