[issue42403] Cleanup importlib code

[STINNER Victor]

New submission from STINNER Victor <vstinner at python.org>:

Placeholder issuer to enhance the importlib code base and "bootstrap" code.

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components: Library (Lib)
messages: 381397
nosy: vstinner
priority: normal
severity: normal
status: open
title: Cleanup importlib code
versions: Python 3.10

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue42403>
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